EM15 User’s Manual
5. Description of Function Codes
71
This parameter is used to display the delivered model and cannot be modified.
0: Applicable to variable torque load (fan and pump) with rated parameters specified.
1: Applicable to constant torque general load with rated parameters specified.
bb-01
Motor overload protection selection
Default
1
Setting
Range
0
Disabled
1
Enabled
bb-02
Motor overload protection gain
Default
1.00
Setting Range
0.20~10.00
⚫
bb-01 =0
The motor overload protective function is disabled. The motor is exposed to potential damage due to overheating. A
thermal relay is suggested to be installed between the frequency inverter and the motor.
⚫
bb-01 = 1
The frequency inverter judges whether the motor is overloaded according to the inverse time-lag curve of the motor
over load protection.
The inverse time-lag curve of the motor overload protection is:
220% × (bb-02) × rated motor current
(if the load remains at this value for one minute, the frequency inverter reports motor overload fault), or
150% × (bb-02) ×rated motor current
(if the load remains at this value for 60 minutes, the frequency inverter reports motor overload fault).
Set bb-02 properly based on the actual overload capacity. If the value of bb-02 is set too large, may result in damaging
to the motor because the motor overheats but the frequency inverter does not report the alarm.
bb-03
Motor overload pre-warning coefficient
Default
80%
Setting Range
50%~100%
This function is used to give a warning signal to the control system via DO before motor overload protection. This
parameter is used to determine the percentage, at which pre- warning is performed before motor overload. The larger
the value is, the less advance the pre-warning will be.
When the output current of the frequency inverter is greater than the value of the overload inverse time-lag curve
multiplied by bb-03, the DO terminal of the frequency inverter set with motor overload pre-warning becomes ON.
bb-09
Fault auto reset times
Default
0
Setting Range
0~20(Unlimited number of times)
It is used to set the times of fault auto resets if this function is used. After the value is exceeded, the frequency
inverter will remain in the fault state.
bb-10
Relay action selection during fault auto reset
Default
0
Setting
Range
0
Not act
1
Act
It is used to decide whether DO acts during the fault auto reset if the fault auto reset function is used.
bb-11
Time interval of fault auto reset
Default
1.0s
Setting Range
0.1s~100.0s
