Menu 3
Closed-loop
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x.00
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Performance RFC mode
66 Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 10
The motor will move to one of a number of positions defined by the number of motor pole pairs (i.e. 3 positions for a six pole motor, etc). The encoder
should be adjusted so that the U commutation signal is high, W is low and V is toggling in one of these positions.
Any other feedback device
The alignment required between the no-load motor voltages and the commutation signals for Pr 3.25 = 0 is shown in the diagram below for a 2 or 4
pole motor. For higher numbers of poles 0
° should still be aligned as shown, but one electrical cycle shown corresponds to 360°/ (Number of poles /
2). The encoder can be aligned statically by connecting the motor to a DC power supply as already shown. The motor will move to one of a number of
positions defined by the number of motor pole pairs (i.e. 3 positions for a six pole motor, etc). The encoder should be adjusted so that the position
displayed by the drive is n x 65536 / (Number of poles / 2), where n = 0, 1, ... (Number of poles / 2)
It should be noted that if the encoder is advanced (i.e. the encoder is moved so that the angle moves to the right with respect to the voltages) the
phasing angle in Pr 3.25 is increased from zero. If the encoder is retarded the phasing angle changes to 359.9° and then reduces towards zero.
0, drv: Drive encoder
The position feedback from the encoder connected to the drive itself is used to derive the speed feedback for the speed controller and to calculate
the motor rotor flux position.
1, Slot1: Solutions Module in slot 1
The position feedback from the Solutions Module in Solutions Module slot 1 is used to derive the speed feedback for the speed controller and to
calculate the motor rotor flux position. If a position feedback category Solutions Module is not installed in slot 1 the drive produces an EnC9 trip.
2, Slot2: Solutions Module in slot 2
3, Slot3: Solutions Module in slot 3
3.26
Speed feedback selector
Drive modes Closed-loop vector, Servo
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range Closed-loop vector, Servo 0 to 3
Default Closed-loop vector, Servo 0
Second motor
parameter
Closed-loop vector, Servo Pr 21.21
Update rate Background read (Only has any effect when the drive is disabled)
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