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3. SIGNALS AND WIRING
3.5 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.
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 from off to on, press the "SET" button on the current alarm screen, or turn
the reset signal (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
1s
Brake operation
50ms or more
60ms or more
Alarm occurs.
Remove cause of trouble.
Brake operation
Power off
Power on
Valid
Invalid
Main circuit
control circuit
power supply
Base circuit
Dynamic brake
Servo-on
(SON)
Reset
(RES)
Ready
(RD)
Trouble
(ALM)
(1) Overcurrent, overload 1 or overload 2
If operation is repeated by switching control circuit power off, then on to reset the overcurrent
(AL.32), overload 1 (AL.50) or overload 2 (AL.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
(AL.30) alarm after its occurrence, the external regenerative brake resistor will generate heat,
resulting in an accident.
(3) Instantaneous power failure
Undervoltage (AL.10) occurs if power is restored after a 60ms or longer power failure of the
control power supply or after a drop of the bus voltage to or below 200VDC. If the power failure
persists further, the control power switches off. When the power failure is reset in this state, the
alarm is reset and the servo motor will start suddenly if the servo-on signal (SON) is on. To
prevent hazard, make up a sequence which will switch off the servo-on signal (SON) if an alarm
occurs.
(4) In position control mode (incremental)
When an alarm occurs, the home position is lost. When resuming operation after deactivating
the alarm, make a home position return.