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Relay Switching Basics
2.3
Multiple pole configurations
Multiple pole configurations are possible by energiz-
ing two or more relays at the same time. A four-pole
single-throw (4PST) switch system can be configured
using two relay channels. Both loads are selected when
the two relays are energized. Each additional relay
adds two poles to the switch system.
Card 1, Channel 1
Card 2, Channel 1
Figure 2-2
4PST configuration using card pair
2-2
H
IN
L
H
IN
L
Both Relays Energized Simultaneously
A convenient way to perform multiple-pole switching
is to use two Model 7013 switch cards; one installed in
Slot 1 of the mainframe and the other installed in Slot
2. By using the Card-Pairing feature of the Model 7001,
closing a channel on Card 1 will automatically close the
corresponding channel on Card 2. For example, closing
channel 1 on Card 1 will automatically close Channel 1
on Card 2 providing 4PST switching, as shown in Fig-
ure 2-2.
H
OUT
L
H
OUT
L
Load A
Load B
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