
8. ALARM LIST
501
No. ContentsMessage
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 coder
cable. If this alarm is issued again, replace
the pulse coder.
456 ILLEGAL CURRENT LOOP The current control cycle settings
(PRM2004, 2003#0, and 2013#0) are in-
correct. Possible problems are as follows.
– For the two axes whose servo axis
numbers (settings of PRM1023) are an
odd number followed by an even num-
ber (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 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 (PRM1023), odd number and
even number, high–speed HRV control can
be performed for one axis and not for the
other.
460 n AXIS : FSSB
DISCONNECT
FSSB communication was disconnected
suddenly. The possible causes are as fol-
lows:
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 as-
signed 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 amplifier 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 amplifi-
er does not match that for the motor.