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11. TROUBLESHOOTING
Display Name
Definition Cause
Action
1. Short occurred in servo motor power
(U, V, W).
Correct the wiring. A32 Overcurrent
2. Transistor (IPM, IGBT) of the servo
amplifier faulty.
Checking method
Alarm (A32) occurs if power is
switched on after U,V and W are
disconnected.
Change the servo amplifier.
3. Ground fault occurred in servo motor
power (U, V, W).
Correct the wiring.
Current that flew is
higher than the
permissible current
of the servo
amplifier. (If the
alarm (A32) occurs
again when turning
ON the servo after
resetting the alarm
by turning OFF/ON
the power when the
alarm (A32) first
occurred, the
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”.)
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression measures.
A33 Overvoltage 1. Regenerative option is not used. Use the regenerative option.
2. Though the regenerative option is
used, the parameter No.PA02
setting is "
00 (not used)".
Set correctly.
3. Lead of built-in regenerative resistor
or regenerative option is open or
disconnected.
1. Change the lead.
2. Connect correctly.
The following shows
the input value of
converter bus
voltage.
MR-J3-
T(1):
400VDC or more
MR-J3-
T4:
800VDC or more
4. Regenerative transistor faulty. Change the servo amplifier
5. Wire breakage of built-in
regenerative resistor or regenerative
option.
1. For wire breakage of built-in regenerative
resistor, change the servo amplifier.
2. For wire breakage of regenerative option,
change the regenerative option.
6. Capacity of built-in regenerative
resistor or regenerative option is
insufficient.
Add regenerative option or increase
capacity.
7. Power supply voltage high. Check the power supply.
8. Ground fault occurred in servo motor
power (U, V, W).
Correct the wiring.
9. The jumper across BUE-SD of the
FR-BU2 brake unit is removed.
Fit the jumper across BUE-SD.
A35 Command pulse
frequency error
1. Pulse frequency of the manual pulse
generator is too high.
Change the pulse frequency to a proper
value.
Input pulse
frequency of the
command pulse is
too high.
2. Noise entered the pulses of the
manual pulse generator.
Take action against noise.
3. Manual pulse generator failure. Change the manual pulse generator.