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K2CM-4L Datasheet(PDF) 15 Page - Omron Electronics LLC |
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K2CM-4L Datasheet(HTML) 15 Page - Omron Electronics LLC |
15 / 16 page K2CM 15 ■ Maintenance and Inspection The K2CM Motor Protective Relay offers very stable characteristics. To maintain these characteristics for a long time, the following inspections are recommended. Daily Inspection 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. Periodic Inspection This inspection is performed by turning OFF the power at regular intervals to check the aging caused by long-time operation. It is rec- ommended that periodic inspection is performed once a year. Motor Protective Relay External Rectifier Check for adhesion of dust and foreign objects, damage to wirings by burning, and loosening of mounting screws. What is the VA consumption of the CT section? The consumption is 0.4 VA/phase max. for any CT section. What action is required if an inverter circuit is used? As shown in the following figure, insert the K2CM and turn OFF the reverse-phase switch before using the K2CM. • Always insert the K2CM on the secondary side (load side) of the inverter. • Error may occur in the operating values depending on the inverter specifications and settings. Set the values after performing tests and confirming operation. • The current waveform on the inverter power supply side is distorted, so the K2CM may malfunction. • The inverter load side contains a large high-frequency component, so the K2CM may malfunction due to phase reversal. • Depending on the specifications and settings of the inverter, overloads and open phases may also cause the K2CM to malfunction. • Using a K2MR is recommended to protect the inverter motor. What action is required if single phase is used? The following describes the operating procedure for using a single phase with the K2CM. • Connection Method Pass wires through any two of the three holes on the K2CM. • 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. Classification Inspection items Connections Loosening, damage, and dust collection at screw terminals, damage to wiring insulation sheaths, excessive force applied on wirings, adhesion of foreign objects to terminal screws Motor Protective Relay Adhesion of foreign objects and dust to the operation panel, shift of set value, indication status of operation indicators and trip indica- tor, presence/absence of front cover, loos- ening of screws combining rectifier and control circuits, deformation of case, abnor- mal temperature on housing surface External rectifier Loosing of terminals, unusual odor, discolor- ation of surface Classification Inspection item Construction Adhesion of dust and foreign objects to terminals, cracks in insulators around terminal block, burn damage to wirings, damage to setting knobs, selector switches, test button, and reset button, damage to insulators of solderless ter- minals, rust and discoloration of screw terminals Operating characteristics Refer to Testing Method. Insulation resistance Between terminals and mounting panel Operation check with test button Checking of operating time, operation indicators, and trip indicator Mounting location Element Inverter power supply Inverter load Overcurrent NG Conditionally OK Open-phase NG Conditionally OK Reverse-phase NG NG Q&A Q Q M Motor K2CM Inverter Q M Motor K2CM In the interest of product improvement, specifications are subject to change without notice. ALL DIMENSIONS SHOWN ARE IN MILLIMETERS. To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527. |
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