Yaskawa FSP Amplifier - Manual (Page 138)

FSP Amplifier User’s Manual Chapter 5: Parameter Settings and Functions
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To use the /NEAR signal, an output terminal must be allocated with the
parameter below.
Parameter Signal Setting Control Mode
Pn510
Output Signal
Selections 3
Default Setting: 0000 Position Control
5.5.8. Handling Power Loss
The following parameter is used to specify whether to generate an alarm
when power loss occurs.
Parameter Signal Setting (ms) Control Mode
Pn509 Momentary Hold Time
Range: 20 to 1000
Default Setting: 20
Speed, Torque,
Position Control, and
Programming
The servo amplifier turns the servomotor OFF if it detects a voltage drop in
the power supply. The default setting of 20 ms means that servomotor
operation will continue if power is lost for less than 20 ms.
In the following instances, however, either a servo alarm is generated or
control is lost (equivalent to normal power OFF operation) regardless of
the parameter setting.
• When an insufficient voltage alarm (A.41) occurs during power loss
with a large servomotor load.
• Loss of the control power supply is equivalent to normal power OFF
operation, thus control is lost.
In power loss detection, the status of the main circuit power supply is
detected and OFF status is ignored so that the servomotor’s operation will
continue if motor power turns back ON within the time set at user constant
Pn509.
Time
Power supply
voltage
t OFF
Power loss
1 . Pn509 setting t > t OFF
2 . Pn509 setting t < t OFF
For 1.
For 2.
Servo ON
Servo ON
Servo OFF
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