SHENZHEN INVT ELECTRIC CO., LTD. CHV160 Operation Manual
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1: general motor (with low speed compensation). As general motor has a poor heat
emission at low speed, the relevant electronic thermal protection should be regulated properly.
The low speed compensation characteristic here mentioned is to switch down the overloading
protection threshold for the motor with an operation frequency lower than 30 Hz.
2: Variable frequency motor (without low speed compensation). As the heat emission of
special variable frequency motor is not affected by speed, it is not required to regulate the
protection value for low speed operation.
Function
Code
Name
Description
Setting range
Default
Value
Pb.03
Motor Overloading Protection Current
20.0%
120.0%
20.0
120.0
100.0%
The value can be determined by following equation:
Motor overload protection current = (the allowed maximum overload current / inverter
rated current)*100%
It is mainly applied to the cases that big inverter drives small motor, requiring to correctly
set up this function to protect the motor.
Function
Code
Name
Description
Setting
range
Default
Value
Pb.04
Overload
pre-warning point
20.0%
150.0%
20.0
150.0
130.0%
Pb.05
Overload
pre-warning option
0: relative to motor rated current,
detected all the time
1: relative to motor rated current,
detected when speed is constant
2: relative to inverter rated current,
detected all the time
3: relative to inverter rated current,
detected when speed is constant
0
3
0
Pb.06
Overload
pre-warning delay
time
0.0
30.0s
0.0
30.0
5.0s
Overload pre-warning option: determines the warning category, such as inverter
overload (OL1) and motor overload (OL2).
Overload pre-warning point: it is the current threshold when overload pre-warning is
triggered, and it is set as the percentage relative to the rated current.
Overload pre-warning delay time: inverter output current is more than overload
pre-warning point, and if the duration exceeds the overload pre-warning delay time, output a
pre-warning signal. It is illuminated as following figure:
