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