
B--65245EN/02
2. ALARM DISPLAY AND
CORRESPONDING
COUNTERMEASURES
TROUBLESHOOTING AND
COUNTERMEASURES
139
No. CountermeasureDescriptionLED display
290
The interface switch signal (DRC) was switched
during block execution.
Switch the s ignal after block execution stops.
291
The speed of an axial movementspecified by an
external pulse has exceeded the upper limit.
This occurs only when the EPEXA bit of param-
eter No.001 is set to 1.
Check the speed specified by the external
pulse. Check the magnification of the external
pulse (parameters No.062 and 063).
292
A checksum error for the battery--powered
memory was detected.
Parameters are c leared. Set the parameters
again. If this alarm subsequently recurs, replace
the unit.
Pulse coder alarms
No. LED display Description Countermeasure
300
A communication error (DTER) for the serial
pulse coder was detected.
Check the continuity 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 continuity of the 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. See the chapter on
noise reduction in “Descriptions.”
302
A communication error (STBER) for the serial
pulse coder was detected.
Check the continuity of the 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. See the chapter on
noise reduction in “Descriptions.”
303
An LED disconnection (LDAL) was detected in
the s erial 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 over-
heated, causing the thermostat to trip.
Possible causes include an excessively high
ambient temperature and excessively strict
operating 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
motorhas not yet rotated throughmore thanone
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.