Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 664

16. INDEXER POSITIONING OPERATION
Display Name
Main circuit Ground fault
A24
error occurred at the
servo motor
power output
(U, V, and W).
Absolute Absolute
A25
position erase position data is
erased.
Power was
switched on for
the first time in
the absolute
position
detection
system.
Definition
1. Power input lines and servo motor power lines are
in contact. (Power input lines and servo motor
power lines are in contact with the main circuit
terminal block (TE1). )
2. A ground fault or short occurred at the servo motor
power cable.
(A ground fault or short due to the deterioration of
insulator.)
3. Servo amplifier fault.
<Check method>
The alarm occurs even if servo motor power lines
are disconnected from the power output (U, V, and
W).
4. Servo motor fault.
<Check method>
The alarm does not occur when the power is
switched on after disconnection of servo motor
power lines in servo motor side terminal.
5. Malfunction of external dynamic brake.
<Check method>
The alarm does not occur when the power is
switched on after disconnection of servo motor
power lines in external dynamic brake-side terminal.
6. External noise caused the overcurrent detection
circuit to misoperate.
<Check method>
1. Check if the environment is affected by the noise
of surrounding electromagnetic valve, magnetic
contactor, relay, etc.
2. Check the servo amplifier and servo motor for
grounding.
1. Voltage drop in encoder
(Battery disconnected.)
2. Battery voltage low
3. Battery connector is loosely connected or battery
is faulty.
4. Encoder cable is faulty.
5. Encoder fault.
Home position not set.
Cause
16 - 109
(Note 2)
Alarm
Action
detailed
information
Connect correctly.
Repair the cable.
Change the servo
amplifier.
Change the servo
motor.
1. Check the parameter
and dynamic brake
sequence.
2. Change the external
dynamic brake.
Take the grounding and
noise reduction
techniques.
Connect the battery and
make home position
setting again.
Change the battery.
Always make home
position setting again.
Repair or replace the
encoder cable.
Change the servo
motor.
Connect the battery and
make home position
setting again.