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K2CM

K2CM
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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 overcurrent, open-phase, and reverse-phase. • Circuit and output relay operation can be checked by just operating 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 Legend K2CM-nnn-nn 1 2 3 4 5 6 2. Mounting style None: Surface-mounting, integrated type 3. Operating time characteristics None: Inverse type Q: Instantaneous type 4. Supply voltage of control circuit 1: 100/110/120 VAC 6. Operating time None: x1 (2 to 10 s)/ x4 (8 to 40 s) Switchable 7. Resetting method None: Manual reset A: Automatic reset 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

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Current Reverse-phase Detection Models Note: The start-up lock timer restarts when the operating value at starting becomes less than 30% of the set current value.

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Note: This means that no malfunction occurs with the open-phase element, but the operating value of the overload element may vary.

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Connections ■ Voltage Reverse-phase Detection Models Manual Operation Low-voltage Circuit (Highcapacity Motor) Terminal Arrangement Stop Start Output contacts Control power (SPDT) supply • Perform the external connections by referring to the examples given below. • 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. • Tighten the terminal screws to a torque of 0.98 N·m max. (The appropriate tightening torque is 0.49 to...

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■ Current Reverse-phase Detection Models Terminal Arrangement Manual Operation Low-voltage Circuit (Highcapacity Motor) 200 VAC 50/60Hz R S T Stop Start Output contacts Control power (NO and NC) supply • Perform the external connections by referring to the examples given below. • 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.) • Use of insulated solderless terminals is recommended for connection to the...

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Output Circuits ■ Internal Circuit and Operation Description Reset circuit Voltage Reverse-phase Detection Models With the voltage reverse-phase detection models, the circuit section enclosed by A in the diagram on the left is configured as shown below. The circuit section enclosed by C is not used. Reset circuit Start time setting circuit Start-up detecting circuit Relay drive circuit Instantaneous Type With instantaneous-type models, the circuit section enclosed by B is configured as shown below. Overcurrent detecting circuit Open-phase detecting circuit Overcurrent indicator Open-phase...

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K2CM 2) Open-phase Circuit T phase 1.0 Open-phase Level Detecting Circuit Open-phase Maximum phase of switch current: R phase = 1.0 "High" This circuit detects when the current reaches the open-phase operating level (85% max. of the set current value). Therefore, open-phase is not detected until the maximum phase of the current exceeds 85% of the set current value. The following imbalance factors can be selected by setting the openphase switch. “High” . . .Operating imbalance factor: 35 ±10% “Low” . . .Operating imbalance factor: 60% min. The imbalance factor can be easily obtained from the...

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Nomenclature Trip Indicator Test Button Current-setting Knob • 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 x 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. •...

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3. Reverse-phase Setting Switches When the motor circuit trips due to overcurrent, open-phase, or reverse-phase, the respective LED indicator lights (continuously). The overcurrent indicator also indicates the start of operation. These switches select the reverse-phase detection function and reverse-phase polarity. By selecting the reverse-phase polarity accordingly, the K2CM can operate normally without changing the connections when wired with the order of the phases reversed. Start Trip • With the inverse-type models, when the motor current exceeds the overcurrent operating value, the...

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Engineering Data Overload Operating Time Characteristics for Instantaneous Type Overload Operating Time Characteristics for Inverse Type Time scale multiplying factor (x 4) (x 1) Typical Characteristics of Open-phase Operation Typical Characteristics of Reverse-phase Operation Motor current (percentage of current-setting value) Motor current (percentage of current-setting value)

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Dimensions Note: All units are in millimeters unless otherwise indicated. Four, 6-dia. mounting holes or four, M5 mounting-screw holes 120 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* Setting Time scale value Current setting range (A) 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...

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