
B-63945EN/02 11.TROUBLESHOOTING
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11.22 SERVO ALARMS
For an explanation of the following servo alarms, refer to the FANUC
SERVO MOTOR αi series Maintenance Manual (B-65285EN).
Number Message Contents
SV0417 ILL DGTL SERVO PARAMETER A digital serve parameter setting is incorrect.
SV0420 SYNC TORQUE EXCESS In feed axis synchronization control, for synchronization, the
difference value of torque between a master and slave axes
exceeded the parameter (No. 2031) setting value.
This alarm occurs for a master axis.
SV0421 EXCESS ERROR(SEMI-FULL) The difference between the feedback from the semi and full
sides exceeded the setting of parameter No.1729.
SV0422 EXCESS VELOCITY IN TORQUE In torque control, the commanded permissible velocity was
exceeded.
SV0423 EXCESS ERROR IN TORQUE In torque control, the total permissible move value specified
as a parameter was exceeded.
SV0430 SV MOTOR OVERHEAT The servo motor has overheated.
SV0431 CNV. OVERLOAD PSM : Overheat
β series SVU : Overheat
SV0432 CNV. LOW VOLT CONTROL PSM : The control power supply voltage has dropped.
PSMR : The control power supply voltage has dropped.
β series SVU : The control power supply voltage has
dropped.
SV0433 CNV. LOW VOLT DC LINK PSM : Low DC link voltage
PSMR : Low DC link voltage
α series SVU : Low DC link voltage
β series SVU : Low DC link voltage
SV0434 INV. LOW VOLT CONTROL SVM : Low control power voltage
SV0435 INV. LOW VOLT DC LINK SVM : Low DC link voltage
SV0436 SOFTTHERMAL(OVC) The digital servo software detected a software thermal
(OVC).
SV0437 CNV. OVERCURRENT POWER PSM : Overcurrent on input circuit section.
SV0438 INV. ABNORMAL CURRENT SVM : Motor overcurrent
α series SVU : Motor overcurrent
β series SVU : Motor overcurrent
SV0439 CNV. OVER VOLT DC LINK PSM : The DC link voltage is too high.
PSMR : The DC link voltage is too high.
β series SVU : The DC link voltage is too high.
SV0440 CNV. EX DECELERATION POW. PSMR : Excessive generative discharge
α series SVU : Excessive generative discharge, or abnormal
error in generative power circuit
SV0441 ABNORMAL CURRENT OFFSET The digital servo software detected an abnormality in the
motor current detection circuit.
SV0442 CNV. CHARGE FAILURE PSM : The spare charge circuit for the DC link is abnormal.
PSMR : The spare charge circuit for the DC link is abnormal.
SV0443 CNV. COOLING FAN FAILURE PSM : Internal cooling fan failure.
PSMR : Internal cooling fan failure.
β series SVU : Internal cooling fan failure.
SV0444 INV. COOLING FAN FAILURE SVM : Internal cooling fan failure.
SV0445 SOFT DISCONNECT ALARM The digital servo software detected a disconnected
Pulsecoder.