Mitsubishi Electric MELSERVO MRJ2S-B, Instruction Manual

Page: 153 / 200

Alarms and Warnings Troubleshooting
MELSERVO J2-Super 9 - 5
Display Error Definition Cause Action
25 Absolute position
erase Absolute position
data in error 1. Battery voltage low Change battery
Always make home
position setting
again
2. Battery cable or battery is faulty.
Power was switched
on for the first time in
the absolute position
detection system. 3. Capacitor of the absolute position
encoder is not charged. After leaving the
alarm occurring for
a few minutes,
switch power off,
then on again.
Always make home
position setting
again.
30 Regenerative
error Permissible
regenerative power
of the built-in
regenerative brake
resistor or
regenerative brake
option is exceeded. 1. Parameter No. 2 setting error Set correctly
2. Built-in regenerative brake resistor
or regenerative brake option is not
connected.
Connect correctly
3. Short cycle time or continuous
regenerative operation caused the
permissible regenerative power of the
rege-nerative brake option to be
exceeded.
Checking method: Call the status
display and check the regenerative
load ratio.
1. Increase the
cycle time
2. Use the
regenerative brake
option of larger
capacity.
3. Reduce the load.
4. Power supply voltage rose above
260V (servo amplifier 200V) and 535V
(servo amplifier 400V) or more,
respecively. Connect the units to
the correct power
supply
5. Built-in regenerative brake resistor
or regenerative brake option faulty. Change servo
amplifier or
regenerative brake
option
Regenerative
transistor fault
6. Regenerative transistor faulty
Checking method: 1. The regenerative
brake option has overheated
abnormally.
2. The alarm occurs even after
removal of the built-in regenerative
brake resistor or regenerative brake
option.
Change the servo
amplifier
Built-in regenerative brake resistor or
regenerative brake option faulty.
31 Overspeed Speed has exceeded
the instantaneous
permissible speed. 1. Small acceleration/deceleration time
constant caused overshoot to be large. Increase
acceleration/
deceleration time
constant
2. Servo system is instable to cause
overshoot. Optimise control
parameter
3. Encoder faulty Change the servo
motor
Tab. 9-2: Failure corrective action (2)