30
7.8 Field Loop Block
Figure 15
Field Enable (331, ICR)
Field Enable
must be set to True in order for the Elite Pro to produce any field output.
Field Current Demand (339)
The
Field Current Demand
is an input that sets the desired level of field current.
EPx020-000 thru EPx060-000 models:
%
100
8
×
=
A
Amps
Field
Nameplate
(339)
Demand
I
Field
EPx075-000 thru EPx150-000 models:
%
100
10
×
=
A
Amps
Field
Nameplate
(339)
Demand
I
Field
EPx200-000 thru EPx600-000 models:
%
100
12
×
=
A
Amps
Field
Nameplate
(339)
Demand
I
Field
Final Field Current Demand (427)
The
Field Crossover Output
is subtracted from
Field Current Demand
to produce the Final
Field Current Demand signal. Note that this signal can be scaled down if the drive enters the
Field Economy mode.
Field Current Feedback (336, Read-Only)
The
Field Current Feedback
is used by the Field PI loop to regulate the field current in the
closed loop mode. This signal sums with the Field Current Demand to produce an error signal
that is the input to the PI loop.
Field Proportional Gain (340)
The
Field
Proportional Gain
scales the output based upon the error. Increasing the gain
improves the response of the field but can also increase overshoot.
Field Integral Time (341)
The
Field Integral Time
adjustment eliminates steady-state error. Decreasing the integral
time improves the response. However, setting it too low can cause oscillation. The
adjustment is in seconds and corresponds to the amount of time that the signal would take to
integrate from 0 to maximum with 100% error.
Open Loop Field Select (329)
When set to True, the field supply operates in manual or open loop voltage control. The
Open Loop Field Setpoint
is used as the
Field Conduction Angle
for the field SCRs. This
produces a voltage output on the field. When set to False, the field operates in the automatic
Summary of Contents for Elite Pro EPN020-000
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