Motor Protective Relay K2CM CSM_K2CM_DS_E_6_2 Solid-state Relay Enables Choice of Three Operating Functions (Overcurrent, Open- phase, and Reverse-phase) • Protects 3-phase induction motors and their loads from damage. • Selection and combination of operating functions from overcur- rent, open-phase, and reverse-phase. • Circuit and output relay operation can be checked by just operat- ing the test button. • The set time value can be checked easily because operation time is indicated from the start of operation. • Space-saving, integrated construction. Note: If the K2CM is used with an inverter, the operating conditions will depend on the load wiring length, inverter carrier frequency, basic frequency, and load conditions. Error will occur in the operating values of the overload elements. It is recommended to test operation before using the K2CM. Model Number Structure ■ Model Number Legend K2CM-@@@-@@ 12 3 4 5 6 1. Model 5. Current setting range LS: 2 to 8 A K2CM: Motor relay 2. Mounting style L: 8 to 26 A None: Surface-mounting, integrated type M: 20 to 65 A 3. Operating time characteristics H: 50 to 160 A None: Inverse type 6. Operating time Q: Instantaneous type None: ×1 (2 to 10 s)/ ×4 (8 to 40 s) Switchable 4. Supply voltage of control circuit 7. Resetting method 1: 100/110/120 VAC None: Manual reset 2: 200/220/240 VAC A: Automatic reset 4: 400/440 VAC 8. Reverse-phase detection type None: Current reverse-phase detection V: Voltage reverse-phase detection Ordering Information ■ List of Models Voltage Reverse-phase Detection Models Time specification Inverse type Instantaneous type Resetting Current setting range 8 to 26 A 20 to 65 A 50 to 160 A 8 to 26 A 20 to 65 A 50 to 160 A method Operating voltage Manual 200/220/240 VAC K2CM-2LV K2CM-2MV K2CM-2HV K2CM-Q2LV K2CM-Q2MV K2CM-Q2HV Automatic 200/220/240 VAC K2CM-2LAV K2CM-2MAV K2CM-2HAV K2CM-Q2LAV K2CM-Q2MAV K2CM-Q2HAV 1 K2CM Current Reverse-phase Detection Models Time specification Inverse type Instantaneous type Current setting range 2 to 8 A 8 to 26 A 20 to 65 A 50 to 160 A 2 to 8 A 8 to 26 A 20 to 65 A 50 to 160 A Resetting method Operating voltage Manual 100/110/120 VAC K2CM-1LS K2CM-1L K2CM-1M K2CM-1H K2CM-Q1LS K2CM-Q1L K2CM-Q1M K2CM-Q1H 200/220/240 VAC K2CM-2LS K2CM-2L K2CM-2M K2CM-2H K2CM-Q2LS K2CM-Q2L K2CM-Q2M K2CM-Q2H 400/440 VAC --- K2CM-4L K2CM-4M K2CM-4H --- K2CM-Q4L K2CM-Q4M K2CM-Q4H Automatic 100/110/120 VAC K2CM-1LSA K2CM-1LA K2CM-1MA K2CM-1HA K2CM-Q1LSA K2CM-Q1LA K2CM-Q1MA K2CM-Q1HA (See 200/220/240 VAC K2CM-2LSA K2CM-2LA K2CM-2MA K2CM-2HA K2CM-Q2LSA K2CM-Q2LA K2CM-Q2MA K2CM-Q2HA note.) 400/440 VAC --- K2CM-4LA K2CM-4MA K2CM-4HA --- K2CM-Q4LA K2CM-Q4MA K2CM-Q4HA Note: The manual resetting method must be used with reverse-phase detection. ■ Related Product Transformer Model Voltage specification Secondary power consumption SE-PT400 Primary side 380 to 480 V (wide power supply range) 7VA Secondary side 190 to 240 V (wide power supply range) Note: Use this Transformer when a voltage reverse-phase detection model is used on a 400-V line. Specifications ■ Ratings Other features, such as 100% overcurrent capacity and flush mounting are also available. See Model Number Legend on page 1 for details. Supply voltage of motor circuit 200/220, 400/440 VAC, 50/60 Hz Supply voltage of control circuit 100/110/120, 200/220/240, 400/440 VAC, 50/60 Hz Insulation breakdown of output contact 500 VAC Operating voltage/current of output contact NO contact: 120 VAC/2 A, 240 VAC/1 A, 440 VAC/0.5 A, 110 VDC/0.2 A, 220 VDC/0.1 A (pf = 0.4 when breaking contact) NC contact: 120 VAC/5 A, 240 VAC/2 A, 440 VAC/1 A, 110 VDC/0.2 A, 220 VDC/0.1 A Contact form of output contact Current reverse-phase detection models: SPST-NO + SPST-NC Voltage reverse-phase detection models: SPDT Operating current range of input circuit 2 to 160 A (Number of passes: 1) Operating voltage range of control circuit 85% to 110% of rated voltage, but operates normally at 50% of open-phase supply voltage Operating frequency range of control circuit 95% to 105% of rated frequency Power consumption Approx. 3 VA (in standby state); 5 VA (in operating state) Overcurrent function operating value 115 ±10% of the setting value Overcurrent function operating time setting Inverse Type range Inverse time both at startup and during operation: Timer scale × 1 (s) at 600% overload Timer scale × 3 (s) at 200% overload Note: The above values are for a time factor setting of 1. Instantaneous Type Fixed time at starting (start-up lock) • Time setting value (varies between 2 and 40 s) at 140% overload and starting Instantaneous during operation: 0.5 s max. (when current is increased from 100 to 140% of the set current value) Case color Munsell 5Y7/1 Overcurrent function operating time Inverse type: ±10% of maximum setting value (at 600% overload) characteristics Instantaneous type: ±20% of maximum setting value (at 140% overcurrent and at starting) Overcurrent function resetting value 100% min. of the setting value Overcurrent function start-up operating Inverse type: Not applicable value Instantaneous type: 30% max. of the setting value (See note.) Open-phase operating value 85% max. of the set current value (at open-phase) Open-phase operating time 2 s max. (at overcurrent operating value) Reverse-phase operating value 50% max. of the current value (80% max. of the operating voltage) Reverse-phase operating time 1 s max. (at overcurrent operating value) Imbalance operating value 85% of the set current value Current imbalance factor High: 35 ±10%; Low: 60% min. (at overcurrent operating value) where Reverse phase portion Imbalance factor = × 100 (%) Normal phase portion Note: The start-up lock timer restarts when the operating value at starting becomes less than 30% of the set current value. 2 K2CM ■ Characteristics Variation due to At 20 ±20 °C Overcurrent: ±5% of operating value, ±10% of operating time temperature Open-phase: ±10% of operating value, ±10% of operating time fluctuation Reverse-phase: ±10% of operating value, ±10% of operating time At 20 ±30 °C Overcurrent: ±10% of operating value, ±20% of operating time Open-phase: ±20% of operating value, ±20% of operating time Reverse-phase: ±20% of operating value, ±20% of operating time Variation due to At 85% to 110% of Overcurrent: ±5% of operating value, ±10% of operating time voltage fluctuation rated voltage Open-phase: ±5% of operating value, ±10% of operating time Reverse-phase: ±5% of operating value, ±10% of operating time Variation due to At 95% to 105% of frequency rated frequency fluctuation Insulation resistance 10 MΩ min. (between current-carrying terminals and mounting panel) 5 MΩ min. (between current-carrying terminals and between contact poles) Dielectric strength 2,500 VAC (between current-carrying terminals and mounting panel and between current-carrying terminals) 1,000 VAC (between contact poles) Permissible impulse voltage Current reverse-phase detection models: 6,000 V (between current-carrying terminals and mounting panel) 4,500 V (between current-carrying terminals and between control power supply terminals) Waveform: 1.2/50 μs Voltage reverse-phase detection models: 4,500 V (between current-carrying terminals and mounting panel) Waveform: 1.2/50 μs Overcurrent strength of main circuit No abnormality develops when 20 times the set current value is applied for 2 s, 2 times with a 1- minute interval. Overvoltage strength of control power No abnormality develops when 1.15 times the relay’s rated voltage is applied once for 3 hours. supply circuit Variation due to waveform distortion No malfunction occurs when pulse containing 100% of the 2nd to 9th harmonics is applied (open- phase switch set to “Low”). (See note.) Vibration Malfunction: 10 to 55 Hz, 0.3-mm double amplitude (in X, Y, and Z directions for 10 minutes each) Destruction: 10 to 25 Hz, 2-mm double amplitude (in X, Y, and Z directions for 2 hours each) 2 Shock Malfunction: 98 m/s (approx. 10 G) in X, Y, and Z directions 2 Destruction: 294 m/s (approx. 30 G) in X, Y, and Z directions Test current Operating time Set time value (reference only) Setting Approx. ±30% of the maximum setting value characteristics of operating time Service life Electrical: 10,000 operations Ambient temperature Operating: −10 to 60 °C (with no icing) Storage: −25 to 65 °C Humidity 35% to 85% Altitude 2,000 m max. Note: This means that no malfunction occurs with the open-phase element, but the operating value of the overload element may vary. 3 K2CM Connections ■ Voltage Reverse-phase Detection Models Terminal Arrangement Manual Operation Low-voltage Circuit (High- capacity Motor) 200 VAC 50/60Hz RS T Ta Tc Tb U VW Stop Start Output contacts Control power (SPDT) supply Magnet Perform the external connections by referring to the examples given below. contactor Obtain the control power supply from the same phase as the power supply to the magnet contactor coil. Connect the phase advancing capacitors closer to the power supply than the current transformer, as shown in the examples. Phase advancing capacitorTighten the terminal screws to a torque of 0.98 N·m max. (The appropriate Current converter for tightening torque is 0.49 to 0.67 N·m.) Alarm measuring device @/5A BZ buzzer Use of insulated solderless terminals is recommended for connection to the Relay terminals (M3.5). R S T U V W Ta Tc Tb U VW Note: 1. In principle, the K2CM must be surface mounted with the terminal M A B C 1 2 3 block facing downward. Motor Motor protective relay 2. Use M5 screws with spring washers and flat washers for mounting. Tighten the screws to a torque of 1.77 N·m max. (The appropriate tightening torque is 1.08 to 1.57 N·m.) Automatic Operation Low-voltage Circuit 200 VAC Manual Operation Low-voltage Circuit 50/60Hz RS T 200 VAC 50/60Hz RS T Stop Automatic Start Magnet contact contactor Magnet contactor BZ Phase advancing Alarm capacitor buzzer BZ Phase Alarm advancing R S T buzzer capacitor U V W Ta Tc Tb U VW A B C 1 2 3 R S T U V W Ta Tc Tb U VW A B C Motor protective relay 1 2 3 Motor protective relay M Motor M Motor Manual Operation High-voltage Circuit Manual Operating Low-voltage Circuit ( 3, 300 VAC 50/60Hz RS T Transformer @/200V Start) 200 VAC 50/60Hz RS T High-tension X/a Stop fuse Stop Start High-voltage magnet contactor Start Auxiliary X Magnet relay contactor Phase advancing capacitor Current converter for measuring device @/5A BZ Alarm BZ Alarm buzzer Phase buzzer advancing R S T capacitor R S T U V W U V W Ta Tc Tb U VW Ta Tc Tb U VW M A B C A B C 1 2 3 1 2 3 High-voltage motor Motor protective relay Motor protective relay changeover Note: Connect the phase advancing capacitor on the power supply side of the Motor Protective Relay as shown in the above dia- M grams. 4 K2CM ■ Current Reverse-phase Detection Models Terminal Arrangement Manual Operation Low-voltage Circuit (High- capacity Motor) 200 VAC 50/60Hz RS T a1 c1 b2 C2 S1 S2 Stop Start Output contacts Control power (NO and NC) supply Magnet Perform the external connections by referring to the examples given below. contactor Connect the phase advancing capacitors closer to the power supply than the current transformer as shown in the examples. Tighten the terminal screws to a torque of 0.98 N·m max. (The appropriate tightening torque is 0.49 to 0.67 N·m.) Phase advancing capacitor Use of insulated solderless terminals is recommended for connection to the Current converter for Alarm Relay terminals (M3.5). measuring device @/5A BZ buzzer Note: 1. In principle, the K2CM must be surface mounted with the terminal block facing downward. R S T U V W a1 c1 c2 b2 s1 s2 M 2. Use M5 screws with spring washers and flat washers for mounting. A B C 1 2 3 Tighten the screws to a torque of 1.77 N·m max. (The appropriate Motor Motor protective relay tightening torque is 1.08 to 1.57 N·m.) Manual Operation Low-voltage Circuit Automatic Operation Low-voltage Circuit 200 VAC 200 VAC 50/60Hz 50/60Hz RS T RS T Stop Start Automatic Magnet contact Magnet contactor contactor BZ BZ Phase Phase advancing Alarm Alarm advancing capacitor buzzer buzzer capacitor R S T R S T U V W U V W a1 c1 b2 c2 s1 s2 a1 c1 b2 c2 s1 s2 A B C A B C 1 2 3 1 2 3 Motor protective relay Motor protective relay M M Motor Motor Manual Operating Low-voltage Circuit ( Manual Operation High-voltage Circuit Start) 3,300 VAC 50/60Hz 200 VAC RS T Transformer @/100V 50/60Hz RS T High-tension X/a Stop Stop fuse Start Start High-voltage magnet contactor Magnet contactor Auxiliary X relay Alarm BZ Phase advancing buzzer Phase capacitor advancing Current converter for capacitor R S T U V W measuring device @/5A a1 c1 b2 c2 s1 s2 A B C BZ 1 2 3 Alarm buzzer Motor protective relay changeover R S T U V W a1 c1 c2 s1 s2 b2 M A B C 1 2 3 M High-voltage motor Motor protective relay Note: Connect the phase advancing capacitor on the power supply side of the Motor Protective Relay as shown in the above diagrams. 5 K2CM Output Circuits ■ Internal Circuit and Operation Description Voltage Reverse-phase Inverse and Instantaneous Detection Models Reset button Types With the voltage reverse-phase RS T A B S1 detection models, the circuit Test button A As shown on the right, the K2CM section enclosed by in the C2 diagram on the left is configured as To each detects abnormalities in motor M X/b2 circuit shown below. The circuit section b2 C by checking its line current. The enclosed by is not used. S2 Voltage C1 motor’s current signal is detected circuit 1 for test U by the current transformer and is a1 X/a1 processed separately for each V To OR circuit phase and input to the respec- W tive circuits. In each circuit, par- allel judgement of failure such as 2 overcurrent, open-phase, or reverse-phase (see note) is To each circuit made based on the input signals. If a failure is detected in a circuit, Overcurrent the circuit’s output is input to the indicator Instantaneous Type LED indication circuit to illuminate the Open-phase With instantaneous-type indicator models, the circuit section LED corresponding LED indicator and Reverse- B enclosed by is phase also input to the relay drive cir- LED configured as shown below. indicator cuit to drive relay X, resulting in a trip signal to be externally output from it. The three major circuits To each circuit are described below. C Note: Applies to current reverse- M X phase detection models only. 3 1) Overcurrent Circuit Overcurrent Detecting Circuit Starting Time Setting Circuit (Instantaneous Type) This circuit detects when the current reaches the overcurrent operat- This circuit performs time setting using the VR for setting the start-up ing level (115% of the set current value). lock time and obtains fixed time-limit characteristics using an RC time-limiting circuit. Time Setting Circuit (Inverse Type) Operation at start-up is shown in the figure below. After the motor This circuit performs time setting using the VR (variable resistor) for turns ON at point A, the motor’s starting current exceeds the start-up the operating time setting and obtains inverse-type characteristics operating value and so the RC time-limiting circuit starts charging. If, using an RC time-limiting circuit. The operating time can be set within for example, the motor current descends below the start-up operat- a range from 2 to 10 s or 8 to 40 s by operating the setting switch ing value (30% max. of the set current value) at point B before the using a VR. The VR covers a time range 5 times the standard range. start-up lock time, tc, has elapsed, the RC time-limiting circuit is reset immediately and when the motor current rises above the start-up Start-up Detecting Circuit (Instantaneous Type) operating value again at point C, the RC time-limiting circuit starts charging again. After the start-up lock time has elapsed (at point D), Instantaneous-type models output a trip signal instantaneously when instantaneous operation is enabled. At the start of operation, the the motor current exceeds the overcurrent operating value (115% of motor current is at its peak immediately after operation starts. It then the set current value). At the start of motor operation, a starting cur- lowers and settles at the rated current. The peak current is about 5 to rent several times the rated current flows and so to prevent the motor 6 times the rated current and takes from several seconds to several circuit being tripped by the starting current, instantaneous operation tens of seconds to settle to the rated current. This time varies largely is not enabled until a fixed time tc has elapsed, as shown in the fig- depending on type of motor and the nature of motor load (wt). There- ure. Instantaneous operation starts after tc has elapsed. Motor start- fore, it is necessary to obtain the motor’s starting time for operation ing time “to” varies, depending on motor type, within a range from with the load and to set a start-up lock time that allows for a margin of several seconds to several tens of seconds. There are even slight dif- error. Do not set an unnecessarily long start-up lock time. If the start- ferences in starting time between the same type of motors and so be up lock time is too long and an accident due to overcurrent occurs at sure to set tc so that to totc, the motor circuit will the start of operation, the trip signal will not be output until the start- be tripped after tc has elapsed. The fixed time limit tc at the start of up lock time has elapsed, possibly resulting in motor burnout. motor operation is called “lock time”. The start-up detecting circuit detects the starting operation level (30% max. of the set current Overcurrent time). operating value Start-up operating value Motor Overcurrent operating value A B C D E F G H current tc tc tc * * Motor current to to: Motor's starting time Operation * ** ** mode Start tc: Lock time at start of operation Start Start Start tc Output Instantaneous operation enabled tc: Start-up lock time *: Fixed time-limit operation Trip Operating mode **: Instantaneous operation enabled Fixed time-limit operation 6 Rectifier/smooth- Reverse-phase Rectifier/smooth- Rectifier/smooth- Rectifier/smooth- detecting circuit ing circuit ing circuit ing circuit ing circuit Open-phase Maximum value To each circuit detecting circuit detecting circuit Current-setting circuit Reverse-phase Open-phase level Overcurrent level detecting Reset circuit detecting circuit circuit detecting circuit Time-setting circuit OR circuit Relay drive circuit Overcurrent Start-up detecting circuit detecting circuit Start time setting circuit Reverse-phase detecting circuit AND circuit Reset circuit Rectifier/smooth- ing circuit K2CM 2) Open-phase Circuit Open-phase switch Maximum phase of "High" T phase operating current: R phase = 1.0 "Low" "High" 1.0 area Open-phase Level Detecting Circuit "Low" Non-operating This circuit detects when the current reaches the open-phase operat- operating area area ing level (85% max. of the set current value). Therefore, open-phase A is not detected until the maximum phase of the current exceeds 85% of the set current value. 25% Open-phase Detecting Circuit 35% 0.5 Output of the maximum value detecting circuit is divided and used as reference values for comparison with the output of the rectifier/ smoothing circuits for the respective phases. If a phase has a value 60% lower than the reference value, the K2CM judges it to be open-phase and outputs an open-phase signal. The following imbalance factors can be selected by setting the open- phase switch. 0 0.5 1.0 “High” . . .Operating imbalance factor: 35 ±10% S phase “Low” . . .Operating imbalance factor: 60% min. 3) Reverse-phase Circuit The imbalance factor can be easily obtained from the following graph. In the graph, the horizontal axis indicates the maximum phase of the current whereas the two vertical axes indicate the remaining 1. Current Reverse-phase Detection Models two phases. The maximum phase of the current is taken to be 1.0 as a reference point. The imbalance factor is obtained as a percentage Reverse-phase Level Detecting Circuit from the curve around the center of the graph. Obtain the imbalance This circuit detects whether the current is in the operating level (50% factor for a motor current with I = 100 A, I = 70 A, and I = 60 A as R S T max. of the set current value) as a precondition to detect the reverse- follows: phase. 1. On the R axis, locate point A, where I = 1.0. R Reverse-phase Detecting Circuit 2. Move from point A to point B, where I = 0.7 on the S axis. S 3. On the T axis, locate point C, where I = 0.6. The current reverse-phase detecting method is employed for detect- T ing reverse-phase as shown below. After the motor starts operating, 4. Follow the curves that pass through points B and C and locate the the current phase becomes transiently unstable during T1 (approx. intersection point D. 0.4 s) and so reverse-phase detection is not performed during this 5. Locating the point corresponding to point D on the imbalance fac- period but it is performed during T2 (approx. 0.1 s). After T2 has tor curve gives an imbalance factor of 36%. Take the maximum elapsed, reverse-phase detection is not performed. For this reason, phase of current on the horizontal axis without considering axes this method cannot be applied to cases where instantaneous R, S, and T. reverse-phase is not permitted. When a reverse-phase is detected, 1.6 1.6 the relay is held in the latched state even after the motor current stops (in both manual and automatic release types). 1.5 1.5 Start 1.4 1.4 1.3 1.3 Motor T1 1.2 1.2 T2 1.1 1.1 Non-detecting area 1.0 1.0 Detecting area 0.9 0.9 T (R, S) 0.8 0.8 S (T, R) 2. Voltage Reverse-phase Detection Models 5.0 0.7 0.7 Point B 10.0 Reverse-phase Detecting Circuit 15.0 Point C 0.6 0.6 20.0 Reverse-phase detecting is performed by using the voltage reverse- 25.0 phase detection method. 0.5 0.5 30.0 35.0 0.4 0.4 Point D 40.0 45.0 0.3 0.3 50.0 55.0 U 60.0 0.2 0.2 65.0 V Reverse-phase output 70.0 75.0 0.1 0.1 80.0 W 85.0 90.0 95.0 0.0 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Point A R (S, T) Generally, in open-phase detection, detecting a complete open- By voltage division within the above RC phase circuit, the output phase is sufficient. In such a case, set the open-phase switch to the becomes 0 V in the normal state or 1.5 V in the reverse-phase “Low” position. If using the motor in an imbalanced condition causes uv problems, or when detecting internal open-phases of a delta-con- state. Using the output from this circuit, the reverse-phase level nected motor, set the switch to the “High” position. Depending on the detecting circuit detects when the current reaches the reverse-phase motor’s load condition and the imbalance of the power supply, how- operating level (80% or less of the control power supply). ever, special consideration may be required for the detection of inter- nal open-phases in delta-connected motors. Consult your OMRON representative before using this method. When a transformer is con- nected as a load, the harmonics increase at low loads. Therefore, in such a case, set the open-phase switch to the “Low” position. 7 OR phase circuit Reverse-phase level detecting circuit K2CM Nomenclature Trip Indicator In normal operation, only the upper half of the display window is colored orange, whereas when the motor circuit has tripped, the entire display window becomes orange. Current-setting Knob 9 10 (side)By operating the setting knob, set the current value to be equal to the rated current of the motor to be used. The current-setting knob uses the same scale as the rated current. Therefore, the operating value will be 115% of the set current value. Example: Operating current value = 12 × 1.15 (115%) = 13.8 A The List of Current Settings shows an example. The rated current differs depending on the motor’s type, construction, manufacturer, etc. Therefore, set the operating current after checking the specifications of the motor. Time-setting knob* 8 7 6 Test Button Reset Button With manual resetting models, when the motor circuit trips during Inverse Type normal operation or test operation, the operation indicators and Operation checks of the overcurrent function can be performed. the output relay can be immediately reset by pressing the reset Pressing the test button for the time-setting value will cause the motor button. circuit to trip. When the motor circuit trips due to reverse-phase with automatic With manual resetting models, even if the test button is released after resetting models, the operation indicators and the output relay can the motor circuit has tripped, the circuit remains tripped, whereas with be immediately reset by pressing the reset button. automatic resetting models, the motor circuit continues operating and Reset button operation is ineffective when the operation power the output relay releases. supply is OFF. When the motor circuit trips during normal opera- Be sure to perform the test operation with the overcurrent switch set to tion, identify the abnormal input function by checking the LED indi- ON. Set both the open-phase and reverse-phase switches to OFF. If cators, then turn OFF the power switch of the main circuit and one of these switches is set to ON, the motor circuit may trip if an proceed with troubleshooting. After the abnormality is removed, open-phase or reverse-phase occurs before an overcurrent does. turn ON the power switch of the main circuit to reset the K2CM. Instantaneous Type Perform the test operation with input current at 0 and the overcurrent Deciding the Number of Primary Conductor Passes switch set to ON. When using a motor with a small current rating, decide the num- Pressing the test button for the set start-up lock time will cause the ber of primary conductor passes through the current transformer motor circuit to trip. holes and the tap setting by referring to the List of Current Set- With manual resetting models, even if the test button is released after tings. the motor circuit has tripped, the circuit remains tripped, whereas with Pass all the three wires through the respective holes of the current automatic resetting models, the motor circuit continues operating and transformer. Basically, the wires should be passed through the the output relay releases. specified holes. If this is difficult, however, they can be passed through any holes provided that the phase order is R, S, and T. Time-setting Knob 1 pass 2 passes Set the required operating time by operating the time-setting knob. (With instantaneous-type models, the set operating time is used as the start-up lock time). Note: 1. The setting scale is the op-The scale multiplying factor R R S S erating time when 600% of can be selected by the time T T the current value is input. scale multiplying factor If the wires are passed through the holes only once, a current within switch. 2. The required operating the full scale of the current-setting knob can be set. If they are time varies depending on passed more than once, however, the current setting range will Scale Time scale the type of motor, load con- multiplying multiplying factor change according to the number of passes. The current setting dition, etc. You can take the factor switch range when the number of conductor passes is n can be obtained time from when the motor Time scale × 1 (s) × 4 (s) by dividing the full scale of the current-setting knob by n. For exam- starts to when the motor value ple, the current setting range of the K2CM-@@L@ is 8 to 26 A when enters the steady state as 22 8 the wires are passed only once. This range is 4 to 13 A when the a guide for setting this val- wires are passed twice, 2 to 6.5 A when the wires are passed four 33 12 ue. When setting the oper- times, and 1 to 3.25 A when the wires are passed eight times. 44 16 ating time for submersible The wires can be passed through the holes any number of times. It motors, which require very 55 20 is convenient for the calculation, however, if the number of passes short operating times, con- 66 24 is 2, 4, or 8. sult the manufacturer to 77 28The signal from a high-voltage motor is input to the Motor Protec- obtain the correct operat- tive Relay via an external current transformer. In this case, the cur- 88 32 ing time. An operating time rent can be set in the same manner as above by dividing the rated 99 36 shorter than 5 s can be current of the high-voltage motor by the transformation ratio of the used as a rough guide. 10 10 40 current transformer. 8 K2CM 3. Reverse-phase Setting Switches LED Indicators These switches select the reverse-phase detection function and When the motor circuit trips due to overcurrent, open-phase, or reverse-phase polarity. By selecting the reverse-phase polarity reverse-phase, the respective LED indicator lights (continuously). accordingly, the K2CM can operate normally without changing the The overcurrent indicator also indicates the start of operation. connections when wired with the order of the phases reversed. Overcurrent operating value Reverse-phase ON Enabled (115% of current-setting value) detecting OFF Disabled Motor current function Bright Bright Reverse-phase Normal The motor circuit trips at reverse- Dimmed polarity phase when a reverse-phase is detected. Reverse Used when a reverse-phase Start Trip connection is made in the power line • With the inverse-type models, when the motor current exceeds the of the motor at a point before the overcurrent operating value, the overcurrent indicator blinks at the current transformer (including bright level and then remains lit at the dimmed level. After the oper- external current transformer). ating time has elapsed, with the manual resetting models, the motor circuit trips and the overcurrent indicator remains lit at the If the K2CM detects reverse-phase although the motor is rotating in bright level, whereas with automatic resetting models, the indicator the forward direction (e.g., because of incorrect wiring of power remains lit at the bright level until the motor current descends below lines), set the reverse-phase polarity switch to the “Reverse” position the resetting value. to enable normal operation. • Since the indicator status is not stored in memory when the opera- Phase condition Normal Reverse Reverse tion power supply is turned OFF, be sure to check which indicators were illuminated when the motor circuit was tripped. RS T RS T RS T Connections (A) (C) The functions of the K2CM can be used in the following seven com- RS T RS T RS T binations. For each function, turn ON the corresponding setting Motor Motor Motor switch. relay relay relay (D) (B) Function Overcurrent Open-phase Reverse-phase M M M Combination Reverse-phase Normal Normal Normal 1ON polarity switch position 2ON Trip None Yes None 3ON Direction of Forward Reverse Reverse 4ON ON motor rotation (See below.) 5ONON 6ON ON 7ON ON ON Reverse Reverse Reverse Reverse Coun- Reverse- When the setting switches for overcurrent, open-phase, or reverse- ter- phase phase function are turned OFF, the following functions becomes mea- polarity invalid. sure switch position Function setting switch Invalid function Wiring Wiring Wiring Wiring Wiring set to OFF changed changed changed changed at (A). at (B). at (C). at (D). Overcurrent Time setting and multiplication Open-phase “High” and “Low” imbalance factors Reverse-phase “Forward” and “Reverse” function Direction of Forward 1. Overcurrent Setting Switches motor rotation These switches select the overcurrent setting and the multiplying factor linked with operating time setting. Note: The K2CM detects reverse-phase at a point before the current transformer. If a reverse connection is made at the load side far Overcurrent ON Enabled from the current transformer and the motor rotates in the re- detecting function verse direction, the K2CM does not detect the reverse-phase. OFF Disabled Time setting × 4 (s) Time setting scale value × 4 = 8 to 40 s Reverse-detectable Range multiplying factor × 1 (s) Time setting scale value × 1 = 2 to 10 s RS T Detectable: Reverse-phase state can be detected with the 2. Open-phase Setting Switches motor protective relay only on the power supply RS T side. These switches select the open-phase detecting function and the “High” or “Low” current imbalance factor for operation. Undetectable: Reverse-phase state on the motor side cannot M be detected with the motor protective relay. Open-phase ON Enabled * The OR phase circuit in the above figure combines a resistor and detecting OFF Disabled capacitor. The reverse phase detection circuit detects when the function reversed signals detected by the OR phase circuit reach the oper- Imbalance factor High The motor circuit operates at an ating level (i.e., 80% or less of the control power supply voltage). operating imbalance factor of 35 ±10%. Low The motor circuit operates at an operating imbalance factor of 60%. 9 K2CM Engineering Data Overload Operating Time Overload Operating Time Characteristics for Inverse Type Characteristics for Instantaneous Type Time scale multiplying factor (× 4) (× 1) 280 70 0.2 This graph shows the behavior when the 240 60 current changes from 100% of the current- setting value to the 200 50 Time scale percentage shown on 10 the horizontal axis. 8 160 40 6 0.1 120 30 4 2 80 20 40 10 0 0 0 100 200 300 400 500 600 700 100 200 300 400 500 600 700 Motor current (percentage of current-setting value) Motor current (percentage of current-setting value) Typical Characteristics of Typical Characteristics of Open-phase Operation Reverse-phase Operation 2.0 0.6 This graph shows the behavior when This graph shows the behavior when the current changes from 100% of the the current changes from 100% of the current-setting value to the percentage current-setting value to the percentage 0.5 shown on the horizontal axis. shown on the horizontal axis. 0.4 1.0 0.3 0.2 0.1 0 100 200 300 400 500 600 700 0 100 200 300 400 500 600 700 Motor current (percentage of current-setting value) Motor current (percentage of current-setting value) 10 Operating time (s) Operating time (s) Operating time (s) Operating time (s) K2CM Dimensions Note: All units are in millimeters unless otherwise indicated. Surface-mounting Models 126 80 6 60 52 46.5 11.5 48.5 15 4 55 33 11 Six, M3 terminal screws Four, 6-dia. mounting holes or four, M5 mounting-screw holes 120 52±0.5 36 80±0.5 33.5 33.5 Three, 20-dia. holes Operating Procedures ■ Operation, Setting, and Indication Based on the current value of the motor to be used, perform the setting of each item of the K2CM Motor Protective Relay. List of Current Settings (when using a 200-VAC motor) Type* K2CM-@@LS@ K2CM-@@L@ K2CM-@@M@ K2CM-@@H@ Number of passes 1124 8 1 1 Setting Time scale value 2 to 8 8 to 26 20 to 65 50 to 160 Current setting range (A) 2 to 8 8 to 26 4 to 13 2 to 6.5 1 to 3.25 20 to 65 50 to 160 Motor*** Rated output (kW) Rated current (A)** 0.2 1.8 0.4 2.8 0.75 4.2 1.5 7.3 2.2 10 3.7 16.1 5.5 24 7.5 32 11 45 15 61 18.5 74 22 87 30 117 37 143.0 * The squares (@) represent the symbols defined under Model Number Legend. ** The rated current is the current at full load. *** Supply: Low-voltage 3-phase basket type inductive motor, full-load characteristics of 200 VAC, 4-pole, totally-enclosed. Note: When using a large-capacity or high-voltage motor whose capacity is 45 kW or more, calculate the rated current/alternating current ratio by converting with the alternating current ratio of the external current transformer. 11 K2CM Testing Method 200 V 50/60 Hz ■ Current Reverse-phase Detection Models (3-phase) U VW The operating characteristics listed in the table below are tested using the circuit shown on the right. Decide the number of conductor 100 VAC passes through the holes of the current transformer in accordance with the operating current range of the Motor Protective Relay and by 50/60Hz SW1 referring to the current setting method described under Operation, Setting, and Indication. 3φSD Y CC 100 V C ± SW2 a1 c1 b2 c2 s1 s2 Minimum set time is 2 s. K2CM Motor Protective Relay 3φSD: Three-phase voltage regulator (5 to 15 A) R1: Variable resistor (50 Ω, 400 W + 400 W) R1 R1 A: AC ammeter (5 A) R2: Fixed resistor (50 Ω, 400 W + 400 W) V: AC voltmeter (300 V) SW1: Knife switch (3-phase) CC: Cycle counter SW2: Toggle switch Y: Auxiliary relay (15 A) R2 Test item Test procedure Operating value Operating time Over- Inverse type 1. Turn ON SW1. 1. Turn ON SW1 and SW2. Increase the current to 600% of current the set current value by adjusting the voltage regulator. 2. Turn ON SW2 to operate auxiliary relay Y. Turn OFF SW1 and SW2.** 3. Gradually increase the current by adjusting the voltage 2. Turn ON SW1. regulator. With inverse-type models, read the value of the current when the overcurrent LED indicator blinks. With 3. Turn ON SW2 and read the position (i.e., time) of the instantaneous-type models, read the value when it lights pointer of cycle counter CC when CC is stopped by the (continuously).* operation of the K2CM. The read time is the operating time for inverse-type models and the lock time of the instanta- 4. Turn OFF SW1 and SW2. neous-type models. 4. Turn OFF SW1 and SW2. Instantaneous 1. Turn ON SW1 and SW2. Increase the current to 100% of type the set current value by adjusting the voltage regulator. Turn OFF SW1 and SW2. 2. Turn ON SW1 and SW2 again and wait 2 seconds mini- mum. 3. Using the voltage regulator, abruptly increase the current to 140% of the set current value. Confirm that the K2CM performs instantaneous operation. 4. Turn OFF SW1 and SW2. Open-phase 1. Open (disconnect) any one of the input phases for the cur- 1. Open (disconnect) any one of the input phases for the cur- rent transformer. rent transformer. 2. Turn ON SW1 and SW2. Gradually increase the current by 2. Turn ON SW1 and SW2. Increase the currents of the other adjusting the voltage regulator. two phases to 115% of the set current value by adjusting the voltage regulator. Turn OFF SW1 and SW2 temporarily. 3. Confirm that the K2CM operates at a current no greater than 85% of the set current value and that, at this current, 3. Turn ON SW1 and SW2 again. Read the position (i.e., the trip indicator is orange and the open-phase LED indica- time) of the pointer of cycle counter CC when CC is tor lights. stopped by the operation of the K2CM. 4. Turn OFF SW1 and SW2. 4. Turn OFF SW1 and SW2. Reverse-phase 1. Interchange any two phases at a position closer to the 1. Interchange any two phases at a position closer to the power supply than the current transformer. (In the above power supply than the current transformer. (In the above figure, phases U and V are interchanged as shown by the figure, phases U and V are exchanged as shown by the dotted lines.) dotted lines.) 2. Turn ON SW1 and SW2. Decrease the current to 50% of 2. Turn ON SW1 and SW2. Increase the current to 100% of the set current value by adjusting the voltage regulator. the set current value by adjusting the voltage regulator. Then turn OFF SW1 and SW2 temporarily. Then turn OFF SW1 and SW2 temporarily. 3. Turn ON SW1 and SW2 again. Confirm that the K2CM 3. Turn ON SW1 and SW2 again. Read the position (i.e., operates, the trip indicator is orange, and that the reverse- time) of the pointer of cycle counter CC when CC is phase LED lights. stopped by the operation of the K2CM. 4. Turn OFF SW1 and SW2. 4. Turn OFF SW1 and SW2. * Balance the currents between phases by adjusting variable resistor R1. ** If a current equal to 600% of the set current value cannot be attained by adjusting the voltage regulator, increase the number of conductor passes through the holes of the current transformer. 12 K2CM ■ Voltage Reverse-phase Detection Models The operating characteristics listed in the table below are tested using the circuit shown on the right. Decide the number of conductor 200 V 50/60 Hz passes through the holes of the current transformer in accordance (3-phase) with the operating current range of the Motor Protective Relay and by U VW referring to the current setting method described under Operation, Setting, and Indication. SW1 100 VAC 50/60 Hz 3φSD Y CC 100 V C ± SW2 Ta Tc Tb U VW Minimum set time is 2 s. K2CM Motor Protective Relay 3φSD: Three-phase voltage regulator (5 to 15 A) R1: Variable resistor (50 Ω, 400 W + 400 W) R1 R1 A: AC ammeter (5 A) R2: Fixed resistor (50 Ω, 400 W + 400 W) V: AC voltmeter (300 V) SW1: Knife switch (3-phase) CC: Cycle counter SW2: Toggle switch Y: Auxiliary relay (15 A) R2 Test item Test procedure Operating value Operating time Over- Inverse type 1. Turn ON SW1. 1. Turn ON SW1 and SW2. Increase the current by adjusting current the voltage regulator to 600% of the set current value. 2. Turn ON SW2 to operate auxiliary relay Y. Turn OFF SW1 and SW2.** 3. Gradually increase the current by adjusting the voltage 2. Turn ON SW1. regulator. With inverse-type models, read the value of the current when the overcurrent LED indicator blinks. With 3. Turn ON SW2 and read the position (i.e., time) of the instantaneous-type models, read the value when it lights pointer of cycle counter CC when CC is stopped by the (continuously).* operation of the K2CM. The read time is the operating time for inverse-type models and the lock time of the instanta- 4. Turn OFF SW1 and SW2. neous-type models. 4. Turn OFF the SW1 and SW2. Instantaneous 1. Turn ON SW1 and SW2. Increase the current to 100% of type the set current value by adjusting the voltage regulator. Then turn OFF SW1 and SW2. 2. Turn ON SW1 and SW2 again and wait 2 seconds mini- mum. 3. Using the voltage regulator, abruptly increase the current to 140% of the set current value. Confirm that the K2CM performs the instantaneous operation. 4. Turn OFF SW1 and SW2. Open-phase 1. Open (disconnect) any one of the input phases for the cur- 1. Open (disconnect) any one of the input phases for the cur- rent transformer. rent transformer. 2. Turn ON SW1 and SW2. Gradually increase the current by 2. Turn ON SW1 and SW2. Increase the currents of the other adjusting the voltage regulator. two phases to 115% of the set current value by adjusting the voltage regulator. Turn OFF SW1 and SW2 temporarily. 3. Confirm that the K2CM operates at a current no greater than 85% of the set current value and that, at this current, 3. Turn ON SW1 and SW2 again. Read the position (i.e., the trip indicator is orange and the open-phase LED indica- time) of the pointer of cycle counter CC when CC is tor lights. stopped by the operation of the K2CM. 4. Turn OFF SW1 and SW2. 4. Turn OFF SW1 and SW2. Reverse-phase 1. Change the phase sequence to reverse-phase by switch- 1. Put the voltage input in the reverse-phase state. ing the U and W input terminals of the K2CM as shown by 2. Turn ON SW1 and SW2 and read the position of the the dotted lines. pointer of cycle counter CC when CC is stopped. 2. Turn ON SW1 and SW2 and confirm that the K2CM oper- 3. Turn OFF SW2. ates. 3. Add a three-phase voltage regulator to the U, V, and W ter- minal inputs. 4. Adjust the voltage regulator and confirm that the K2CM operates at less than 80% of the rated supply voltage. * Balance the currents between phases by adjusting variable resistor R1. ** If a current equal to 600% of the set current value cannot be attained by adjusting the voltage regulator, increase the number of conductor passes through the holes of the current transformer. 13 K2CM Safety Precautions A power supply with a frequency other than commercial frequency ■ Correct Use cannot be used as the control power supply. The operation check using the test button is intended to check theUse of circuits containing a high percentage of harmonics, such as operation of the overcurrent functions. Therefore, be sure to turn circuits incorporating SCR control circuits, VVVF inverters, or recti- ON the overcurrent switch. Also, at this time, turn OFF the open- fiers, may cause errors and malfunctions. Consult your OMRON phase switch and reverse-phase switch to prevent unnecessary representative for details. operations from being performed.When applying the K2CM to the protection of a high-voltage motor The operating time of inverse-type models and the lock time of the or low-voltage, high-capacity motor, use an external rectifier that instantaneous-type models depend upon the set operating time. does not saturate at currents up to 600% of the rated motor current Therefore, do not hold down the test button for more than the set and thus permits a large overcurrent; otherwise, the K2CM will out- operating time. put a tripping signal because of imbalanced operation when an overcurrent occurs and, with reverse-type models, the motor mayThe reverse-phase can be detected in the wiring up to the current be damaged by burning. transformer (including an external current transformer). Check the wiring between the current transformer and the motor before start-Never tamper with the trip indicator. Use the reset switch to reset ing the motor. the K2CM. Current reverse-phase detection models cannot be used in applica-When a power failure occurs in the control power supply, the K2CM tions that do not allow even momentary reversals of motor direc- is not reset even when the reset switch is pressed. This is not an tion. error. The K2CM can be reset only when control power is applied to it.Jogging of the motor can be performed. For details, consult your OMRON representative.Be sure to remount the front cover after detaching it for operating or setting the switches on the front panel.When using the K2CM to control inching shorter than 0.5 s, the reverse-phase level detection circuit may operate. In this case, beThe rectifier and control circuits are combined by tightening the two sure to use the K2CM with the reverse-phase switch set to OFF. screws on the right and left sides. Never loosen these screws. The K2CM is basically intended to protect three-phase loads. ItsThe variable resistors used to make settings are equipped with overcurrent function, however, can also be applied to single-phase mechanisms to stop them rotating outside the valid scale range. Do loads. In this case, the conductors can be passed through the holes not rotate the variable resistors at a torque of 1 kg·cm or more. in any direction and sequence.When using the K2CM-@@@A (instantaneous, automatic reset- When applying the K2CM to a circuit with a high imbalance factor ting), be sure to apply power to the Motor Protective Relay from the due to the nature of the power supply or load, actually measure the same power line as the magnet contactor for switching the motor. imbalance factor and select the open-phase sensitivity accordinglyBe sure to provide the control power supply for the K2CM-@@@@V (i.e., set the open-phase switch to either the high or low position). (voltage reverse-phase detection) from the same line as the motor. The K2CM cannot be used if the imbalance factor is 60% or higher. If current reverse-phase detection models are used in a circuit with When applying the K2CM to the protection of three-phase trans- distorted current waveforms, the reverse-phase element may per- formers, give consideration to the imbalance factor due to single- form an unwanted operation. In such circuits, use of the K2CM- phase loads. @@@@V (voltage reverse-phase detection) is recommended because it is not affected at all by current waveform distortion. Combination Function setting switches LED indicators NOTE Overcur- Open- Reverse- Overcur- Open- Reverse- rent phase phase rent phase phase 1 ON ON If the inputs for combinations of two or more functions are simultaneously generated, the K2CM detects the inputs in 2ON ON the order reverse-phase, open-phase, overcurrent. Take 3ONOFFON combination 4 as an example. If the open-phase and over- 4ON ON ON current occur at the same time, there is insufficient time to detect the overcurrent because the open-phase is first de- 5ONON OFFON tected and the K2CM outputs the tripping signal (causing 6ON ON OFF ON the magnet contactor to turn off). Therefore, the overcur- 7 ONON ONOFF OFF ON rent indicator does not light. 14 K2CM ■ Maintenance and Inspection Q&A The K2CM Motor Protective Relay offers very stable characteristics. To maintain these characteristics for a long time, the following inspections are recommended. What is the VA consumption of the CT section? Q Daily Inspection The consumption is 0.4 VA/phase max. for any CT section. The purpose of daily inspection is to discover causes of failure before using the Motor Protective Relay. This inspection depends somewhat on the perception of the operator as it includes visual checking, etc. Classification Inspection items What action is required if an inverter circuit is used? Q Connections Loosening, damage, and dust collection at screw terminals, damage to wiring insulation sheaths, excessive force applied on wirings, As shown in the following figure, insert the K2CM and turn adhesion of foreign objects to terminal OFF the reverse-phase switch before using the K2CM. screws Motor Protective Relay Adhesion of foreign objects and dust to the operation panel, shift of set value, indication Inverter K2CM status of operation indicators and trip indica- M tor, presence/absence of front cover, loos- Motor ening of screws combining rectifier and control circuits, deformation of case, abnor- Always insert the K2CM on the secondary side (load side) mal temperature on housing surface of the inverter. External rectifier Loosing of terminals, unusual odor, discolor- Mounting Inverter power Inverter load ation of surface location supply Element Periodic Inspection Overcurrent NG Conditionally OK Open-phase NG Conditionally OK This inspection is performed by turning OFF the power at regular intervals to check the aging caused by long-time operation. It is rec- Reverse-phase NG NG ommended that periodic inspection is performed once a year. Error may occur in the operating values depending on the inverter specifications and settings. Set the values after Motor Protective Relay performing tests and confirming operation. Classification Inspection item The current waveform on the inverter power supply side is Construction Adhesion of dust and foreign objects to distorted, so the K2CM may malfunction. terminals, cracks in insulators around The inverter load side contains a large high-frequency terminal block, burn damage to wirings, component, so the K2CM may malfunction due to phase damage to setting knobs, selector reversal. switches, test button, and reset button, damage to insulators of solderless ter-Depending on the specifications and settings of the minals, rust and discoloration of screw inverter, overloads and open phases may also cause the terminals K2CM to malfunction. Operating characteristics Refer to Testing Method. Insulation resistance Between terminals and mounting panel Operation check with test Checking of operating time, operation What action is required if single phase is used? Q button indicators, and trip indicator The following describes the operating procedure for using a External Rectifier single phase with the K2CM. Connection Method Check for adhesion of dust and foreign objects, damage to wirings by Pass wires through any two of the three holes on the burning, and loosening of mounting screws. K2CM. K2CM M Motor If a single phase is used, set the open-phase and reverse- phase switch to OFF. Make the overload settings so that they match the motor current. Do not apply control power supply voltage between the V- W terminals if a model with voltage reverse-phase detection is used. ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. In the interest of product improvement, specifications are subject to change without notice. 15 Terms and Conditions Agreement Read and understand this catalog. Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or comments. Warranties. (a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron disclaims all other warranties, express or implied. (b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the Products or otherwise of any intellectual property right. (c) Buyer Remedy. 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NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM. Programmable Products. Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence thereof. Performance Data. Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability. Change in Specifications. Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our practice to change part numbers when published ratings or features are changed, or when significant construction changes are made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at any time to confirm actual specifications of purchased Product. Errors and Omissions. Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is assumed for clerical, typographical or proofreading errors or omissions. 2016.4 In the interest of product improvement, specifications are subject to change without notice. OMRON Corporation Industrial Automation Company http://www.ia.omron.com/ (c)Copyright OMRON Corporation 2016 All Right Reserved.