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9. TROUBLESHOOTING
Display Name Definition Cause Action
(Note 2)
Alarm details
AL.33 Overvoltage Bus voltage
exceeded to
following voltage.
MR-J3-
A(1):
400VDC or more
MR-J3-
A4:
800VDC or more
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.
4. 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.
5. Capacity of built-in regenerative
resistor or regenerative option is
insufficient.
Add regenerative option or
increase capacity.
6. The jumper across BUE-SD of the FR-
BU2 brake unit is removed.
Fit the jumper across BUE-
SD.
7. Impedance at main circuit power
supply cable (L
1
, L
2
, L
3
) is high, and
leak current from servo motor power
supply cable (U, V, W) is large.
Use the regenerative option.
8. Ground fault occurred in servo motor
power (U, V, W).
Correct the wiring.
9. Power supply voltage high. Check the power supply.
10. Servo amplifier fault.
(Regenerative transistor fault.)
Change the servo amplifier.
AL.35 Command pulse
frequency error
Input pulse
frequency of the
command pulse is
too high.
1. Frequency of the command pulse is
too high.
Change the command pulse
frequency to a lower value.
2. Noise entered command pulses. Take action against noise.
3. Command device failure Change the command
device.
AL.37 Parameter
error
Parameter setting
is incorrect.
1. Regenerative option not used with
servo amplifier was selected in
parameter No.PA02.
Set parameter No.PA02
correctly.
2
2. For a drive unit of MR-J3-DU30KA or
higher, parameter No.PC22 is set to
"
1 (Valid)".
Set parameter No.PC22 to
"
0 (Invalid)" and turn
the power off then on.
3. The number of write times to EEP-
ROM exceeded 100,000 due to
parameter write, etc.
Change the servo amplifier. 1, 2
4. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier.