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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, make the Servo off status and interrupt the main
circuit power.
When an alarm occurs in each unit, 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 deactivate the alarm, power the
control circuit off, then on or give the error reset or CPU reset command from the servo system controller.
However, the alarm cannot be deactivated unless its cause is removed.
ON
OFF
ON
OFF
ON
OFF
NO
YES
ON
OFF
4s
NO
YES
Main circuit
Control circuit
power
Base circuit
Dynamic brake
Servo-on command
(from controller)
Alarm
Reset command
(from controller)
Valid
Invalid
Alarm occurs.
Remove cause of trouble.
50ms or more 30ms or more
NO
Brake operation
Brake operation
Power on
Power off
(Note)
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), overload 2 (A.51) or multi axis overload (A.53) alarm after its occurrence, without
removing its cause, each unit 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.