Parameter
structure
Keypad and
display
Parameter
x.00
Parameter
description format
Advanced parameter
descriptions
Macros
Serial comms
protocol
Electronic
nameplate
Performance RFC mode
Menu 5
Unidrive SP Advanced User Guide
117
Issue Number: 10 www.controltechniques.com
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
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.
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.
5.10
Rated power factor
Drive modes
Open-loop, Closed-loop vector
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
3
1
1
1
1
Range
Open-loop, Closed-loop
0.000 to 1.000
Default
Open-loop, Closed-loop vector
0.850
Second motor
parameter
Open-loop, Closed-loop vector
Pr
21.10
Update rate
Background read
5.11
Number of motor poles
Drive modes
Open-loop, Closed-loop vector, Servo
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU PS
1
1
1
1
Range
Open-loop, Closed-loop vector, Servo
0 to 60 (Auto to 120 POLE)
Default
Open-loop, Closed-loop vector
Servo
0 (Auto)
3 (6 POLE)
Second motor
parameter
Open-loop, Closed-loop vector, Servo
Pr
21.11
Update rate
Background read
5.12
Autotune
Drive modes
Open-loop, Closed-loop vector, Servo
Coding
Bit
SP
FI
DE Txt VM DP ND RA NC NV
PT
US RW BU
PS
1
1
1
Range
Open-loop,
Closed-loop vector,
Servo
0 to 2
0 to 4
0 to 6
Default
Open-loop, Closed-loop vector, Servo
0
Update rate
Background read
Summary of Contents for unidrive sp
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