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K2CM-Q1MA Datasheet(PDF) 8 Page - Omron Electronics LLC |
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K2CM-Q1MA Datasheet(HTML) 8 Page - Omron Electronics LLC |
8 / 16 page K2CM 8 Nomenclature 10 (side) 9 6 7 8 R S T R S T 1 pass 2 passes 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 × 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. 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. Time-setting knob* Reset Button • With manual resetting models, when the motor circuit trips during normal operation or test operation, the operation indicators and the output relay can be immediately reset by pressing the reset button. • When the motor circuit trips due to reverse-phase with automatic resetting models, the operation indicators and the output relay can be immediately reset by pressing the reset button. • Reset button operation is ineffective when the operation power supply is OFF. When the motor circuit trips during normal opera- tion, identify the abnormal input function by checking the LED indi- cators, then turn OFF the power switch of the main circuit and proceed with troubleshooting. After the abnormality is removed, turn ON the power switch of the main circuit to reset the K2CM. Test Button Inverse Type • Operation checks of the overcurrent function can be performed. • Pressing the test button for the time-setting value will cause the motor circuit to trip. • With manual resetting models, even if the test button is released after the motor circuit has tripped, the circuit remains tripped, whereas with automatic resetting models, the motor circuit continues operating and the output relay releases. • Be sure to perform the test operation with the overcurrent switch set to ON. Set both the open-phase and reverse-phase switches to OFF. If one of these switches is set to ON, the motor circuit may trip if an open-phase or reverse-phase occurs before an overcurrent does. Instantaneous Type • Perform the test operation with input current at 0 and the overcurrent switch set to ON. • Pressing the test button for the set start-up lock time will cause the motor circuit to trip. • With manual resetting models, even if the test button is released after the motor circuit has tripped, the circuit remains tripped, whereas with automatic resetting models, the motor circuit continues operating and the output relay releases. Deciding the Number of Primary Conductor Passes • When using a motor with a small current rating, decide the num- ber of primary conductor passes through the current transformer holes and the tap setting by referring to the List of Current Set- tings. • Pass all the three wires through the respective holes of the current transformer. Basically, the wires should be passed through the specified holes. If this is difficult, however, they can be passed through any holes provided that the phase order is R, S, and T. • If the wires are passed through the holes only once, a current within the full scale of the current-setting knob can be set. If they are passed more than once, however, the current setting range will change according to the number of passes. The current setting range when the number of conductor passes is n can be obtained by dividing the full scale of the current-setting knob by n. For exam- ple, the current setting range of the K2CM- @@L@ is 8 to 26 A when the wires are passed only once. This range is 4 to 13 A when the wires are passed twice, 2 to 6.5 A when the wires are passed four times, and 1 to 3.25 A when the wires are passed eight times. The wires can be passed through the holes any number of times. It is convenient for the calculation, however, if the number of passes is 2, 4, or 8. • The signal from a high-voltage motor is input to the Motor Protec- tive Relay via an external current transformer. In this case, the cur- rent can be set in the same manner as above by dividing the rated current of the high-voltage motor by the transformation ratio of the current transformer. Time-setting Knob • 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- erating time when 600% of the current value is input. 2. The required operating time varies depending on the type of motor, load con- dition, etc. You can take the time from when the motor starts to when the motor enters the steady state as a guide for setting this val- ue. When setting the oper- ating time for submersible motors, which require very short operating times, con- sult the manufacturer to obtain the correct operat- ing time. An operating time shorter than 5 s can be used as a rough guide. • The scale multiplying factor can be selected by the time scale multiplying factor switch. Scale multiplying factor Time scale multiplying factor switch Time scale value × 1 (s) × 4 (s) 22 8 33 12 44 16 55 20 66 24 77 28 88 32 99 36 10 10 40 |
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