8 Operation
8.3.6 Instantaneous Power Loss Settings
8-26
8.3.6 Instantaneous Power Loss Settings
Determines whether to continue operation or turn the servo OFF when the power supply voltage to the SERVO-
PACK main circuit is instantaneously interrupted.
Pn509 Instantaneous Power Cut Hold Time
Setting Range Setting Unit Factory Setting Setting Validation
20 to 1000 1 ms 20 Immediately
In power loss detection, the status of the main circuit power supply is detected and OFF status is ignored so servomotor
operation will continue if the servomotor turns back ON within the time set in parameter Pn509.
In the following instances, however, the parameter setting
will be invalid.
• If an insufficient voltage alarm (A.41) occurs during a
power loss with a large servomotor load.
• When control is lost (equivalent to normal power OFF
operation) with loss of the control power supply.
IMPORTANT
The maximum setting for the hold time during a power
loss is 1,000 ms, but the hold time for the SERVOPACK
control power supply is about 100 ms. The hold time for
the main circuit power supply depends on the
SERVOPACK output.
To continue SERVOPACK operation for a power loss that is longer than this, provide an uninterruptible power supply.
Speed
Position
Torque
Power
supply
voltage
Instantaneous power interruption
OFF time t
Servo ON
Servo ON
Servo OFF
Pn509 > t
Pn509 < t
Operation
continued
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