Mitsubishi Electric MELSERVO MR-J3-xT Instruction Manual page 329

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
A20 Encoder error 2 Communication error
A24 Main circuit error Ground fault
A25 Absolute
position erase
Definition
EEP-ROM fault 1. Faulty parts in the servo amplifier
Alarm (A15)
occurs if power is switched on
after disconnection of all cables
but the control circuit power
supply cables.
2. The number of write times to EEP-
ROM exceeded 100,000.
Communication error 1. Encoder connector (CN2)
occurred between disconnected.
encoder and servo
2. Encoder fault
amplifier.
3. Encoder cable faulty
(Wire breakage or shorted)
4. Encoder cable type (2-wire, 4-wire)
selection was wrong in parameter
setting.
CPU/parts fault
Faulty parts in the servo amplifier
ROM memory fault
Alarm (A17 or A19) occurs if
power is switched on after
disconnection of all cables but the
control circuit power supply cable.
Wrong combination Wrong combination of servo amplifier
of servo anplifier and and servo motor connected.
servo motor.
1. Encoder connector (CN2)
occurred between disconnected.
encoder and servo
2. Encoder cable faulty
amplifier.
(Wire breakage or shorted)
3. Encoder fault
1. Power input wires and servo motor
occurred at the servo power wires are in contact.
motor power (U,V
2. Sheathes of servo motor power
and W phases) of
cables deteriorated, resulting in
the servo amplififer.
ground fault.
3. Main circuit of servo amplifier failed.
A24 occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
Absolute position 1. Voltage drop in encoder
data in error (Battery disconnected.)
2. Battery voltage low
3. Battery cable or battery is faulty.
Power was switched 4. Home position not set.
on for the first time in
the absolute position
detection system.
Cause
Checking method
Checking method
Checking method
11 - 5
Action
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change cable.
Correct the setting in the fourth digit of
parameter No. PC22.
Change the servo amplifier.
Use correct combination.
Connect correctly.
Repair or change the cable.
Change the servo motor.
Connect correctly.
Change the cable.
Change the servo amplifier.
After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.
Change battery.
Always make home position setting again.
After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.