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8. TROUBLESHOOTING
Display Name Definition Cause Action
(Note)
888
Watchdog CPU, parts faulty Fault of parts in servo amplifier
Checking method
Alarm (888) occurs if power is
switched on after disconnection of
all cables but the control circuit
power supply cable.
Change the servo amplifier.
Note. At power-on, "888" appears instantaneously, but it is not an error.
8.3 Remedies for warnings
CAUTION
If an absolute position counter warning (E3) occurred, always make home position
setting again. Not doing so may cause unexpected operation.
POINT
When any of the following alarms has occurred, do not resume operation by
switching power of the servo amplifier OFF/ON repeatedly. The servo amplifier
and servo motor may become faulty. If the power of the servo amplifier is
switched OFF/ON during the alarms, allow more than 30 minutes for cooling
before resuming operation.
Excessive regenerative warning (E0)
Overload warning 1 (E1)
If E6, E7 or E9 occurs, the servo off status is established. If any other warning occurs, operation can be
continued but an alarm may take place or proper operation may not be performed.
Remove the cause of warning according to this section. Use the MR Configurator to refer to a factor of warning
occurrence.
Display Name Definition Cause Action
1. Battery cable is open. Repair cable or changed. 92 Battery cable
disconnection
warning
Absolute position detection
system battery voltage is
low.
2. Battery voltage supplied from the servo
amplifier to the encoder fell to about 3V or
less.
(Detected with the encoder)
Change the battery.
1. Droop pulses remaining are greater than
the in-position range setting.
Remove the cause of droop pulse
occurrence
2. Command pulse entered after clearing of
droop pulses.
Do not enter command pulse
after clearing of droop pulses.
96 Home position
setting warning
Home position setting
could not be made.
3. Creep speed high. Reduce creep speed.
9F Battery warning Voltage of battery for
absolute position detection
system reduced.
Battery voltage fell to 3.2V or less.
(Detected with the servo amplifier)
Change the battery.
E0 Excessive
regeneration
warning
There is a possibility that
regenerative power may
exceed permissible
regenerative power of
built-in regenerative
resistor or regenerative
option.
Regenerative power increased to 85% or
more of permissible regenerative power of
built-in regenerative resistor or regenerative
option.
Checking method
Call the status display and check
regenerative load ratio.
1. Reduce frequency of
positioning.
2. Change the regenerative
option for the one with larger
capacity.
3. Reduce load.