Mitsubishi Electric MELSERVO-J3 Series Manual page 356

11. TROUBLESHOOTING
Display Name
A32 Overcurrent
A33 Overvoltage
A35 Command pulse
frequency error
Definition
Current that flew is
1. Short occurred in servo motor power
higher than the
(U, V, W).
permissible current
2. Transistor (IPM, IGBT) of the servo
of the servo
amplifier faulty.
amplifier. (If the
alarm (A32) occurs
Alarm (A32) occurs if power is
again when turning
switched on after U,V and W are
ON the servo after
disconnected.
resetting the alarm
3. Ground fault occurred in servo motor
by turning OFF/ON
power (U, V, W).
the power when the
4. External noise caused the
alarm (A32) first
overcurrent detection circuit to
occurred, the
misoperate.
transistor (IPM,
IGBT) of the servo
amplifier may be at
fault. In the case, do
not repeat to turn
OFF/ON the power.
Check the transistor
with the checking
method of "Cause
2".)
The following shows 1. Regenerative option is not used.
the input value of
2. Though the regenerative option is
converter bus
used, the parameter No.PA02
voltage.
setting is "
MR-J3- T(1):
3. Lead of built-in regenerative resistor
400VDC or more
or regenerative option is open or
MR-J3- T4:
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).
9. The jumper across BUE-SD of the
FR-BU2 brake unit is removed.
Input pulse 1. Pulse frequency of the manual pulse
frequency of the generator is too high.
command pulse is
2. Noise entered the pulses of the
too high.
manual pulse generator.
3. Manual pulse generator failure.
Cause
Checking method
00 (not used)".
11 - 7
Action
Correct the wiring.
Change the servo amplifier.
Correct the wiring.
Take noise suppression measures.
Use the regenerative option.
Set correctly.
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 pulse frequency to a proper
value.
Take action against noise.
Change the manual pulse generator.