Beijer Electronics Frequency Inverter BFI-E3
KI00369C 2021-09
www.beijer.se www.beijer.no
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5.11 Vector control with standard induction motor
Vector control is a built-in function that gives additional torque at low speed and also makes
motor speed constant even though load of the motor fluctuates.
Vector control is based on a mathematical description of motor characteristic. BFI-E3 can by this
calculated actual speed of the motor. Vector control is activated by default and based on a motor
with the same kW as the BFI. With another motor type or if the performance is to be optimized
an auto tuning can be done. This is done by setting of parameters below:
•
Open up parameters P-14=201
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Rated motor voltage in P-07 [V].
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Rated motor current in P-08 [A].
•
Rated motor frequency in P-09 [Hz].
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Industrial application in P-13=0.
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Standard Induction motor with P-51=0.
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Start auto tuning by setting P-52=1, it starts immediately when parameter is changed.
Autotuning can ONLY be started by setting P52=1 on the Keypad!
When auto tuning is done measured values are stored in parameter P-55, P-56 and P-57. Auto
tuning only needs to be done once.
If motor creates strange sound, weak torque performance and speed is not stable, change Gain of
the speed controller, P-53. Increased value gives faster response but increase risk for instability.
5.12 Current limit control
Parameter P-54 (default setting is 150%) contain the maximum amount of current to be sent to
motor. If current limit is reached BFI will try to decrease motor current by adjusting output
frequency. During constant speed output frequency will automatically decrease and during
acceleration the acceleration time will automatically increase.
A too large setting of P-54 might cause trip of BFI because it does not get enough time to make
the output frequency adjustment.
5.13 Tuning of PM-motor
Always make an auto tuning of a PM-motor, see Vector control, 5.10. Also set following
parameters:
•
Open up parameters P-14=201
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Rated motor frequency in P-09 [Hz]=Rated speed [rpm] x Number of poles/120
•
PM-motor Speed control, P-51=2
•
Start auto tuning by setting P-52=1, it starts immediately when parameter is changed.
Check after auto tuning that measured resistance and inductance values correspond towards
datasheet of the motor. To improve torque performance at low speed, increase P-11 carefully.
