Alarm Occurrence Timing Chart - Mitsubishi Electric MELSERVO-J2 Series Instruction Manual

3. SIGNALS AND WIRING

3.5 Alarm occurrence timing chart

CAUTION
When an alarm occurs in the servo amplifier, the base circuit is shut off and the servo motor is coated to a
stop. Switch off the main circuit power supply in the external sequence. To reset the alarm, switch the
control circuit power supply off, then on.
However, the alarm cannot be reset unless its cause of occurrence is removed.
(Note)
Power supply
Base circuit
Dynamic brake
Servo-on
(SON)
Ready
(RD)
Trouble
(ALM)
Reset
(RES)
Note. Shut off the main circuit power as soon as an alarm occurs.
Precautions for alarm occurrence
1) Overcurrent, overload 1 or overload 2
If operation is repeated by switching control circuit power off, then on to reset the overcurrent
(A.32), overload 1 (A.50) or overload 2 (A.51) alarm after its occurrence, without removing its cause,
the servo amplifier and servo motor may become faulty due to temperature rise. Securely remove
the cause of the alarm and also allow about 30 minutes for cooling before resuming operation.
2) Regenerative alarm
If operation is repeated by switching control circuit power off, then on to reset the regenerative
(A.30) alarm after its occurrence, the external regenerative brake resistor will generate heat,
resulting in an accident.
3) Instantaneous power failure
Undervoltage (A.10) occurs when the input power is in either of the following statuses.
A power failure of the control circuit power supply continues for 100ms or longer and the control
circuit is not completely off.
The bus voltage dropped to 200VDC or less.
4) Incremental system
When an alarm occurs, the home position is lost. When resuming operation after deactivating the
alarm, make a return to home position.
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When an alarm has occurred, remove its cause, make sure that the operation
signal is not being input, ensure safety, and reset the alarm before restarting
operation.
As soon as an alarm occurs, turn off Servo-on (SON) and power off.
ON
OFF
ON
OFF
Valid
Invalid
ON
OFF
ON
OFF
ON
OFF
0.8s
ON
OFF
Alarm occurs.
Remove cause of trouble.
search engine
Brake operation
50ms or
more
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Power off
Power on
Brake operation
Instantaneous power failure alarm
100ms or more