Parameter 05.028 Flux Control Compensation Disable
Short description Set to 1 to disable Flux Control Compensation
Mode Open‑loop
Minimum 0 Maximum 1
Default 0 Units
Type 1 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
If FluxControlCompensationDisable (05.028) = 0 the conversion from the FinalTorqueReference (04.003) to FinalCurrentReference (04.004) takes into
account the reduction in flux above base speed by increasing the current demand in order to keep the torque in the motor as requested. This is the preferred
method of control as it ensures that the gain of the system remains constant in frequency control mode and it gives the correct relationship between torque
and current in torque control modes. However, it is possible to get instability in frequency control mode when flux is weak at high speed, which may be caused
by the MotorRatedSpeed (05.008) being set to an incorrect value. If FluxControlCompensationDisable (05.028) =1the compensation for flux level is
disabled which can sometimes prevent instability under these conditions.
Parameter 05.031 Voltage Controller Gain
Short description Defines the proportional gain of the d.c. link voltage controller
Mode Open‑loop
Minimum 1 Maximum 30
Default 1 Units
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
VoltageControllerGain (05.031) can be used to modify the proportional gain of the d.c. link voltage controller used for standard ramp and supply loss control.
Parameter 05.032 Torque Per Amp
Short description Displays the calculated value of kt for the attached motor
Mode Open‑loop
Minimum 0.00 Maximum 500.00
Default Units Nm/A
Type 16 Bit Volatile Update Rate Background write
Display Format Standard Decimal Places 2
Coding RO, ND, NC, PT, BU
TorquePerAmp (05.032) is automatically calculated from the motor parameters assuming a motor efficiency of 90%.
TorquePerAmp (05.032) = Estimated rated shaft power / [((MotorRatedSpeed x 2π) / 60) x I
TRated
]
where
I
Trated
is the rated torque producing current (see TorqueProducingCurrent (04.002) ) and
Estimated rated shaft power = √3 x MotorRatedVoltage (05.009) x MotorRatedCurrent (05.007) x MotorRatedPowerFactor (05.010) x 0.9
TorquePerAmp (05.032) is used in the automatic calculation of the speed controller gains.
Parameter 05.033 Slip Compensation Limit
Short description Defines the limit for slip compensation
Mode Open‑loop
Minimum 0.00 Maximum 10.00
Default 10.00 Units Hz
Type 16 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 2
Coding RW
Symmetrical maximum of the slip compensation frequency. This parameter applies a limit to the amount of slip compensation used.
Parameter 05.035 Auto-switching Frequency Change Disable
Short description Set to 1 to prevent the drive from changing between switching frequencies
Mode Open‑loop
Minimum 0 Maximum 1
Default 0 Units
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
See MaximumSwitchingFrequency (05.018).
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