SHENZHEN INVT ELECTRIC CO., LTD. CHV160 Operation Manual
81
Figure 6-23 Overload Pre-warning actuation Schematic Diagram
Function
Code
Name
Description
setting range
Default
Value
Pb.07
Instant Power-down
Frequency Drop Point
400.0V~600.0V
400.0~600.0
450.0V
Pb.08
Instant Power-down
Frequency drop rate
0.00Hz~P0.07
0.00Hz~P0.07
0.00Hz
If the instant power-down drop rate is set to be 0, the instant power-down restart function
is invalid.
Instant power-down frequency drop point: it is indicting when the bus voltage, after the
power network is down and drops to the instant power-down frequency drop point, the inverter
starts to decrease the operation frequency based on the instant power-down frequency drop
rate, enabling the motor to generate electricity which is fed back to keep the bus voltage, and
thus ensuring the inverter is operating normally till inverter power is on again.
Important: Adjusting these two parameters properly can magnificently achieve the
power network switching instead of causing inverter protection and thus causing
production shutdown.
Function
Code
Name
Description
setting
range
Default
Value
Pb.09
Over-voltage Stall
Protection
0: prohibit protection
1: allow protection
0
1
0
Pb.10
Over-voltage Stall
Protection Voltage
120
150%
120
150
130%
During the inverter deceleration, the load inertia may cause the actual motor 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 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
