4-187
11- 38 Deceleration start voltage of OV prevention
Range
230V：【200~400】V
400V：【400~800】V
11- 39 Deceleration end voltage of OV Prevention
Range
230V：【300~400】V
400V：【600~800】V
11- 40 OV Prevention Selection
Range
【0】：Disable
【1】：OV prevention Mode 1
【2】：OV prevention Mode 2
【3】：OV prevention Mode 3
Over-voltage suppression is used for the application of likely causing to energy recharge.
Example：
There are two situations causing excessive energy to recharge the inverter in stamping application.
(1) When cam clutch is not engaged, the motor will accelerate and start flywheel. When motor
decelerates, the rotation speed will higher than motor speed owing to the large flywheel’s
inertia and then recharge the inverter.
(2) When cam clutch is engaged, the motor will start flywheel and compress the spring. When the
highest point of the cam moves beyond its center, the spring will release the power to the
flywheel and excessive energy output recharge the inverter.
Figure 4.3.90 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 4.3.91.
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