Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 665

16. INDEXER POSITIONING OPERATION
Display Name
Regenerative Permissible
A30
error regenerative
power of the
built-in
regenerative
resistor or
regenerative
option is
exceeded.
Regenerative
transistor fault
Overspeed Speed has
A31
exceeded the
instantaneous
permissible
speed.
Definition
1.Wrong setting of parameter No. PA02
2. High-duty operation or continuous regenerative
operation caused the permissible regenerative
power of the regenerative option to be 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.
6. Servo amplifier fault. (Regenerative transistor is
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)
1. Small acceleration/deceleration time constant
caused overshoot to be large.
2. Servo system is instable to cause overshoot.
3. Electronic gear ratio is large
(parameters No.PA06, PA07)
4. Encoder faulty.
Cause
16 - 110
(Note 2)
Action
detailed
information
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.
Alarm
1
4
2