CHAPTER 3 OPERATION
3-6
Operation Check
3
3.3.4 If the Servomotor Fails to Start
If the servomotor fails to start or unexpected indication is given, it is recommended to undergo the
procedure described in “14.6.8 Diagnosis to be Made If the Servomotor Fails to Start” on page 14-34,
using PC Loader.
3.3.5 Shutdown
If the power is turned off with the servo-on signal turned on, the servo amplifier detects a low voltage
alarm.
If the DC link voltage drops below about 200 V and the power is restored within one second with the
servo-on signal being turned on, the main power undervoltage is detected. If the duration exceeds
one second, the main power undervoltage is not detected.
Even if the main power undervoltage alarm is detected, there is no effect on the servo amplifier.
However, do not repeat to turn the power on or off to start or stop the servomotor.
Repetitive power-on and shutdown will cause breakage to the servo amplifier.
If the operation command is turned off before the power is shut off, the main power undervoltage is not
detected.
Use the parameter PA2_67 (alarm detection at undervoltage) for determining the detection of main
power undervoltage, and PA2_63 (action sequence at main power shutoff) for determining the stop
action at main power shutoff.
If the power is shut off during operation, the servo amplifier turns off ready for servo-on [RDY] to stop
the internal CPU.
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