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The SPS has one programmable relay, Aux 1, with one set of voltage-free contacts (see
below). It also has provision for mounting a 4100-6033 Alarm Relay that has 3 relays,
each with one set of normally open (or normally closed) contacts available on a screw
terminal block (see fig 6.1).
• The relay must be configured in the Programmer.
• The relay circuit is rated to switch 2 A at 30 VAC or 32 VDC, resistive load.
• Relay contacts are Form C voltage-free contacts (but with a 40V transorb from
common to Earth. Do not switch voltages greater than the rating, or damage may
result.
• When power through the relay contacts is provided by the SPS 2 A Auxiliary Power,
wiring is
power-limited.
• The relay circuit is not supervised.
The three relays have default functions of Fault (trouble), Isolate (supervisory) and
Alarm, and are typically used for Brigade Signalling (refer to chpt 10).
• The relays may be configured by the Programmer for alternate functions.
• If used as Brigade relays, the jumper must be fitted to the bottom position on P3 on
the SPS. If Fault (trouble) is programmed for an alternate function it must be fitted
to the top position.
• Only one pair of contacts is available for each, and is configured as normally open
(NO) or normally closed (NC) by fitting a jumper on the adjacent headers P1
(Alarm), P2 (Isolate) and P3 (Fault). Use top position for NC and bottom position
for NO.
• The relays are each fuse protected (fuse 5 x 15mm, rating 3 A).
• Relays are not supervised.
Continued on next page
SPS Relay Wiring
Overview
Aux 1 Relay
Alarm Relay Card