YASKAWA SGD7S Product Manual page 202

Main circuit input
power supply
280 V
Main circuit
200 V
bus voltage
SERVOPACK
A.971 warning
(Undervoltage)
Torque
control
Related Parameters
The following parameters are related to the SEMI F47 function.
Torque Limit at Main Circuit Voltage Drop
Pn424 Setting Range
0 to 100
Release Time for Torque Limit at Main Circuit Voltage Drop
Pn425 Setting Range
0 to 1,000
Momentary Power Interruption Hold Time
Pn509 Setting Range
20 to 50,000
*
Set a percentage of the motor rated torque.
Note: If you will use the SEMI F47 function, set the time to 1,000 ms.
• This function handles momentary power interruptions for the voltage and time ranges stipu-
lated in SEMI F47. An uninterruptible power supply (UPS) is required as a backup for momen-
tary power interruptions that exceed these voltage and time ranges.
• Set the host controller or SERVOPACK torque limit so that a torque reference that exceeds the
Important
specified acceleration torque will not be output when the power supply for the main circuit is
restored.
• For a vertical axis, do not limit the torque to a value that is lower than the holding torque.
• This function limits torque within the range of the SERVOPACK's capability for power interrup-
tions. It is not intended for use under all load and operating conditions. Set the parameters
while monitoring operation on the actual machine.
• You can set the momentary power interruption hold time to increase the amount of time from
when the power supply is turned OFF until power supply to the motor is stopped. To stop the
power supply to the motor immediately, execute the Servo OFF (Enable = 0) command.
Main circuit power interruption time
The output torque is limited to suppress the
drop in the main circuit bus voltage.
Torque limit starts.
Setting of Pn424
0%
Setting Unit Default Setting
1%*
Setting Unit Default Setting
1 ms
Setting Unit Default Setting
1 ms
6.3 SEMI F47 Function
When Enabled
50 Immediately
When Enabled
100 Immediately
When Enabled
20 Immediately
The main circuit bus voltage
increases when the main
circuit power supply recovers.
Setting of Pn425
Classification
Setup
Classification
Setup
Classification
Setup
6
6-7