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3. WIRING
3 - 6 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. At this time, 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.
power supply
ON
OFF
Base circuit
ON
OFF
Dynamic brake
Valid
Invalid
Servo on
ON
OFF
(SON)
Alarm
Absent
Present
Reset command
ON
OFF
(from controller)
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 (32),
overload 1 (50) or overload 2 (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 (30)
alarm after its occurrence, the external regenerative brake resistor will generate heat, resulting in
an accident.
3) Instantaneous power failure
Undervoltage (10) occurs if power is restored after a 100ms 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 amplifier returns to the initial state.
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.
Brake operation
1s
Alarm occurs.
Remove cause of trouble.
50ms or
more
3 - 32
Power off
Power on
Brake operation
Undervoltage alarm
15ms or more
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