SRVO-045: HCAL alarm (overcurrent)
Excessively high current flowed in the amplifier's main circuit for the named axis.
What it means
Excessively high current flowed in the amplifier's main circuit for the named axis. The diagnosis FANUC prescribes is a proper isolation test: disconnect and check whether the amplifier alarms alone, then test the cabling and motor windings. Power-cycle required to clear.
Common causes
Ranked by what technicians most often find, most likely first.
- Short or insulation failure in the motor power cable (U/V/W to ground or to each other).
- Motor winding failure - unequal phase-to-phase resistance.
- Amplifier fault (alarms even with the power cable disconnected).
How to fix it
- This alarm indicates a high-current fault in the amplifier's main circuit for the named axis, and diagnosing it means working around stored lethal voltage: the amplifier's DC bus capacitors hold a charge after power-off. This is qualified-technician work following lockout/tagout, not a field fix to attempt otherwise. A technician will isolate the fault among three possibilities (a short or insulation failure in the motor power cable, a motor winding failure, or a failed amplifier) by testing whether the amplifier still alarms with the motor cable disconnected, then insulation-testing the cable and checking motor winding resistance. If your site does not have qualified personnel for high-voltage servo work, this is an OEM service call. Power-cycle to clear.
Quick facts
- Category
- Servo
- Affected series
- R-30iB; R-30iB Mate; R-30iB Plus; R-30iB Mate Plus
- Alarm family
- SRVO