Mitsubishi Electric Melservo MR-J3-A Instruction Manual page 246

9. TROUBLESHOOTING
Display Name
AL.32 Overcurrent
AL.33 Overvoltage
AL.35 Command
pulse frequency
error
AL.37 Parameter error Parameter setting is
Definition
Current that flew is 1. Short occurred in servo motor
higher than the power (U, V, W).
permissible current
2. Transistor (IPM IGBT) of the
of the servo
servo amplifier faulty.
amplifier. (When
the alarm (AL.32) Alarm (AL.32) occurs if power is
switched on after U,V and W are
occurs, switch the
disconnected.
power OFF and
then ON to reset
3. Ground fault occurred in servo
the alarm. Then,
motor power (U, V, W).
turn on the servo-
4. External noise caused the
on. When the alarm
overcurrent detection circuit to
(AL.32) still occurs
misoperate.
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.)
Converter bus 1. Regenerative option is not used.
voltage input value 2. Though the regenerative option is
used, the parameter No.PA02
has become the
setting is "
following.
MR-J3- A(1): 3. Lead of built-in regenerative
400VDC or more resistor or regenerative option is
MR-J3- A4: open or disconnected.
800VDC or more
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
motor power (U, V, W).
Input pulse 1. Pulse frequency of the command
frequency of the pulse is too high.
command pulse is
2. Noise entered command pulses.
too high.
3. Command device failure
1. Servo amplifier fault caused the
wrong. parameter setting to be rewritten.
2. Regenerative option not used with
servo amplifier was selected in
parameter No.PA02.
3. The number of write times to EEP-
ROM exceeded 100,000 due to
parameter write, etc.
Cause
Checking method
00 (not used)".
9 - 5
Action
Correct the wiring.
Change the servo amplifier.
Correct the wiring.
Take noise suppression measures.
Use the regenerative option.
Set correctly.
1. Change lead.
2. Connect correctly.
Change servo amplifier
1. For wire breakage of built-in
regenerative resistor, change servo
amplifier.
2. For wire breakage of regenerative
option, change regenerative option.
Add regenerative option or increase
capacity.
Review the power supply.
Correct the wiring.
Change the command pulse frequency to a
proper value.
Take action against noise.
Change the command device.
Change the servo amplifier.
Set parameter No.PA02 correctly.
Change the servo amplifier.