Introduction
Parameter
x.00
Parameter
description format
Keypad and
display
Serial
communications
CT Modbus
RTU
PLC Ladder
programming
CTSoft Menu 0
Advanced parameter
descriptions
Menu 21
Commander SK Advanced User Guide 193
Issue Number: 9 www.controltechniques.com
raises the start point of the square law characteristic as shown below.
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 21.07) 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.
Pr 21.10 should be set to the motor power factor before an autotune is carried out.
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 21.06) and the rated load rpm (Pr 21.08).
The number of poles = 120 x rated frequency / rpm rounded to the nearest even number.
21.10 Motor 2 motor rated power factor
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
2 1 111
Range 0.00 to 1.00
Default 0.85
First motor
parameter
Pr 5.10
Update rate Background
21.11 Motor 2 number of motor poles
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1 111
Range Auto(0), 2P(1), 4P(2), 6P(3), 8P(4)
Default Auto(0)
First motor
parameter
Pr 5.11
Update rate Background
Poles by text
(value on display)
Pole pairs
(value through serial comms)
Auto 0
2P 1
4P 2
6P 3
8P 4
Pr
21.09
Pr
5.15
Pr
21.06
Pr + [(freq/Pr ) x (Pr - Pr )]
5.15 21.06 21.09 5.15
2
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