11 - 8
11. TROUBLESHOOTING
Display Name
Definition
Cause
Action
(Note 2)
Alarm
detailed
information
A24 Main
circuit
error
Ground fault
occurred at the
servo motor
poweroutput (U, V
and W).
1. Power input lines and servo motor
power lines are in contact. (Power
input lines and servo motor power
lines are in contact with main circuit
terminal block (TE1). )
Connect correctly.
2. A ground fault or short occurred with
the servo motor power cable.
(A ground fault or short due to the
deterioration of insulator.)
Repair the cable.
3. Servo motor fault.
<Check method>
The alarm occurs even when the
servo motor power lines are
disconnected from the power output
(U, V, and W).
Change the servo amplifier.
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.
Change the servo motor.
5. Malfunction of external dynamic
brake.
<Check method>
The alarm does not occur if power is
switched on after disconnection of
servo motor power lines in external
dynamic brake-side terminal.
1. Check the parameter and
dynamic brake
sequence.
2. Replace the external
dynamic brake
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.
Take the grounding and
noise reduction techniques.
A25 Absolute
position erase
Absolute position
data is erased.
1. Voltage drop in encoder
(Battery disconnected.)
Connect the battery and
make home position setting
again.
2. Battery voltage low
Change the battery.
Always make home position
setting again.
3. Battery connector is loosely
connected or battery is faulty.
4. Encoder cable is faulty.
Repair or replace
theencoder cable.
5. Encoder fault.
Change the servo motor.
Power was
switched on for the
first time in the
absolute position
detection system.
Home position not set.
Connect the battery and
make home position setting
again.
Summary of Contents for Melservo-J3 Series MR-J3-B
Page 19: ...10 MEMO ...
Page 55: ...1 36 1 FUNCTIONS AND CONFIGURATION MEMO ...
Page 61: ...2 6 2 INSTALLATION MEMO ...
Page 179: ...4 58 4 SIGNALS AND WIRING MEMO ...
Page 241: ...5 62 5 OPERATION MEMO ...
Page 357: ...10 16 10 SPECIAL ADJUSTMENT FUNCTIONS MEMO ...
Page 385: ...11 28 11 TROUBLESHOOTING MEMO ...
Page 397: ...12 12 12 OUTLINE DRAWINGS MEMO ...
Page 755: ...17 70 17 SPEED CONTROL OPERATION MEMO ...
Page 793: ...App 38 APPENDIX MEMO ...
Page 799: ...MEMO ...