
APPENDIX
G. FSSB START–UP PROCEDURE/
MATERIALS
B–63665EN/01
472
Alarms related to servo amplifiers
NC
alarm
No.
Message Description
430 n AXIS : SV. MOTOR OVER-
HEAT
A servo module overheat occurred.
431 n AXIS : CNV. OVERLOAD A converter (PSM) overheat occurred.
432 n AXIS : CNV. LOWVOLT
CON./POWFAULT
The control power supply voltage (24 V) has
dropped.
433 n AXIS : CNV. LOW VOLT DC
LINK
The DC link voltage has dropped.
436 n AXIS : SOFTTHERMAL
(OVC)
The digital servo software detected the soft
thermal state (OVC).
438 n AXIS : INV. ABNORMAL
CURRENT
The current of the main circuit is too high.
439 n AXIS : CNV. OVERVOLT
POWER
The DC link voltage is too high.
440 n AXIS : CNV. EX DECEL-
ERATION POW.
The regenerative discharge amount is too
high.
441 n AXIS : ABNORMAL CUR-
RENT OFFSET
The digital servo software detected an ab-
normality in the motor current detection cir-
cuit.
443 n AXIS : CNV. COOLING FAN
FAILURE
The internal stirring fan failed.
445 n AXIS : SOFT DISCON-
NECT ALARM
The digital servo software detected a broken
wire in the detector.
447 n AXIS : HARD DISCON-
NECT (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 the sign of the feed-
back data from the separate detector.