
B–63835EN/03
F. FSSB START–UP PROCEDURE/
MATERIALS
APPENDIX
669
NC
alarm
No.
DescriptionMessage
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 DISCON-
NECT ALARM
The digital servo software detected a broken
wire in the pulse coder.
446 n AXIS : HARD DISCON-
NECT ALARM
A broken wire in the built–in pulse coder
was detected by hardware.
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 that of feedback
data from the separate detector.
449 n AXIS : INV. IPM ALARM 1) SVM: IPM (intelligent power module) de-
tected an alarm.
2) α series SVU: IPM (intelligent power
module) detected an alarm.
453 n AXIS : SPC SOFT DIS-
CONNECT ALARM
Software disconnection alarm of the α pulse
coder.
Turn off the power to the CNC, then remove
and insert the pulse coder cable. If this
alarm is issued again, replace the pulse
coder.
456 ILLEGAL CURRENT LOOP The current control cycle settings (parame-
ter No. 2004, bit 0 of parameter No. 2003,
and bit 0 of parameter No. 2013) are incor-
rect. 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 control 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 meth-
od of them, are not satisfied.
457 ILLEGAL HI HRV (250US) Use of high–speed HRV is specified al-
though the current control cycle is 200 µs.
458 CURRENT LOOP ERROR The current control cycle setting does not
match the actual current control cycle.
459 HI HRV SETTING ERROR Of two axes having adjacent servo axis
numbers (parameter No. 1023), odd number
and even number, high–speed HRV control
can be performed for one axis and not for
the other.