Mitsubishi Electric MR-J2S-A Instruction Manual page 207

10. TROUBLESHOOTING
Display Name
AL.32 Overcurrent Current that flew is
higher than the
permissible current
of the servo
amplifier. (When
the alarm (AL.32)
occurs, switch the
power OFF and
then ON to reset the
alarm. Then, turn
on the servo-on.
When the alarm
(AL.32) still occurs
at the time, the
transistor (IPM
IGBT) of the servo
amplifier may be at
fault. Do not switch
the power OFF/ON
repeatedly; check
the transistor
according to the
cause 2 checking
method.)
Current higher than
the permissible
current flew in the
regenerative
transistor.
(MR-J2S-500A only)
AL.33 Overvoltage Converter bus
voltage exceeded
400VDC.
AL.35 Command Input pulse
pulse frequency frequency of the
error command pulse is
too high.
Definition
1. Short occurred in servo amplifier
output phases U, V and W.
2. Transistor (IPM) of the servo
amplifier faulty.
Checking method
Alarm (AL.32) occurs if power is
switched on after U,V and W
are disconnected.
3. Ground fault occurred in servo
amplifier output phases U, V and
W.
4. External noise caused the
overcurrent detection circuit to
misoperate.
5. Improper wiring of the
regenerative option.
1. Regenerative option is not used.
2. Though the regenerative option is
used, the parameter No. 0 setting
is " 00 (not used)".
3. Lead of built-in regenerative
resistor or regenerative option is
open or disconnected.
4. Regenerative transistor faulty.
5. Wire breakage of built-in
regenerative resistor or
regenerative option
6. Capacity of built-in regenerative
resistor or regenerative option is
insufficient.
7. Power supply voltage high.
8. Ground fault occurred in servo
amplifier output phases U, V and
W.
9. The jumper across BUE-SD of the
FR-BU2 brake unit is removed.
1. Pulse frequency of the command
pulse is too high.
2. Noise entered command pulses.
3. Command device failure
10 - 10
WWW.NNC.IR
Cause
Correct the wiring.
Change the servo amplifier.
Correct the wiring.
Take noise suppression measures.
Wire the regenerative option correctly.
Use the regenerative option.
Make correct setting.
1. Change the lead.
2. Connect correctly.
Change the servo amplifier
1. For wire breakage of built-in
regenerative resistor, change the servo
amplifier.
2. For wire breakage of regenerative
option, change the regenerative option.
Add regenerative option or increase
capacity.
Check the power supply.
Correct the wiring.
Fit the jumper across BUE-SD.
Change the command pulse frequency to a
proper value.
Take action against noise.
Change the command device.
Action