4-188
Figure 4.3.91 OVP Operatrion
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.
Monitor the DC voltage filter output by 12-20 (DC voltage filter value).
Set the DC voltage filter decrease rate (11-34) to a greater value than the value of the DC
voltage filtering increase rate (11-33).
(2) When the inverter is operation at a fixed output frequency, the OVP function will monitor the
DC-bus voltage to detect regenerative operation
In case of a regenerative condition the inverter calculates the delta DC bus voltage value
and multiplies the value with parameter 11-36, the result is added to the frequency
reference accelerating the motor to prevent on an overvoltage condition.
When the regenerative energy decreases, the inverter output frequency will return to the
actual frequency reference. Deceleration rate is based on the DC voltage, as shown in
figure 4.3.92.
Figure 4.3.92 OVP deceleration time
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