Mitsubishi melservo-j2 series Instruction Manual page 207

11. TROUBLESHOOTING
Display Name
A.17 Board error 2
A.18 Board error 3
A.20 Encoder error 2
A.24 Motor outout
ground fault
A.25 Absolute position
erase
A.30 Regenerative
alarm
Definition
CPU/parts fault Faulty parts in the servo amplifier
Printed board fault
Communication 1. Encoder connector disconnected.
error occurred
between encoder and
2. Encoder cable faulty
servo amplifier.
(wire breakage or short)
Ground fault 1. Power input cable and servo motor
occurred at the servo output cable are making contact at the
motor outputs (U,V main circuit terminal block (TE1).
and W phases) of the
2. Servo motor power cable insulation
servo amplififer.
deteriorated.
Absolute position 1. Reduced voltage of super capacitor in
data in error encoder
2. Battery voltage low
3. Battery cable or battery is faulty.
Power was switched 4. Super capacitor of absolute position
on for the first time encoder is not charged.
in the absolute
position detection
system.
Permissible 1. Wrong setting of parameter No. 0
regenerative power
2. Built in regenerative brake resistor or
of the built-in
regenerative brake option is not
regenerative brake
connected.
resistor or
3. High-duty operation or continuous
regenerative brake
regenerative operation caused the
option is exceeded.
permissible regenerative power of the
regenerative brake option to be
exceeded.
Power supply voltage is abnormal.
MR-J2- C: 260V or more
Regenerative 4. Regenerative transistor faulty.
transistor fault
5. Built-in regenerative brake resistor or
regenerative brake option faulty.
Cooling fan stop 6. Unusual overheat due to cooling fan
(MR-J2-200C•350C) stop
Cause
Checking method
Alarm (A.17 or A.18) occurs if
power is switched on after all
connectors have been
disconnected.
Checking method
Call the status display and check
the regenerative load ratio.
Checking method
1) The regenerative brake option
has overheated abnormally.
2) The alarm occurs even after
removal of the built-in
regenerative brake resistor or
regenerative brake option.
11 - 4
Action
Change the servo amplifier.
Connect correctly.
Repair or change the cable.
Connect correctly.
Change the cable.
After leaving it to stand for a
few minutes with A.25
occurring, switch power off, then
on again.
Change battery.
Make home position return
again.
After leaving it to stand for a
few minutes with A.25
occurring, switch power off, then
on again.
Set correctly.
Connect correctly
1. Reduce the frequency of
positioning.
2. Use the regenerative brake
option of larger capacity.
3. Reduce the load.
Review power supply
Change the servo amplifier.
Change servo amplifier or
regenerative brake option.
1. Change the servo amplifier or
cooling fan.
2. Reduce ambient temperature.