FANUC AC Servo Amplifier alarms

Fanuc AC Servo Amplifier alarms. These Alarm and Error Codes cover AC digital servo amp series A06B-6057, and S series amplifier servo drives A06B-6058

The LED indicators on the printed circuit boards of a servo amplifier indicate states of the servo amplifier.

Please contact us if you need testing, a repair or an exchange part. For further information please visit our dedicated Fanuc AC Servo Drive Page.

Alarm CodeColourDescription of Alarm/Error
5VGreenSIGN FOR CONTROL POWER ON

5V indicates the state of power source applied on the board

DRDYGreenSIGN FOR PWM SIGNAL AVAILABLE

DRDT indicates the ready state f servo servo amplifier. The condition of DRDY is no alarm and MCON from NC being low.

HVRedHIGH VOLTAGE ALARM

HV occurs when excessive current has crossed the DC link

HCRedHIGH CURRENT ALARM

HC occurs when excessive current has crossed the DC link.

LVRedLOW VOLTAGE ALARM

LV occurs when the DC link voltage is excessively low or the regulator circuit has a malfunction.

DCRedDISCHARGE ALARM

DC occurs when the capacity of the the discharge circuit has been exceeded.

OHRedOVERHEAT ALARM

OH occurs when a normally closed thermostat contact which is mounted either in the servo amplifier, on a separate discharge unit, or in a power transformer has opened.

FALRedIn case of fuse alarm NFB1-3 and trip of F4/F5.