CHAPTER 7: CONNECTING FIELD WIRING TO THE D20E MODULE
D20E ETHERNET I/O MODULE INSTRUCTION MANUAL GE INFORMATION 91
Form C control outputs
The Form C control output is a dry contact output. The control uses two complementary
outputs (see
Figure 20):
• One normally open, and
• One normally closed.
There are 32 Form C control outputs that can be configured on the D20E-K.
Figure 20: Form C outputs
Raise/Lower control outputs
A Raise/Lower control output 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 (see Figure 21):
• One for the raise and
• One for the lower.
This supports 16 Raise/Lower control outputs using 32 select relays on the D20E-K.
Figure 21: Raise/Lower outputs
DPST control outputs
Each Double Pole Single Throw (DPST) output only requires one relay to be energized to
perform a control output operation. Both supply polarity leads are switched (see
Figure 22).
Figure 22: DPST outputs
DPST outputs are shown as DO(+/‒) in Table 23. 32 single DPST outputs are available on the
D20E-K.
The wiring connected to terminal block TB2 must not have exposed accessible
conductors.
The wire and cable connected must have at least a +80 °C temperature rating.
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