Menu 5 Introduction Parameter x.00
Parameter
description format
Keypad and
display
CT Modbus
RTU
User
programming
CT Soft Menu 0
Advanced parameter
descriptions
60 Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 2
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.
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 x rated frequency / rpm rounded to the nearest even number.
0: No auto-tune
1: Non-rotating static auto-tune
2: Rotating auto-tune
If this parameter is set to a non-zero value and the drive is enabled and a run command is applied in either direction, the drive will perform an auto-
tune test.
The drive must be in disabled or stopped condition before the test is initiated by applying a run command. The autotune test will not begin while the
drive is in a disabled or stopped condition.
It is important that the drive is at standstill before the auto-tune test is performed if the correct results are to be obtained.
The parameters modified by the autotune tests are defined below. If the second motor map is selected for the duration of the tests (i.e. Pr 11.45 = 1),
the second motor parameters in menu 21 are modified and not the parameters described below. All modified parameters are saved to EEPROM
immediately after the auto-tune is complete. When the test is completed successfully the drive is disabled. The motor can only be restarted if the
enable or run command is removed and then re-applied or if the drive is tripped, reset and then given a run command.
5.10 Motor rated power factor
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
2111
Range 0.00 to 1.00
Default 0.85
Second motor
parameter
Pr 21.10
Update rate Background
5.11 Number of motor poles
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range 0 (Auto), 1 (2P), 2 (4P), 3 (6P), 4 (8P)
Default 0 (Auto)
Second motor
parameter
Pr 21.11
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
5.12 Autotune
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range 0 to 2
Default 0
Update rate Background
NOTE
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