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8. TROUBLESHOOTING
8 - 2 Remedies for alarms
WARNING
NOTICE
When an alarm occurs, the display shows the corresponding alarm number, and the servo motor comes to
a stop. Remove the cause of the alarm in accordance with this section. The optional set-up software may
be used to refer to the cause.
Display
Name
10
Undervoltage
11
Board error 1
12
Memory error 1
13
Clock error
15
Memory error 2
16
Encoder error 1
17
Board error 2
18
Board error 3
When any alarm has occurred, eliminate its cause, ensure safety, then reset the
alarm, and restart operation. Otherwise, injury may occur.
When the absolute position erase alarm (25) has occurred, always make home
position setting again. Not doing so can cause runaway.
When any of the following alarms has occurred, always remove its cause and allow
about 30 minutes for cooling before resuming operation. If operation is repeated by
switching control circuit power off, then on to reset the alarm, the servo amplifier,
servo motor and regenerative brake option may become faulty.
Regenerative error (30)
Overload 1 (50)
Overload 2 (51)
Definition
Power supply voltage
1. Power supply voltage is low.
dropped to 160V or
2. Power failed instantaneously for
less
3. Shortage of power supply capacity
4. Power was restored after the bus
5. Faulty parts in the servo amplifier
Printed board faulty
Faulty parts in the servo amplifier
RAM, ROM memory
fault
Printed board fault
EEP-ROM fault
Communication error
1. Encode connector disconnected.
occurred between
2. Encoder fault
encoder and servo
3. Encoder cable faulty
amplifier.
4. Combination of servo amplifier and
CPU/parts fault
Faulty parts in the servo amplifier
Cause
100ms or longer.
caused the power supply voltage to
drop at start, etc.
voltage had dropped to 200VDC.
(Main circuit power switched on
within 5S after it had switched off.)
Checking method
Alarm (10) occurs if power is
switched on after CN1A, CN1B
and CN3 connectors are
disconnected.
Checking method
Alarm (any of 11 to 13 and 15)
occurs if power is switched on
after CN1A, CN1B and CN3
connectors are disconnected.
(Wire breakage or short)
servo motor is not proper.
Checking method
Alarm (17 or 18) occurs if power
is switched on after CN1A, CN1B
and CN3 connectors have been
disconnected.
8 - 2
Action
Review the power supply.
Change the servo amplifier.
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change cable.
Use correct combination.
Change the servo amplifier.
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