Mitsubishi Electronics MR-J3 ユーザーズマニュアル
11 - 5
11. TROUBLESHOOTING
Display Name
Definition
Cause
Action
1. Faulty parts in the servo amplifier
Checking method
Alarm (A15) occurs if power is
switched on after disconnection
of all cables but the control circuit
power supply cables.
switched on after disconnection
of all cables but the control circuit
power supply cables.
A15 Memory
error
2
(EEP-ROM)
EEP-ROM fault
2. The number of write times to EEP-
ROM exceeded 100,000.
Change the servo amplifier.
1. Encoder connector (CN2)
disconnected.
Connect correctly.
2. Encoder fault
Change the servo motor.
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change the cable.
A16 Encoder
error
1
(At power on)
Communication error
occurred between
encoder and servo
amplifier.
occurred between
encoder and servo
amplifier.
4. Encoder cable type (2-wire, 4-wire)
selection was wrong in parameter
setting.
setting.
Correct the setting in the fourth digit of
parameter No.PC22.
parameter No.PC22.
A17 Board
error CPU/parts
fault
A19 Memory
error
3
(Flash ROM)
ROM memory fault
Faulty parts in the servo amplifier
Checking method
Alarm (A17 or A19) occurs if
power is switched on after
disconnection of all cables but the
control circuit power supply cable.
power is switched on after
disconnection of all cables but the
control circuit power supply cable.
Change the servo amplifier.
A1A Motor
combination
error
error
Wrong combination
of servo amplifier
and servo motor.
of servo amplifier
and servo motor.
Wrong combination of servo amplifier
and servo motor connected.
and servo motor connected.
Use correct combination.
1. Encoder connector (CN2)
disconnected.
Connect correctly.
2. Encoder cable faulty
(Wire breakage or shorted)
Repair or change the cable.
A20
Encoder error 2 Communication error
occurred between
encoder and servo
amplifier.
encoder and servo
amplifier.
3. Encoder fault
Change the servo motor.
1. Power input wires and servo motor
power wires are in contact.
Connect correctly.
2. Sheathes of servo motor power
cables deteriorated, resulting in
ground fault.
ground fault.
Change the cable.
A24
Main circuit error Ground fault
occurred at the servo
motor power (U,V
and W phases) of
the servo amplifier.
motor power (U,V
and W phases) of
the servo amplifier.
3. Main circuit of servo amplifier failed.
Checking method
Alarm (A24) occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
Change the servo amplifier.
1. Voltage drop in encoder
(Battery disconnected.)
After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.
minutes, switch power off, then on again.
Always make home position setting again.
2. Battery voltage low
Absolute position
data in error
data in error
3. Battery cable or battery is faulty.
Change the battery.
Always make home position setting again.
Always make home position setting again.
A25 Absolute
position erase
Power was switched
on for the first time in
the absolute position
detection system.
on for the first time in
the absolute position
detection system.
4. Home position not set.
After leaving the alarm occurring for a few
minutes, switch power off, then on again.
Always make home position setting again.
minutes, switch power off, then on again.
Always make home position setting again.