Detailed Function Description
99
Function
Code
Name Description Setting Range
Factory
Setting
Pb.07
Threshold of
trip-free
230.0V~600.0V 230.0~600.0 450.0V
PB.08
Decrease rate
of trip-free
0.00Hz~P0.07 0.00Hz~P0.07 0.00Hz
If PB.08 is set to be 0, the trip-free function is invalid.
Trip-free function enables the inverter to perform low-voltage compensation when DC
bus voltage drops below PB.07. The inverter can continue to run without tripping by
reducing its output frequency and feedback energy via motor.
Notice: If PB.08 is too big, the feedback energy of motor will be too large and may
cause over-voltage fault. If PB.08 is too small, the feedback energy of motor will be
too small to achieve voltage compensation effect. So please set PB.08 according
to load inertia and the actual load.
Function
Code
Name Description
Setting
Range
Factory
Setting
PB.09
Over-voltage stall
protection
0: Disabled
1: Enabled
0~1 0
PB.10
Over-voltage stall
protection point
120~150% 120~150 125%
During deceleration, the motor’s decelerating rate may be lower than that of inverter’s
output frequency due to the load inertia. At this time, the motor will feed the energy back
to the inverter, resulting in DC bus voltage rise. If no measures taken, the inverter will trip
due to over voltage.
During deceleration, the inverter detects DC bus voltage and compares it with
over-voltage stall protection point. If DC bus voltage exceeds PB.10, the inverter will stop
reducing its output frequency. When DC bus voltage become lower than PB.10, the
deceleration continues, as shown in following figure.
Figure 6.37 Over-voltage stall function.
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