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3. SIGNALS AND WIRING
3.5 Alarm Occurrence Timing Chart
CAUTION
y
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.
y
As soon as an alarm occurs, turn off Servo-on (SON) and power off the main
circuit.
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.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Main circuit
control circuit
power supply
Base circuit
Dynamic brake
Servo-on
(SON)
Reset
(RES)
Ready
(RD)
Trouble
(ALM)
(Note 3)
Brake operation
50ms or more
15 to 40ms (Note 2)
Alarm occurs.
Remove cause of trouble.
Brake operation
Power off
Power on
(Note 1)
Valid
Invalid
Note 1. At an occurrence of the overcurrent(A.32) alarm and a power failure of the control circuit power supply 40ms or more,
the dynamic brake cannot be operated.
2. Changes depending on the operating status.
3. Shut 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 15 minutes for cooling before resuming operation.
(2) 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 40ms or longer and the control
circuit is not completely off.
The bus voltage dropped to 15VDC.
(3) Position control mode
When an alarm occurs, the home position is lost. When resuming operation after deactivating the
alarm, make a return to home position.