120 Description Of Specific Functions
V560 Series High Performance Closed-Loop Vector Inverter User Manual
Time
Frequency
[F1.2.15]
[F0.4.39]
[F0.4.40]
F0.4.41 Start pre-excitation current Setting range: 0.0~100% Factory default: 35.0
F0.4.42 Start pre-excitation time
Setting range:
0.00~10.00Sec.
Factory default: 0.10
It costs some time to develop air gap flux for asynchronous motor (approaching to the constant of the rotor
time). When it is at stop status before the motor is started, in order to get enough start torque, it is a must to
develop the air gap flux. Therefore, it is needed to start pre-excitation for the asynchronous motor. See
Figure 7-18 for the pre-excitation process.
The set value of start pre-excitation current is the percentage with respect to the inverter rated output current.
The start pre-excitation time means the duration in which the inverter inputs start pre-excitation current for
the motor.
Current
Output
frequency
[F0.4.41]
[F0.4.42]
Figure 7-17 Start frequency sketch
Figure 7-18 Start pre-excitation output
¾ When the rated current of the adapter motor differs greatly from the rated current of the
inverter, please carefully set the pre-excitation current (F0.4.41), as excessive setting may
damage the motor.
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