II F 2-9
3ADW000072R0501_DCS600_System_description_e_e
2.4 Field Supply
General data
SDCS-FEX-1
• Diode bridge.
• 6 A rated current.
• Internal non adjustable minimum field current
monitor.
• Construction and components have been designed
for an insulation voltage of 600 V AC.
• Output voltage U
A
:
9.0*
%100
%100
*
+
=
TOL
UU
VA
TOL = tolerance of line voltage in %
U
V
= Line voltage
• Recommendation:
Field voltage ~ 0.9 * U
V
SDCS-FEX-2A
• Half controlled thyristor/diode bridge (1-Q)
• Microprocessor control, with the electronic system
being supplied by the armature converter.
• Construction and components have been designed
for an insulation voltage of 600 V AC.
• Fast-response excitation is possible with an appro-
priate voltage reserve; de-excitation takes place by
field time constant.
• Output voltage U
A
:
9.0*
%100
%100
*
+
=
TOL
UU
VA
TOL = tolerance of line voltage in %
U
V
= Line voltage
• Recommendation:
Field voltage 0.6 to 0.8 * U
V
All field power converters (except for the SDCS-FEX-
1) are controlled by the armature converter via a serial
link with a speed of 62.5 kBaud. The link serves to
parameterize, control and diagnose the field power
converter and thus provides an exact control. Moreo-
ver, it enables you to control an internal (SDCS-FEX-
2A) and an external (DCF 601/602/503A/504A) or
two external field supply units (2 x DCF 601/602/
503A/504A). The respective software function required
is available in every DC power converter.
Field converter types
• Currents from 6 to 520 A.
• Minimum field current monitor.
• Integrated or external field power converter or in a
completely separate cabinet.
• 2-phase or 3-phase model.
• Fully digital control (except SDCS-FEX-1).
We recommend integrating an autotransformer in the
field power converter's supply to adjust the AC input
voltage to the field voltage, to reduce the voltage and
current ripple of the field.
SDCS-FEX-1
SDCS-FEX-2A
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