38
Commander SK Getting Started Guide
www.controltechniques.com
Issue Number: 9
Enter the motor rated frequency (taken from the motor name plate).
Defines the voltage to frequency ratio applied to the motor.
Auto
: Automatically calculates the number of motor poles from the settings of Pr
07
and Pr
39
2P
:
Set for a 2 pole motor
4P
:
Set for a 4 pole motor
6P
:
Set for a 6 pole motor
8P
:
Set for an 8 pole motor
Ur S
:
Stator resistance is measured each time the drive is enabled and run
Ur
:
No measurement is taken
Fd
:
Fixed boost
Ur A
:
Stator resistance is measured the first time the drive is enabled and run
Ur I
:
Stator resistance measured at each power-up when the drive is enabled and run
SrE
:
Square law characteristic
In all Ur modes, the drive operates in open loop vector mode.
Determines the boost level when Pr
41
is set to Fd or SrE.
When a rotating autotune is selected, the drive will accelerate the motor up to
2
/
3
maximum speed in Pr
02
. Once a rotating autotune has been initiated (Pr
38
set to 2)
on Commander SK, it must be completed before the drive will operate normally. If the
rotating auto-tune is not completed (through the drive being disabled or a trip
occuring), the drive will only run at the autotune speed (2/3 rated speed reference)
when the drive is asked to run again.
WARNING
The motor must be at a standstill before a non-rotating autotune is initiated.
NOTE
The motor must be at a standstill and unloaded before a rotating autotune is initiated.
NOTE
No
Function
Range
Defaults
Type
39
Motor rated frequency
0.0 to 1500.0 Hz
Eur: 50.0, USA: 60.0
RW
No
Function
Range
Defaults
Type
40
Number of motor poles
Auto, 2P, 4P, 6P, 8P
Auto
RW
No
Function
Range
Defaults
Type
41
Voltage mode select
Ur S, Ur, Fd, Ur A, Ur l, SrE
Eur: Ur I, USA: Fd
RW
The drive default setting is Ur I mode which means that the drive will carry out an
autotune every time the drive is powered-up and enabled. If the load is not going to be
stationary when the drive is powered-up and enabled, then one of the other modes
should be selected. Not selecting another mode could result in poor motor performance
or OI.AC, It.AC or OV trips.
NOTE
No
Function
Range
Defaults
Type
42
Low frequency voltage boost
0.0 to 50.0 %
Eur: 3.0, USA: 1.0
RW
Summary of Contents for Commander SK
Page 53: ......