31
or closed loop current control. The field current is regulated by the Field PI loop.
Open Loop Field Setpoint (330)
When
Open Loop Field Select
is True, this parameter controls the
Field Conduction
Angle
. Note that this signal can be scaled down if the drive enters the Field Economy mode.
Field Conduction Angle (328, Read-Only)
This parameter shows the level of field conduction. In open loop operation, this parameter is
equal to the
Open Loop Field Setpoint
. In closed loop control, this is the output of the Field
PI Loop.
Field Economy Enable (332)
The Elite Pro Field Economy feature can help extend the life of a motor by reducing motor
heating due to the field. The field voltage or current can automatically be reduced when the
drive is in the Stop mode after a 3 minute delay. The field will automatically return to its
normal level when the Run or Jog mode is entered. This feature can be enabled by setting
this parameter to True. In open loop mode, the field is reduced by about 56%. In closed loop
control, the field current is reduced by 50%. If the
Min Field I Demand
(Field Crossover
block) parameter is set to a value other than 0.00%, the field is reduced to this value.
Field IFB (Current Feedback) Offset (342)
This adjustment allows any offset in the Field IFB circuit to be nulled. Proper adjustment
should yield 0.00% at the
Field Current Feedback
parameter when no field current is
present.
Field Voltage Feedback Offset (343)
This adjustment allows any offset in the Field VFB circuit to be nulled. Proper adjustment
should yield 0.00% at the
Field Voltage Feedback
parameter when no field current is
present.
Field Amps (338, Read-Only)
This parameter contains the actual field current in amps. This value is scaled by the
100%
Field Amps
only when the
Field Current Feedback Select
is set to external.
Field Voltage (335, Read-Only)
This parameter contains the actual field voltage in volts.
Field Current Feedback Select (487)
Set this parameter to external when interfacing to an external field current regulator.
External Field Current Feedback (488)
This parameter is used when interfacing to an external field current regulator. Typically, an
analog input is used to provide the current feedback signal.
100% Field Current (489)
Scales the
Field Amps
display only when
Field Current Feedback
is external.
7.9 Field Crossover Block
Field Crossover (also called field weakening or constant horsepower) control allows motor operation
above base speed by reducing the field current. Stable operation is achieved by allowing the
armature voltage to control the field current. An external tachometer or encoder feedback signal is
necessary for proper operation (i.e. armature feedback cannot be used).
Figure 16
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