90 GE INFORMATION D20E ETHERNET I/O MODULE INSTRUCTION MANUAL
CHAPTER 7: CONNECTING FIELD WIRING TO THE D20E MODULE
Control output external supply
The external control output supply connections must be made on TB2-54(+/‒) and
TB2-1(‒/+) in order to facilitate the Remote/Local switch. For the D20E-K (DB25) Interface:
TB2-3(+/‒) and TB2-1(‒/+).
Remote/Local switch
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.
Figure 18 shows the location of the REMOTE/LOCAL
switch.
Figure 18: D20E-K REMOTE/LOCAL Switch
The D20E Remote/Local switch is disabled by default. To enable the remote/local switch,
follow the procedure described in section:
Operation of control output points on page 73,
and enable Control. For example, the remote/local switch must be enabled for operation
with the D20MX Substation Controller.
Trip/Close Control Outputs
Trip/Close control outputs require the closing of two relays before voltage appears at the
control output. The two relays must be either a Master Trip relay or a Master Close relay,
and the associated select relay for the control output to be operated.
Figure shows the Trip/Close control output path. For the Trip/Close configuration the
control supply is connected between on TB2-54 for positive polarity and TB2-1 for negative
polarity. There are 32 dual Trip/Close outputs supported on the D20E-K.
Figure 19: Trip/Close outputs
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