D-64 Programming
DC590+ Series DC Digital Drive
FLD WEAK VARS : MMI Sub-Menu
In certain applications of a DC motor controller, high speeds can only be achieved by reducing the field current and therefore the resultant torque. This
is termed as the Constant-Horsepower region or Field-Weakening region, and the speed at which it begins is known as the Base Speed.
FIELD CONTROL
Enables and disables the drive motor Field Control.
SETPOINT 171 0.00 to 100.00 %
Field current setpoint as percentage of calibrated value.
This is the proportional gain adjustment of the field current PI loop. The default of 0.10 is equivalent to a real gain of 10.
INT. GAIN 172 0.00 to 100.00
This is the integral gain adjustment of the field current PI loop.
DISABLED/STANDARD/ADVANCED
Activates the additional motor back-emf, gain-limited PI loop for field weakening (field spillover) control.
STANDARD mode uses the control loop to convert the back-emf in excess of the MAX VOLTS setting, into a reduction of the demanded field
current.
ADVANCED mode also adds in a feedforward control term, based on a comparison of the speed feedback to the calculated base speed,
and uses adaptive gain, in both the back-emf and speed control loops, to compensate for the gain effects of reduced field operation.
EMF LEAD 175 0.10 to 50.00
With field weakening control enabled, a gain-limited PI loop is brought into operation. This is the lead time constant adjustment of the field
weakening PI loop. With a default of 2.00, real time constant = 200ms.
Refer to Chapter 5: "Control Loops" for details of Tuning.
This is the lag time constant adjustment of the field weakening PI loop
With a default of 40.00, real time constant = 4000ms.
Refer to Chapter 5: "Control Loops" for details of Tuning.
EMF GAIN 177 0.00 to 100.00
This is the steady-state gain adjustment of the field weakening PI loop.
With a default of 0.30, real gain = 30.
Refer to Chapter 5: "Control Loops" for details of Tuning.
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