YASKAWA FSDrive-MV1000 Parameter Manual page 209

Overvoltage Suppression Function
n
This function suppresses overvoltage faults by decreasing the regenerative torque limit and slightly increasing the output
frequency when the DC bus voltage rises. It can be used to drive loads with cyclic regenerative operation, such as a
punch press or other applications that involve repetitive crank movements.
Note: 1. The motor speed will exceed the frequency reference when overvoltage suppression is triggered. Consequently, overvoltage
suppression is not appropriate in applications that require a perfect match between the frequency reference and the motor speed.
2. Overvoltage may still occur if there is a sudden increase to a regenerative load.
3. This function is enabled only when operating just below the maximum frequency. Overvoltage suppression does not increase the
output frequency beyond the maximum frequency. If this is required by the application, increase the maximum frequency and change
the base frequency setting.
L3-11: Overvoltage Suppression Selection (CLV Control Mode Only)
n
Enables or disables the overvoltage suppression function.
No.
L3-11 Overvoltage Suppression Function Selection
Setting 0: Disabled
The regenerative torque limit and the output frequency are not adjusted. A regenerative load may trip the drive with an
overvoltage fault.
Setting 1: Enabled
When the DC bus voltage rises due to regenerative load, an overvoltage fault is prevented by decreasing the regenerative
torque limit and increasing the output frequency.
L3-27: Stall Prevention Detection Time
n
Sets a delay time from when the Stall Prevention level is reached and the actual Stall Prevention function is activated.
No.
L3-27
YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide
Name
Name
Stall Prevention Detection Time
Setting Range
0, 1
Setting Range
0 to 5000 ms
2.8 L: Protection Functions
Default
0
Default
50 ms
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