Mitsubishi Electric MELSERVO-J2 Series Instruction Manual page 205

11. TROUBLESHOOTING
Display
A.15 Memory error 2
A.16 Encoder error 1
A.17 Board error 2
A.19 Memory error 3
A.20 Encoder error 2
A.24 Main circuit
error
A.25 Absolute position
erase
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Name Definition
EEP-ROM fault
Communication
error occurred
between encoder and
servo amplifier.
CPU/parts fault
The output terminals
U, V, W of the servo
amplifier and the
input terminals U, V,
W of the servo motor
are not connected.
ROM memory fault
Communication
error occurred
between encoder and
servo amplifier.
Ground fault
occurred at the servo
motor outputs (U,V
and W phases) of the
servo amplififer.
Absolute position
data in error
Power was switched
on for the first time
in the absolute
position detection
system.
search engine
Cause
1. Faulty parts in the servo amplifier
Checking method
Alarm (A.15) 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.
1. Encode connector (CN2) disconnected.
2. Encoder fault
3. Encoder cable faulty
(wire breakage or short)
4. Wrong combination of servo amplifier
and servo motor
1. Faulty parts in the servo amplifier.
Checking method
Alarm (A.17) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
2. The wiring of U, V, W is disconnected
or not connected.
Faulty parts in the servo amplifier.
Checking method
Alarm (A.19) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
1. Encoder connector (CN2) disconnected.
2. Encoder fault
3. Encoder cable faulty
(wire breakage or short)
1. Power input wires and servo motor
output wires are in contact at main
circuit terminal block (TE1).
2. Sheathes of servo motor power cables
deteriorated, resulting in ground fault.
3. Main circuit of servo amplifier failed.
Checking method
AL.24 occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
1. Reduced voltage of super capacitor in
encoder
2. Battery voltage low
3. Battery cable or battery is faulty.
4. Super capacitor of absolute position
encoder is not charged.
11 - 4
Action
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change the cable.
Use correct combination.
Change the servo amplifier.
Correctly connect the output
terminals U, V, W of the servo
amplifier and the input
terminals U, V, W of the servo
motor.
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change the cable.
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.