ABB REM54 motor terminal troubleshooting

On site troubleshooting checklist

Ready light flashes and IRF code appears. Record the IRF code, check the power supply, self-test module, I/O and RTD modules, ensure that the protection trip is locked, and do not forcefully put them into operation.

The analog quantity has a large deviation. Check the CT/VT ratio, sensor ratio, channel scaling factor, whether unused sensor inputs are short circuited, shielded, and grounded.

Misoperation outside the differential zone. Check CT polarity, transformation ratio, stable resistance, secondary multi-point grounding, Diff6G/Diff3/REF1A constant value, and braking characteristics.

Low current grounding does not trip. Check if a core balanced CT is used; it is not recommended to use three-phase summation as a substitute for sensitive grounding below 10% of the rated value.

The motor starts and trips. Check VOC voltage control, TOL3Dev device type and time constant, MotStart startup supervision, startup frequency, and restart suppression.

Trip circuit alarm. Check the CMTCS1/2 constant current monitoring circuit, trip coil, auxiliary contacts, control voltage, and terminals.

Communication interruption. Check the front panel/rear ports RER123/RER103、 Converter, protocol, baud rate, LON binding, and Modbus point table.

Complete machine replacement. Verify the complete order number, hardware number, power supply, sensor/transformer input, display language, Modbus options, and I/O quantity; Replace and recalibrate the test.