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5.5 Forming a Protective Sequence
5 -79
5.5.9 Handling Power Loss
The following user constant is used to specify whether the Servomotor holds or continues when
a power loss occurs.
Pn509
Momentary Hold Time
Unit:
ms
Setting
Range:
20 to 1000
Factory
Setting:
20
Speed/Torque
Control,
Position Control
The Servopack turnsthe Servomotor OFFif it detectsan instantaneousvoltage drop in thepower
supply. This factory setting of 20 ms means that Servomotor operation will continue if power
is lost for less than 20 ms.
In the following instances, however, a Servo alarm is generated or control is lost (equivalent to
normal power OFF operation) regardless of the user constant setting.
D
When an insufficient voltage alarm (A.41) occursduring power loss with a large Servomotor
load.
D
When control is lost (equivalent to normal power OFF operation) with loss of the control
power supply.
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 at user constant Pn509.
Power supply
voltage
Power loss
t OFF
Time
Servo ON
Servo OFF
1.
Pn509 setting > t OFF
2.
Pn509 setting t < t OFF
Servo ON
For
1.
For
2.
5
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