4-211
Figure 4.4.80.a Stamping Operation
Over-voltage prevention (OVP) function monitors the DC-bus voltage and adjusts the speed reference,
acceleration and deceleration rate, to prevent the inverter from tripping on an overvoltage.
When the speed reference is reduced, the motor will start to decelerate. When the inverter is operating at a
fixed output frequency and excessive regenerative energy back to the inverter is detected the inverter will
accelerate the motor in order to reduce the DC-bus voltage. Refer to figure 4.4.80.b.
Figure 4.4.80.b operation
When 11-40=1: OV prevention Mode 1
1) DC voltage filter is used to provide a stable reference value for determining the change in DC voltage
change during regenerative operation.
- Adjust the DC voltage filtering increase rate parameter 11-33 (DC Voltage Filter Rise Amount). When
the DC voltage exceeds 11-33 +11-35 (DC Voltage Filter Deadband Level), the output of the filter will
increase.
- Adjust the DC voltage filtering decrease rate parameter 11-34 (DC Voltage Filter Fall Amount). When the
DC voltage exceeds 11-33 +11-35 (DC Voltage Filter Deadband Level), the output of the filter will
decrease.
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