
B–63665EN/01
7. TROUBLESHOOTING
345
For an explanation of the following servo alarms, refer to the FANUC
SERVO MOTOR α Series Maintenance Manual (B–65165E).
Number Message Contents
417 n–TH AXIS–PARAMETER INCORRECT The setting of a servo–related parameter is incorrect.
430 n AXIS: SV. MOTOR OVERHEAT A servo motor overheat occurred.
431 n AXIS: CNV. OVERLAOD PSM: Overheat occurred.
432 n AXIS: CNV. LOWVOLT CON./
POWERFAULT
PSM: Phase missing occurred in the input voltage.
PSMR: The control power supply voltage has dropped.
433 n AXIS: CNV. LOW VOLT DC LINK PSM: The DC link voltage has dropped.
PSMR: The DC link voltage has dropped.
434 n AXIS: INV. LOW VOLT CONTROL SVM: The control power supply voltage has dropped.
435 n AXIS: INV. LOW VOLT DC LINK SVM: The DC link voltage has dropped.
436 n AXIS: SOFTTHERMAL (OVC) The digital servo software detected the soft thermal state (OVC).
437 n AXIS: CNV. OVERCURRENT POWER PSM: Overcurrent flowed into the input circuit.
438 n AXIS: INV. ABNORMAL CURRENT SVM: The motor current is too high.
439 n AXIS: CNV. OVERVOLT POWER PSM: The DC link voltage is too high.
440 n AXIS: CNV. EX DECELERATION POW. PSMR: The regenerative discharge amount is too large.
441 n AXIS: ABNORMAL CURRENT OFFSET The digital servo software detected an abnormality in the motor
current detection circuit.
442 n AXIS: CNV. CHARGE FAULT/INV. DB PSM: The spare discharge circuit of the DC link is abnormal.
PSMR: The spare discharge circuit of the DC link is abnormal.
443 n AXIS: CONV. COOLING FAN FAILURE PSM: The internal stirring fan failed.
PSMR: The internal stirring fan failed.
444 n AXIS: INV. COOLING FAN FAILURE SVM: The internal stirring fan failed.
445 n AXIS: SOFT DISCONNECT ALARM The digital servo software detected a broken wire in the pulse
coder.
446 n AXIS: HARD DISCONNECT ALARM A broken wire in the built–in pulse coder was detected by
hardware.
If the hardware on the CNC is suspected to be defective as a result of
examination, replace the axis control cards.
7.37
SERVO ALARMS