Fanuc DC Axis Unit Alarms and Error Codes

Fanuc DC Axis Unit Alarms. If you need information on FANUC DC Axis unit alarms for A06B-6047 series Velocity control units please contact us.

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TypeIndicationDescription of Alarm/Error
Overload.On the NC control unit.This overload alarm occurs if the motor current exceeds the current required to actuate the thermal relay. Or if the power transformer thermostat or the regenerative discharge unit thermostat operates
Velocity feedback wire break.LED indicator TGLS goes on.If the motor speed exceeds the specified upper limit due to a break in in the velocity feedback wire, the TGLS indicator goes on. The motor is stopped by the dymanic brake.
Overcurrent.LED indicator OVC goes on.If the motor current exceeds the specified upper limit for more than the fixed period( about 600 msec), the OVC indicator goes on. The motor is stopped by the dynamic brake.
Circuit Breaker.The ON button of the circuit breaker pops up and the LED indicator BRK goes on.If an abnormal current exceeding the rating limit of the breaker is applied to the motor, the circuit breaker operates. The motor is stopped by the dynamic brake.
Overvoltage alarm.LED indicator HVAL goes on.If the AC input voltage applied to the servo transformer  exceeds the allowable value, the HVAL indictator goes on.  The motor is stopped by the dynamic brake.
Low voltage Alarm.LED indicator HCAL goes on.If the AC power source voltage drops abnormally, the LVAL indicator goes on. The motor is stopped by the dynamic brake.
Circuit malfunction.LED indicator DCAL goes on.If abnormal current is applied to the transistor bridge circuit, the HCAL indicator goes on. The motor is stopped by the dynamic brake.