CHINT NVF5-0.75/TS4-B - Page 77

NVF5 Series User Manual Chapter 6 Parameter Function Description
6.9.2 Motor Overload Protection
Code Name Default Setting Range Description
FE.00
Motor Overload
Protection Selection
1
0 ～ 1
0：Ineffective
1：Effective
FE.01
Motor Overvoload
Protection Gain
1.00
0.20 ～ 10.00
-
FE.02
Motor Overload Early
Alarm Enable
0
0 ～ 1
0：Ineffective
1：Effective
FE.03
Motor Overload Early
Alarm Level
80%
（20 ～ 200）%
-
● Motor Overload Protection Gain
In order to effectively protect the motor under different loads, the overload protection
gain FE.01 should be set according to the current output overload capacity. The overload
protection of the motor is an inverse time curve.
Motor overload
protection Gain
Time
Current
10 minutes
150%
120%
100%80%
Figure 6-9-1 Motor Overlaod Inverse Time Curve
When the overload protection gain FE.01 is set to 100%, the inverse time limit
characteristic of motor overload protection is defaulted to: motor overload fault will occur
after running continuously for 10 minutes under the condition of 150% motor rated current;
motor overload fault will occur after running continuously for 80 minutes under the
condition of 110% motor rated current.
● Motor Overload Early Alarm
Motor overload early alarm function is used to output warning signal to control system
through DO before motor overload fault protection. The early alarm coefficient is used to
determine the level of early alarm before motor overload protection, and the larger the
value, the smaller the early alarm amount.
When the cumulative output current of the inverter is greater than the overload time
(the cumulative value of the inverse time curve of motor overload protection) × the
overload alarm level FE.03 of the motor, the DO will output the effective signal of motor
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