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9. TROUBLESHOOTING
Display
IFU DRU
Name Definition Cause Action
@A.12@ Memory error 1 RAM, memory fault
@A.13@ Clock error Printed board fault.
@A.15@ Memory error 2 EEP-ROM fault
1. Faulty parts in the drive unit
Checking method
Alarm (A.15)
occurs if power is switched on
after disconnection of all cables
but the control circuit power
supply cables.
Change the drive unit.
2. The number of write times to EEP-
ROM exceeded 100,000.
1. Encoder connector (CN2)
disconnected.
Connect correctly.
2. Encoder fault. Change the servo motor.
@A.16@ Encoder error 1 Communication error
occurred between
encoder and servo
amplifier.
3. Encoder cable faulty.
(Wire breakage or shorted)
Repair or change cable.
CPU/parts fault 1. Faulty parts in the drive unit.
Checking method
Alarm (A.17) occurs if power is
switched on after disconnection of all
cables but the control circuit power
supply cables.
Change the drive unit.@A.17@ Board error 2
The output terminals
U, V, W of the drive
unit and the input
terminals U, V, W of
the servo motor are
not connected.
2. The wiring of U, V, W is
disconnected or not connected.
Correctly connect the output
terminals U, V, W of the drive
unit and the input terminals U,
V, W of the servo motor.
FA.19 @A.19@ Memory error 3 ROM memory fault Faulty parts in the interface unit or
drive unit.
Checking method
Alarm (A.19) occurs if power is
switched on after disconnection of all
cables but the control circuit power
supply cables.
Change the interface unit or
drive unit.
@A.1A@ Servo motor
combination
error
Wrong combination of
drive unit and servo
motor.
Wrong combination of drive unit and
servo motor connected.
Use correct combination.
1. Interface unit connection fault. Connect the interface unit to the
base unit properly.
2. Interface unit failure. Change the interface unit.
FA.1C Base unit bus
error 1
There is error in
communication
between interface unit
and drive unit.
3. Base unit failure. Change the base unit.
1. Drive unit connection fault. Connect the drive unit to the
base unit properly.
2. Drive unit failure. Change the drive unit.
FA.1D Base unit bus
error 2
There is error in
communication
between interface unit
and drive unit.
3. Base unit failure. Change the base unit.
1. Drive unit connection fault. Connect the drive unit to the
base unit properly.
2. Base unit failure. Change the base unit.
FA.1E Drive unit
mounting error
Drive unit came off
the base unit after
initialization.
3. Faulty parts in drive unit.
Checking method
Alarm (A.1E) occurs if power is
switched on after disconnection of
the U, V, W power cables.
Change the drive unit.
1. Encoder connector (CN2) disconnected. Connect correctly.
2. Encoder fault. Change the servo motor.
@A.20@ Encoder error 2 Communication error
occurred between
encoder and drive
unit.
3. Encoder cable faulty.
(Wire breakage or shorted)
Repair or change cable.