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D20E-C module -
control output
external supply
D20E-C module -
Local/Remote switch
D20E-C module - Trip/
Close control outputs
D20E-C module - DPST
control outputs
D20E-C module - Form
C control outputs
D20E-C module -
Raise/Lower control
outputs
100
The control output supply must be provided from an external supply. The supply
connections must be made on:
•
TB2-2(+/‒) and TB2-51(‒/+) for either Trip/Close or Raise/Lower outputs
•
TB2-1(+/‒) and TB2-51(‒/+) for DPST or outputs, and facilitate the Remote/Local switch
for all output types.
See Table 26 for termination block details.
The remote/local switch (S1) disables the operation of control outputs when in the local
position. Both the external control output supply and the control relays are disabled by
switch S1 when in the local position.
The switch is located between TB1 and TB2.
Trip/Close control outputs require the closing of two relays before voltage appears on the
control output. The two relays must be one of the Master Trip or Master Close and the
associated select relay for the control output to be operated. Having both the Master Trip
and Master Close relay switching on simultaneously is not allowed and is prevented by the
D20E-C.
See Table 26 for termination block details.
Figure 19 shows the Trip/Close control output path. For the Trip/Close configuration the
control supply is connected between on TB2-2 for positive and TB2-51 for negative. 8 dual
Trip/Close outputs are supported on the D20E-C.
The Double Pole Single Throw (DPST) outputs require only one relay to be energized to
perform a control. Both supply polarity leads are switched. Figure 22 shows the DPST
control output path.
DPST outputs are shown as DO(+/‒) in Table 26.
There are 8 single DPST outputs available on the D20E-C.
The Form C control is a dry contact output. The control uses 2 complementary contacts:
•
One normally open, and
•
One normally closed.
There are 8 Form C control outputs that can be configured on the D20E-C. Figure 20 shows
the Form C output contacts.
A Raise/Lower control uses either a raise relay or a lower relay to increment or decrement
a value (i.e.: tap changer).
Each Raise/Lower set uses two control output select relays:
•
One for the raise and
•
One for the lower.
This provides support for 4 Raise/lower control outputs using 8 select relays on the D20E-C.
Figure 21 shows the Raise/Lower output configuration.
GE INFORMATION
CHAPTER 7: CONNECTING FIELD WIRING TO THE D20E MODULE
D20E ETHERNET I/O MODULE INSTRUCTION MANUAL
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