Rated Power Factor; Number Of Motor Poles; Autotune - Control Techniques unidrive sp Advanced User's Manual

Parameter Keypad and Parameter
structure display x.00
5.10

Rated power factor

Drive modes Open-loop, Closed-loop vector
Bit SP
Coding
Range Open-loop, Closed-loop
Default Open-loop, Closed-loop vector
Second motor
Open-loop, Closed-loop vector
parameter
Update rate Background read
Open loop
The power factor is the true power factor of the motor, i.e. the angle between the motor voltage and current. The power factor is used in conjunction
with the motor rated current (Pr 5.07) to calculate the rated active current and magnetising current of the motor. The rated active current is used
extensively to control the drive, and the magnetising current is used in vector mode Rs compensation. It is important that this parameter is set up
correctly.
Closed loop vector
The power factor is the true power factor of the motor, i.e. the angle between the motor voltage and current. If the stator inductance is set to zero (Pr
5.25) then the power factor is used in conjunction with the motor rated current and other motor parameters to calculate the rated active and
magnetising currents which are used in the vector control algorithm. If the stator inductance has a non-zero value this parameter is not used by the
drive, but is continuously written with a calculated value of power factor
5.11

Number of motor poles

Drive modes Open-loop, Closed-loop vector, Servo
Bit SP
Coding
Range Open-loop, Closed-loop vector, Servo
Open-loop, Closed-loop vector
Default
Servo
Second motor
Open-loop, Closed-loop vector, Servo
parameter
Update rate Background read
Open-loop
This parameter is used in the calculation of motor speed and in applying the correct slip compensation. When auto is selected the number of motor
poles is automatically calculated from the rated frequency (Pr 5.06) and the rated load rpm (Pr 5.08). The number of poles = 120 * rated frequency /
rpm rounded to the nearest even number.
Closed-loop vector
This parameter must be set correctly for the vector control algorithms to operate correctly. When auto is selected the number of motor poles is
automatically calculated from the rated frequency (Pr 5.06) and the rated load rpm (Pr 5.08). The number of poles = 120 * rated frequency / rpm
rounded to the nearest even number.
Servo
This parameter must be set correctly for the vector control algorithms to operate correctly. When auto is selected the number of poles is set to 6.
5.12

Autotune

Drive modes Open-loop, Closed-loop vector, Servo
Bit SP
Coding
Open-loop,
Range Closed-loop vector,
Servo
Default Open-loop, Closed-loop vector, Servo
Update rate Background read
If this parameter is set to a non-zero value, the drive is enabled and a run command is applied in either direction the drive performs an auto-tune test
for the drive modes listed below. All tests that rotate the motor are carried out in the forward direction if Pr 1.12 = 0 or the reverse direction if Pr 1.12
= 1. For example, if the test is initiated by applying run reverse (Pr 6.32 = 1) the test is performed in the reverse direction. It should be noted however
that the motor may jump in either direction by up to half an electrical revolution at the start of the phasing test and then move in the required direction
for the remainder of the test. The test will not start unless the drive is disabled before the test is initiated by applying the enable or run, i.e. it will not
start if the drive is in the stop state. In closed-loop modes it is not possible to go into the stop state if Pr 5.12 has a non-zero value. (If Pr 5.12 is set to
4 in closed-loop vector mode or 6 in servo mode then no test is carried out, but the current loop gains are re-calculated. For these actions the drive
Unidrive SP Advanced User Guide
Issue Number: 7
Parameter Advanced parameter
description format descriptions
FI DE Txt VM DP ND RA
3
0.000 to 1.000
0.850
Pr 21.10
FI DE Txt VM DP ND
1
0 to 60 (Auto to 120 POLE)
0 (Auto)
3 (6 POLE)
Pr 21.11
FI DE Txt VM DP ND RA
0 to 2
0 to 4
0 to 6
0
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Serial comms
Macros
protocol
NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
NC NV PT US RW BU
1
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Performance
nameplate up table
PS
1
PS
1
PS
1
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