The Alarm Relay Card
The Alarm Relay Card mounts on, and is driven by, the SPS. It has 3 relays, each
providing one set of voltage-free contacts. It is fitted to the basic 4100ES-S1 as standard.
The relays are able to be configured under custom control, but the default operation is for
system status, i.e. Fault (Trouble), Isolate (Supervisory), and Alarm, respectively. These
are commonly used to drive the Brigade signalling device (ASE or PPU/AIU). See the
next section for more details about Brigade Devices.
Figure 4-1. The Alarm Relay Card
The Alarm Relay Card mounts on the SPS adjacent to the largest relay K3. With the
power disconnected, fit the card using the three plastic stand-offs and one Torx screw
with plastic sleeve.
Connect P4 on the relay card to P7 on the SPS with the 10 way FRC provided.
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