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3. SIGNALS AND WIRING
3.6 Alarm occurrence timing chart
CAUTION
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 the main
circuit.
When an alarm occurs in the MELSERVO-J2M, 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 from off to on, or turn the reset (RES
) from off to on. However,
the alarm cannot be reset unless its cause is removed.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
3s
Brake operation
50ms or more
30ms or more
Alarm occurs.
Remove cause of trouble.
Brake operation
Power off Power on
Valid
Invalid
(Note)
Main circuit
control circuit
power supply
Base circuit
Dynamic brake
Servo-on
(SON )
Reset
(RES )
Ready
(RD )
Trouble
(ALM_ )
Note. Switch off the main circuit power as soon as an alarm occurs.
(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 30ms or longer and the control
circuit is not completely off.
The bus voltage dropped to 200VDC or less.
(4) Incremental
When an alarm occurs, the home position is lost. When resuming operation after deactivating the
alarm, make a home position return.