ACD320 user manual
Parameter Description
F5.05
Over-voltage Stall
Protection Voltage
110～150%(380V)
110～150%(220V)
120%
115%
During the inverter deceleration, the load inertia may cause the actualmotor speed drop rate
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 ismade.
Over-voltage stall protection function is to detect the bus voltage and compare itwith the
stall over-voltage point defined by F5.05 (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:
Fig.6-22Over-voltage Stall Function
Function Code
Name
Setting Range
Default
Value
F5.06
Auto limit current level 100～200%
160%
F5.07
Limit current frequency
drop rate
0.00～200.00Hz/s
50.00Hz/s
When inverter is running, the actual climbing rate of motor speed is lower than climbing
rate of output frequency because load is too big. If you don抰 take any action, it will cause over
current fault in acceleration then inverter will trip.
Over-current stall protection function is to detect output current and compare it with the
current limit defined by F5.06. If it exceeds the current limit, output frequency drop down
according to F5.07.When it show that output current is lower than limit current, inverterwill
remain normal operation.
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