Mitsubishi Electric MELSERVO MRJ2S-B, Instruction Manual

Page: 151 / 200

Alarms and Warnings Troubleshooting
MELSERVO J2-Super 9 - 3
9.1.2 Alarms
Tab. 9-2
Prcautions at alarm occurrence:
m
DANGER:
When any alarm has occurred, eliminate its cause, ensure safety, then reset the alarm,
and restart operation. Otherwise, injury may occur.
If an absolute position erase alarm (25) occurred, always make home position setting
again. Otherwise, misoperation may occur.
b
CAUTION:
When any of the following alarms has occurred, always remove its cause and allow
about 30 minutes for cooling the servo amplifier, servo motor and
brake unit before resuming operation:
●
Regenerative error (30)
●
Overload 1 (50)
●
Overload 2 (51)
If operation is resumed by switching control circuit power off, then on to reset the
alarm, the servo amplifier, servo motor and regenerative brake resistor may become
faulty.
m
DANGER:
Brief interruption in power
If there is a loss of power lasting for longer than 60 ms, then power loss alarm (10) is
issued. If the loss of power continues for longer than another 20 ms, then the control
loop is switched off. If in this situation the voltage comes up again and at the same
time a signal “Servo ON” exists, then this would cause the servo motor to restart in an
uncontrolled manner. To prevent this from occurring you must provide a circuit
arrangement that immediately switches off a “Servo ON” signal if an alarm happens.
NOTE When an alarm occurs, the dynamic brake is operated to stop the servo motor. At this time,
the display indicates the alarm No. The setup-software may be used to refer to the cause of
alarm.