DC Axis Unit Alarms

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. Please contact us if you need testing, a repair or an exchange part. For further information please visit our dedicated Fanuc DC Axis Drive Page.
Type LED Indication Description 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. 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. 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. 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. LVAL 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. HCAL goes on. If abnormal current is applied to the tranistor bridge circuit, the HCAL indiscator goes on and the motor is stopped by the dynamic brake
Circuit malfunction. DCAL goes on. If the regenerative discharge circuit malfunctions or if the acceleration/deceleration rate is too high, the DCAL indicator goes on and the motor is stopped with the dynamic brake.