INVT CHV160A Series - Page 158

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Setting
Range
Factory
Setting
PA.09
OVER VOLT STALL
OV PROTECT
0: Protection forbidden
1: Protection permitted
0 ～ 1 0
PA.10
POINT
120 ～ 150% 120 ～ 150 125
During the process of deceleration, the load inertia may cause the actual that drop rate of
motor speed is lower than the output frequency drop rate, and thereby the motor
generates electricity and feeds it back to the inverter, causing the inverter bus voltage
going up and even bus over-voltage breakdown which then can cause inverter tripping if
no provision is made.
Over-voltage stall protection function is to detect the bus voltage and compare it with the
stall over-voltage point defined by Pb.10 (relative to the standard bus voltage). If it
exceeds the over-voltage stall point, inverter output frequency stop going down, and
when the next bus voltage detected is lower than the over-voltage stall point, the inverter
continues to decelerate, as shown by following figure.