Instruction manual

3. SIGNALS AND WIRING
3.5 Alarm Occurrence Timing Chart
When an alarm has occurred, remove its cause, make sure that the operation
&AUTION signal is not being input, ensure safety, and reset the alarm before restarting
operation.
When an alarm occurs in the servo ampMer, 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.
power supply ON
OFF I
lPower Off t Power on I
Base circuit
Dynamic brake
more
Remove cause of trouble.
Precautions for alarm occurrence
1) Overcurrent, overload 1 or overload 2
If operation is repeated by switchmg 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 amphfier and servo motor may become faulty due to temperature rise. Securely remove
the cause of the alarm and also allow about 15 minutes for coohg before resuming operation.
2) Instantaneous power failure
If a power fadure continues 15ms or longer, the undervoltage (A. 10) alarm will occur. If the
power fadure stdl persists for 20ms or longer, the control circuit is switched off. When the power
failure is reset in ths state, the alarm is reset and the servo motor wlll start suddenly if the
servo-on signal (SON) is on. To prevent hazard, make up a sequence which wdl switch off the
servo-on signal (SON) if an alarm occurs.
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.
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