YASKAWA SGMJV User Manual page 105

(1) Execution Method
This function can be executed either with the host controller and the SERVOPACK or with the SERVOPACK
only. Use Pn008.1 to specify whether the function is executed by the host controller and SERVOPACK or by
the SERVOPACK only.
 Execution with the Host Controller (Pn008 = n.1)
The host controller limits the torque in response to an undervoltage warning.
The host controller removes the torque limit after the undervoltage warning is cleared.
Main circuit
input power supply
Main circuit
bus voltage
SERVOPACK
Undervoltage
warning detected
Torque limit
Undervoltage
warning
Host
controller
Torque limit
reference
∗1. 560 V for 400-V power supply.
∗2. 400 V for 400-V power supply.
 Execution with the SERVOPACK Only (Pn008 = n.2)
The torque is limited in the SERVOPACK in response to an undervoltage warning.
The SERVOPACK controls the torque limit value in the set time after the undervoltage warning is cleared.
Main circuit
input power supply
Main circuit
bus voltage
SERVOPACK
Undervoltage
warning detected
Torque limit
∗1. 560 V for 400-V power supply.
∗2. 400 V for 400-V power supply.
Main circuit power interruption time
*1
Main circuit bus voltage drops slowly
280 V
because output torque is limited.
*2
200 V
0%
0%
Main circuit power interruption time
*1
280 V
*2
200 V
Torque limit starts.
Setting value for Pn424
0%
Torque limit starts.
The torque is limited in
response to an under-
voltage warning.
Torque limit ends.
Main circuit bus voltage drops slowly because
output torque is limited.
4.3 Basic Functions Settings
Main circuit bus voltage
increases by recovery
of the main circuit power.
Main circuit bus voltage
increases by recovery
of the main circuit power.
Setting value for Pn425
4
4-19