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5 Operation
5.2.9 SEMI F47 Function (Force Limit Function for Low DC Power Supply Voltage for Main Circuit)
5-18
(1) Execution Method
This function can be executed either with the host controller and the SERVOPACK or with the SERVOPACK
only.
With the Host Controller and the SERVOPACK
The host controller limits the force in response to an undervoltage warning.
The host controller removes the force limit aft
er the undervoltage warning is cleared.
560 V for 400-V power supply.
400 V for 400-V power supply.
With the SERVOPACK only
The force is limited in the SERVOPACK in response to an undervoltage warning.
The SERVOPACK controls the force limit valu
e in the set time after the undervoltage warning is cleared. Use
Pn008.1 to specify whether the function is executed by the host controller and SERVOPACK or by the SER-
VOPACK only.
560 V for 400-V power supply.
400 V for 400-V power supply.
280 V
*
1
200 V
*
2
0%
0%
Main circuit power interruption time
Main circuit
input power supply
Main circuit
bus voltage
Undervoltage
warning detected
Force limit
reference
Undervoltage
warning
Force limit
SERVOPACK
Host
controller
Force limit starts.
Main circuit bus voltage
increases by recovery
of the main circuit power.
Main circuit bus voltage drops slowly
because output force is limited.
The force is limited in
response to an under-
voltage warning.
Force limit ends.
280 V
*1
200 V
*2
0%
Main circuit power interruption time
Main circuit
input power supply
Main circuit
bus voltage
Undervoltage
warning detected
Force limit starts.
Setting value for Pn424
Setting value for Pn425
Force limit
SERVOPACK
Main circuit bus voltage
increases by recovery
of the main circuit power.
Main circuit
bus voltage drops slowly because
output force is limited.
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