
B–64115EN/01
8. TROUBLESHOOTING
501
Number ContentsMessage
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 FAULT 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.
456 ILLEGAL CURRENT LOOP The current control cycle settings (parameter No. 2004, bit 0 of pa-
rameter No. 2003, and bit 0 of parameter No. 2013) are incorrect.
Possible problems are as follows.
– For the two axes whose servo axis numbers (settings of parameter
No. 1023) are an odd number followed by an even number (a pair
of axes 1 and 2 or axes 5 and 6, for example), a different current con-
trol cycle is set for each of the axes.
– The requirements for slaves needed for the set current control cycle,
including the number, type, and connection method of them, are not
satisfied.
457 ILLEGAL HI HRV (250US) Use of high–speed HRV is specified although the current control
cycle is 200 ms.
458 CURRENT LOOP ERROR The current control cycle setting does not match the actual current
control cycle.
459 HI HRV SETTING ERROR For the two axes whose servo axis numbers (settings of parameter
No. 1023) are an odd number followed by an even number (a pair of
axes 1 and 2 or axes 5 and 6, for example), the SVM for one of the
axes supports high–speed HRV control but the SVM for the other
does not. Refer to the SVM specification.