Mitsubishi Electric MR-J3-10B Instruction Manual page 144

8. TROUBLESHOOTING
Display
12 Memory error 1
(RAM)
13 Clock error
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15 Memory error 2
(EEP-ROM)
16 Encoder error 1
(At power on)
17 Board error 2
19 Memory error 3
(Flash ROM)
1A Motor
combination
error
20 Encoder error 2 Communication error
24 Main circuit error Ground fault
25 Absolute
position erase
Name Definition
RAM, memory fault
Printed board fault
Clock error
transmitted from the
controller
EEP-ROM fault
Communication error
occurred between
encoder and servo
amplifier.
CPU/parts fault
ROM memory fault
Wrong combination
of servo anplifier and
servo motor.
occurred between
encoder and servo
amplifier.
occurred at the servo
motor power (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.
Cause
Faulty parts in the servo amplifier
Checking method
Alarm (any of 12 and 13)
occurs if power is switched on
after disconnection of all cables
but the control circuit power
supply cables.
Faulty controller
Checking method
Alarm(13) occurs, if servo
controller is used in multiple CPU
system.
1. Faulty parts in the servo amplifier
Checking method
Alarm (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. Encoder connector (CN2)
disconnected.
2. Encoder fault
3. Encoder cable faulty
(Wire breakage or shorted)
4. Encoder cable type (2-wire, 4-wire)
selection was wrong in parameter
setting.
Faulty parts in the servo amplifier
Checking method
Alarm (17 or 19) occurs if
power is switched on after
disconnection of all cables but the
control circuit power supply cable.
Wrong combination of servo amplifier
and servo motor connected.
1. Encoder connector (CN2)
disconnected.
2. Encoder cable faulty
(Wire breakage or shorted)
3. Encoder fault
1. Power input wires and servo motor
power wires are in contact.
2. Sheathes of servo motor power
cables deteriorated, resulting in
ground fault.
3. Main circuit of servo amplifier failed.
Checking method
(24) occurs if the servo is
switched on after disconnecting
the U, V, W power cables from
the servo amplifier.
1. Voltage drop in encoder
(Battery disconnected.)
2. Battery voltage low
3. Battery cable or battery is faulty.
4. Home position not set.
8 - 3
Action
Change the servo amplifier.
Change the servo system controller.
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change cable.
Correct the setting in the fourth digit of
parameter No. PC04.
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.