APPENDIX
B–64124EN/01
G. ALARM LIST
879
Pulse coder alarms
No. LED display Description Countermeasure
300
A communication error (DTER) for the serial
pulse coder was detected.
Check the connection of the signal cable. If the
cable is normal, the pulse coder may be defec-
tive. Turn the power off. If the alarm recurs
when the power is reapplied, replace the serial
pulse coder, together with the motor.
301
A communication error (CRCER) for the serial
pulse coder was detected.
Check the connection of the signal cable. If the
cable is normal, the pulse coder or servo ampli-
fier unit may be defective. This error can also be
caused by external noise.
302
A communication error (STBER) for the serial
pulse coder was detected.
Check the connection of the signal cable. If the
cable is normal, the pulse coder or servo ampli-
fier unit may be defective. This error can also be
caused by external noise.
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 reapplied, 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 over-
heated, causing the thermostat to trip.
Possible causes include an excessively high
ambient temperature and excessively strict op-
erating conditions. Check the actual cause.
If it occurs again when the motor is cooled, the
motor or servo amplifier may have failed. Re-
place 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 mo-
tor has not yet rotated through more than one
turn after the first power–up.
Rotate the motor 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 seri-
al pulse coder.
Check the connection of the pulse coder signal
cable. If the cable is normal, the pulse coder or
servo amplifier unit may be defective. This er-
ror can also be caused by external noise.