Menu 5
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Parameter x.00
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Performance
86 Digitax ST Advanced User Guide
www.controltechniques.com Issue Number: 1
This parameter controls the gain of the voltage controller used for mains loss and standard ramp control. If the parameter is set to 1 the gain used is
suitable for applications where the drive is used alone. Higher values are intended for applications where the DC bus of each drive is connected in
parallel and the drive is used as a master for mains loss control (If motors are locked together using digital-locking, using a master for mains loss
control, it is unlikely that the system will be stable during mains loss unless the power rating of the master is much higher than the combined rating of
the slaves. This is due to the lag created by the master motor inertia).
This parameter shows the motor torque per amp of active (torque producing) current used to calculate the speed controller gains when the automatic
set-up methods are active (i.e. Pr 3.17 = 1 or 2).
The motor torque per amp (Kt) must be entered in this parameter by the user for the automatic gain calculation system to operate correctly, and to
allow the drive to calculate the correct inertia during and inertia autotune.
This parameter is used to set up the current controller integral terms when the drive is disabled to prevent current transients when the drive is enabled
with a spinning motor. It is also used to provide a voltage feed forward term if high dynamic performance is selected with Pr 5.26.
The drive thermal protection scheme (see Pr 7.34 on page 106) reduces the switching frequency automatically when necessary to prevent the drive
from overheating. It is possible to disable this feature by setting this bit parameter to one. If the feature is disabled the drive trips immediately when
the IGBT temperature is too high.
This parameter should be set up to give the pole pitch of a linear motor, i.e. the movement of the motor for one cycle of the drive power output
waveforms, if auto-configuration with a linear EnDat encoder is required.
5.31 Voltage controller gain
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range 0 to 30
Default 1
Update rate Background read
5.32 Motor torque per amp (Kt)
Coding
Bit SP FI DE TE VM DP ND RA NC NV PT US RW BU PS
2 111
Range
0.00 to 500.00 NmA
-1
Default 1.60
Update rate Background (1s) read
5.33 Motor volts per 1000rpm (Ke)
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Range 0 to 10,000
Default 98
Second motor
parameter
Pr 21.30
Update rate
Background read
5.35 Disable auto-switching frequency change
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default 0
Update rate
Background read
5.36 Motor pole pitch
Coding
Bit SP FI DE TE VM DP ND RA NC NV PT US RW BU PS
2111
Range 0 to 655.35mm
Default 0.00mm
Second motor
parameter
Pr 21.31
Update rate
Background read
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