Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 366

11. TROUBLESHOOTING
Display Name
A30 Regenerative
error
A31 Overspeed
Definition
Permissible 1. Wrong setting of parameter No.
regenerative power PA02
of the built-in
2. High-duty operation or continuous
regenerative
regenerative operation caused the
resistor or
permissible regenerative power of
regenerative option
the regenerative option to be
is exceeded.
exceeded.
<Check method>
Check the regenerative load ratio on
the status display.
3. Power supply voltage is abnormal.
200V class: 260VAC or more
100V class: More than 135VAC
400V class: 535VAC or more
4. Built-in regenerative resistor or
regenerative option is not connected.
5. Built-in regenerative resistor or
regenerative option faulty.
Regenerative 6. Servo amplifier fault. (Regenerative
transistor fault transistor faulty.)
<Check method>
1. The regenerative option has
overheated abnormally.
2. The alarm occurs even after
removal of the built-in regenerative
resistor or regenerative option.
7. Servo amplifier fault. (Regenerative
circuit fault)
Speed has 1. Small acceleration/deceleration time
exceeded the constant caused overshoot to be
instantaneous large.
permissible speed.
2. Servo system is instable to cause
overshoot.
3. Electronic gear ratio is large
(parameters No.PA06, PA07)
4. Encoder faulty.
Cause
11 - 9
Action
Set correctly.
1. Reduce the frequency of
positioning.
2. Use the regenerative
option of larger capacity.
3. Reduce the load.
Check the power supply.
Connect correctly.
Change the servo amplifier
or regenerative option.
Change the servo
amplifier.
Change the servo
amplifier.
Increase
acceleration/deceleration
time constant.
1. Re-set servo gain to
proper value.
2. If servo gain cannot be
set to proper value.
1) Reduce load inertia
moment ratio; or
2) Reexamine
acceleration/
deceleration time
constant.
Set correctly.
Change the servo motor.
(Note 2)
Alarm
detailed
information
1
4
2