Mitsubishi Electric MR-J2S-CP Instruction Manual page 236

11. TROUBLESHOOTING
Display Name
AL.30 Regenerative Permissible
error regenerative power
of the built-in
regenerative resistor
or regenerative
option is exceeded.
Regenerative
transistor fault
AL.31 Overspeed Speed has exceeded
the instantaneous
permissible speed.
Definition
1. Wrong setting of parameter No. 0
2. Built-in regenerative resistor or
regenerative option is not
connected.
3. High-duty operation or continuous
regenerative operation caused the
permissible regenerative power of
the regenerative option to be
exceeded.
Call the status display and check
the regenerative load ratio.
4. Power supply voltage is abnormal.
MR-J2S- CP:260VAC or more
MR-J2S- CP1:135VAC or more
5. Built-in regenerative resistor or
regenerative option faulty.
6. Regenerative transistor faulty.
1) The regenerative option has
overheated abnormally.
2) The alarm occurs even after
removal of the built-in
regenerative resistor or
regenerative option.
1. Input command pulse frequency
exceeded the permissible
instantaneous speed frequency.
2. Small acceleration/deceleration
time constant caused overshoot to
be large.
3. Servo system is instable to cause
overshoot.
4. Electronic gear ratio is large
(parameters No. 4, 5)
5. Encoder faulty.
Cause
Checking method
Checking method
11 - 5
Action
Set correctly.
Connect correctly
1. Reduce the frequency of positioning.
2. Use the regenerative option of larger
capacity.
3. Reduce the load.
Review power supply
Change servo amplifier or regenerative
option.
Change the servo amplifier.
Set command pulses correctly.
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.