
8. ALARM LIST
537
No.
LED
display
Description Countermeasure
303
An LED disconnection
(LDAL) was detected in the
serial pulse coder.
Turn the power off. If this
alarm recurs when the
power is reapplied, replace
the motor.
304
A mispulse alarm (PMAL)
for the serial pulse coder
was detected.
Turn the power off. If this
alarm recurs when the
power is reapplied, replace
the motor.
305
A miscount alarm (CMAL)
for the serial pulse coder
was detected.
Turn the power off. If the
alarm recurs when the
power is re–applied, replace
the motor.
If the alarm does not recur,
restart the operation from
reference position return.
306
The motor has overheated
(OHAL).
This alarm is issued when
the motor has overheated,
causing the thermostat to
trip.
Possible causes include an
excessively high ambient
temperature and exces-
sively strict operating condi-
tions. Check the actual
cause.
If it occurs again when the
motor is cooled, the motor or
servo amplifier may have
failed. Replace the faulty
motor or servo amplifier.
308
A soft phase alarm (SPHAL)
was detected.
Turn the power off. This
alarm may be caused by
noise.
319
When the absolute pulse
coder is used, the motor has
not yet rotated through more
than one turn after the first
power–up.
Cause the motor to rotate
through more than one turn
in jog feed mode, then turn
the power off then back on.
350
The battery voltage of the
absolute pulse coder is low.
Replace the battery.
Restart the operation from
reference position return.
351
The battery voltage of the
absolute pulse coder is low.
(warning)
Replace the battery.
401
A communication error was
detected in the serial pulse
coder.
Check the continuity of the
pulse coder signal cable. If
the cable is normal, the
pulse coder or servo amplifi-
er unit may be defective.
This error can also be
caused by external noise.