Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

Page: 662 / 802

16 - 107
16. INDEXER POSITIONING OPERATION
Display Name Definition Cause Action
(Note 2)
Alarm
detailed
information
A16 Encoder error
1 (At power
on)
Communication
error occurred
between
encoder and
servo amplifier. 1. Encoder connector (CN2) is disconnected. Connect correctly. 44
2. A wrong type of encoder cable (2-wire/4-wire) was
selected in parameter setting.
Correct the setting in
the fourth digit of
parameter No.PC22.
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change the
cable.
4. Encoder fault. Change the servo
motor.
5. Servo motor other than that of MR-J3 series was
connected.
Check the combination
of servo amplifier and
servo motor. 63
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.
Take the grounding
and noise reduction
techniques.
A17 Board error CPU/parts fault 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.
Change the servo
amplifier.
A19 Memory error
3 (Flash
ROM)
ROM memory
fault
A1A Motor
combination
error
Wrong
combination of
servo amplifier
and servo
motor.
Wrong combination of servo amplifier and servo
motor connected. Check the combination
of the servo amplifier
and the servo motor.