Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 363

11. TROUBLESHOOTING
Display Name
A15 Memory error 2
(EEP-ROM)
A16 Encoder error 1
(At power on)
A17 Board error
A19 Memory error 3
(Flash ROM)
A1A Motor
combination
error
Definition
EEP-ROM fault 1. Faulty parts in the servo amplifier
<Check method>
The alarm occurs even if the power is
switched on after disconnection of all
cables except the control circuit
power supply cable.
2. The number of write times to EEP-
ROM exceeded 100,000.
Communication 1. Encoder connector (CN2) is
error occurred disconnected.
between encoder
2. A wrong type of encoder cable (2-
and servo amplifier.
wire, 4-wire) was selected in
parameter setting.
3. Encoder cable faulty
(Wire breakage or shorted)
4. Encoder fault.
5. Servo motor other than that of MR-J3
series was connected.
6. External noise caused a
communication error.
<Check method>
1. Check that the encoder cable and
the power cable run in parallel.
2. Check if the environment is
affected by the noise of
surrounding electromagnetic valve,
magnetic contactor, relay, etc.
3. Check the servo amplifier and
servo motor for grounding.
4. Check if there is a factor causing
surrounding static electricity.
5. Check shield procedure of the
encoder cable.
CPU/parts fault Faulty parts in the servo amplifier.
ROM memory fault <Check method>
Alarm occurs even if the power is
switched on after disconnection of all
cables except the control circuit
power supply cable.
Wrong combination Wrong combination of servo amplifier
of servo amplifier and servo motor connected.
and servo motor.
Cause
11 - 6
Action
Change the servo amplifier.
Connect correctly.
Correct the setting in the
fourth digit of parameter
No.PC22.
Repair or change the cable.
Change the servo motor.
Check the combination of
the servo amplifier and
servo motor.
Take the grounding and
noise reduction techniques.
Change the servo amplifier.
Check the combination of
the servo amplifier and the
servo motor.
(Note 2)
Alarm
detailed
information
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