
APPENDIX
B–63084EN/02
G. ALARM LIST
731
Number ContentsMessage
420 SERVO ALARM: n AXIS SYNC
TORQUE
(M series)
During simple synchronous control, the difference between the torque
commands for the master and slave axes exceeded the value set in pa-
rameter No. 2031.
421 SERVO ALARM: n AXIS EXCESS
ER (D)
The difference between the errors in the semi–closed loop and closed
loop has become excessive during dual position feedback. Check the
values of the dual position conversion coefficients in parameters No.
2078 and 2079.
422 SERVO ALARM: n AXIS In torque control of PMC axis control, a specified allowable speed has
been exceeded.
423 SERVO ALARM: n AXIS In torque control of PMC axis control, the parameter–set allowable cu-
mulative travel distance has been exceeded.
430 n AXIS : SV. MOTOR OVERHEAT A servo motor overheat occurred.
431 n AXIS : CNV. OVERLOAD 1) PSM: Overheat occurred.
2) β series SVU: Overheat occurred.
432 n AXIS : CNV. LOWVOLT
CON./POWFAULT
1) PSM: Phase missing occurred in the input voltage.
2) PSMR: The control power supply voltage has dropped.
3) α series SVU: The control power supply voltage has dropped.
433 n AXIS : CNV. LOW VOLT DC LINK 1) PSM: The DC link voltage has dropped.
2) PSMR: The DC link voltage has dropped.
3) α series SVU: The DC link voltage has dropped.
4) β series SVU: 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
1) SVM: The motor current is too high.
2) α series SVU: The motor current is too high.
3) β series SVU: The motor current is too high.
439 n AXIS : CNV. OVERVOLT POWER 1) PSM: The DC link voltage is too high.
2) PSMR: The DC link voltage is too high.
3) α series SVU: The C link voltage is too high.
4) β series SVU: The link voltage is too high.
440 n AXIS : CNV. EX DECELERATION
POW.
1) PSMR: The regenerative discharge amount is too large.
2) α series SVU: The regenerative discharge amount is too large. Al-
ternatively, the regenerative discharge circuit is abnormal.
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
1) PSM: The spare discharge circuit of the DC link is abnormal.
2) PSMR: The spare discharge circuit of the DC link is abnormal.
3) α series SVU: The dynamic brake circuit is abnormal.
443 n AXIS : CNV. COOLING FAN
FAILURE
1) PSM: The internal stirring fan failed.
2) PSMR: The internal stirring fan failed.
3) β series SVU: The internal stirring fan failed.
444 n AXIS : INV. COOLING FAN
FAILURE
SVM: The internal stirring fan failed.