Control Techniques Commander SE Advanced User's Manual page 192

Active
current
4.02
Power
factor
09
From the motor rated current entered in parameter 06 and the power factor entered in parameter 09, the drive will calculate
the expected magnetising and active current from the following equation:
Parameter 06 x Parameter 09 = 100% x Motor rated active current
Magneti sin
Current Limit
The current limit value will depend on the motor rated current value entered in parameter 06. If the value is as per default, the
maximum current limit will be 165% rated active current. This is calculated from the following equation:
MaximumCurrentLimit
If the motor rated current is reduced, then the maximum current limit will increase up to a maximum value of 1000%.
Increasing the current limit does not mean that you can get more current out of the drive. The maximum current that the drive
will deliver is 150% of drive rated current.
Slip Compensation
If accurate slip compensation is required, it is important that the correct power factor is set so that the drive calculates the
correct active current. The amount of slip compensation to be applied to the motor is calculated from the following equation:
SlipCompensation
If the power factor is set incorrectly, the active current values will be incorrect and therefore the amount of slip compensation
applied to the motor will be incorrect.
Analog Voltage Output
If an accurate analog output voltage on terminal 6 is required, again the power factor should be set correctly so that the drive
calculates the correct motor active current.
Vout -------------------------------------------------------------------------- -
=
1.5
% Full Load Current - Parameter 4.20
For an accurate indication of load in parameter 4.20 and also for the motor overload and current limit to be correct, again the
correct power factor must be entered.
PercentageMotorLoad
192
Current
magnitude
4.01
Magnetising
current
4.17
gCurrent Parameter06
=
DriveRatedCurrent 1.25
= ------------------------------------------------------------------------------------------------------------------------------ -
MotorRatedCurrent
MotorRatedSlip
-----------------------------------------------------------------------------------------------------
=
MotorRatedActiveCurrent
ActiveCurrent
×
10
×
DriveRatedCurrent
MotorActiveCurrent
------------------------------------------------------------------------ -
=
MotorRatedCurrent
2 2
ActiveCurrent
–
+ PowerFactor
×
PowerFactor
×
ActiveCurrent
×
100
×
PowerFactor
2
%
Commander SE Advanced User Guide
Issue Number: 4