
APPENDIXG. ALARM LIST
B–63844EN/02
834
Number ContentsMessage
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
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.
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.
456 n AXIS : ILLEGAL CURRENT LOOP An illegal current control period was specified.
The amplifier pulse module in use does not match high–speed HRV.
Alternatively, the system does not satisfy a constraint for performing
high–speed HRV control.
457 n AXIS : ILLEGAL HI HRV (250US) It is specified that, when the current control period is 250 ms, high–
speed HRV control is to be used.
458 n AXIS : CURRENT LOOP ERROR The specified current control period dose not match the actual cur-
rent control period.
459 n AXIS : HI HRV SETTING ERROR In a pair of axes in which one axis has an odd servo axis number (pa-
rameter No. 1023) and the other has an even servo axis number that is
adjacent to the odd servo axis number, high–speed HRV control is sup-
ported for one of the axes and not supported for the other axis.
460 n AXIS : FSSB DISCONNECT FSSB communication was disconnected suddenly. The possible
causes are as follows:
1) The FSSB communication cable was disconnected or broken.
2) The power to the amplifier was turned off suddenly.
3) A low–voltage alarm was issued by the amplifier.
461 n AXIS : ILLEGAL AMP INTERFACE The axes of the 2–axis amplifier were assigned to the fast type interface.
462 n AXIS : SEND CNC DATA FAILED Because of an FSSB communication error, a slave could not receive
correct data.
463 n AXIS : SEND SLAVE DATA
FAILED
Because of an FSSB communication error, the servo system could
not receive correct data.
464 n AXIS : WRITE ID DATA FAILED An attempt was made to write maintenance information on the ampli-
fier maintenance screen, but it failed.
465 n AXIS : READ ID DATA FAILED At power–up, amplifier initial ID information could not be read.
466 n AXIS : MOTOR/AMP
COMBINATION
The maximum current rating for the amplifier does not match that for
the motor.