
APPENDIXA. ALARM LIST
B–64115EN/01
534
Number ContentsMessage
431 n AXIS : CNV. OVERLOAD 1) PSM: Overheat occurred.
2) β series SVU: Overheat occurred.
432 n AXIS : CNV. LOW VOLT CON-
TROL
1) PSM: Control power voltage has dropped.
2) PSMR: The control power supply voltage has dropped.
3) β 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 CUR-
RENT
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 cur-
rent detection circuit.
442 n AXIS : CNV. CHARGE FAILURE 1) PSM: The spare discharge circuit of the DC link is abnormal.
2) PSMR: The spare discharge circuit of the DC link is abnormal.
443 n AXIS : CNV. COOLING FAN FAIL-
URE
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 FAIL-
URE
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.
447 n AXIS : HARD DISCONNECT (EXT) A broken wire in the separate detector was detected by hardware.
448 n AXIS : UNMATCHED FEEDBACK
ALARM
The sign of feedback data from the built–in pulse coder differs from
that of feedback data from the separate detector.
449 n AXIS : INV. IPM ALARM 1) SVM: IPM (intelligent power module) detected an alarm.
2) α series SVU: IPM (intelligent power module) detected an alarm.
453 n AXIS : SPC SOFT DISCONNECT
ALARM
Software disconnection alarm of the α pulse coder.
Turn off the power to the CNC, then remove and insert the pulse cod-
er cable. If this alarm is issued again, replace the pulse coder.