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(1) When the running current of the motor reaches 175% times of the rated current of the motor, the motor
overload (Err10) will be reported after continuous running for 2 minutes; When the running current of the motor
reaches 115% of the rated current of the motor, the motor overload (Err10) will be reported after continuous
operation for 80 minutes.
The maximum overload time is 80 minutes and the minimum overload time is 10 seconds.
(2) For example, motor overload protection adjustment: it is required that the motor should operate for 2
minutes under 150% motor current to report overload. According to the motor overload curve diagram, 150% (I)
current is in the current range of 145% (I1) and 155% (I2), 145% of current is overloaded for 6 minutes (T1),
155% of current is overloaded for 4 minutes (T2), so the 150% overload of the rated current for 5 minutes under
the default setting is calculated as follows:
T=T1＋(T2－T1)*(I－I1)/(I2－I1)=4＋(6－4)*(150%－145%)/(155%－145%)=5 minutes
It can be concluded that the motor needs to report overload in 2 minutes under the condition of 150% motor
current. Motor overload protection gain: P7-34=2÷5=0.4
Note: the user needs to set the value of P7-34 correctly according to the actual overload capacity of the motor. If
the parameter is set too large, it is easy to cause the motor overheating damage and the frequency converter does
not alarm and protect in time!
Motor temperature sensor type
0: No temperature sensor
1: PT100
Motor overheat protection threshold
Motor overheat warning threshold
The temperature signal of the motor temperature sensor needs to be connected to the AI3 terminal of card slot A.
The AI3 analog input terminal of VH6 supports PT100 temperature sensor. The motor temperature value is
displayed in U0-40.
When the motor temperature exceeds the motor overheat protection threshold P7-37, the inverter will give an
alarm and deal with it according to the selected fault protection action mode.
When the motor temperature exceeds the motor overheat warning threshold P7-78, the inverter multi-function
digital Y outputs the motor overheat warning ON signal.
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