Fanuc DC Axis Unit Alarms and Error Codes listed on this page only cover the M Series DC Axis units series 6047 (Yellow cap motors).

If your interested in finding stock of Fanuc DC Axis drive units (Velocity Control Unit).

IndicationTypeDescription of Alarms
NCOverloadOverload 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
TGLSTacho GeneratorMotor 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.
OVCOver CurrentMotor 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.
BRKCircuit BreakerAbnormal 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.
HVALOver VoltageAC input voltage applied to the servo transformer  exceeds the allowable value, the HVAL indictator goes on.  The motor is stopped by the dynamic brake.
HCALLow VoltageAC power source voltage drops abnormally, the LVAL indicator goes on. The motor is stopped by the dynamic brake.
DCALDC IssueAbnormal current is applied to the transistor bridge circuit, the HCAL indicator goes on. The motor is stopped by the dynamic brake.

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