ST-72 User's Manual
Document: UM-1007
Revision Level A
58
3.2.2
OPTIONAL DISCRETE RELAY BOARD # 10-0345
An optional
Discrete Relay Board
, shown in Figure 3-3, adds sixteen 5 amp (resistive)
form C relays per sixteen channel alarm board. Each BOARD may be configured via
Diagnostics Menu in the ST-72 for ALARM 1, ALARM 2, ALARM 3 or FAULT for channels
1-16, 17-32, 33-48 or 49-64. Each relay has a LED associated with it indicating whether
the relay is energized. An illuminated LED indicates energized. Alarm groups, or zones,
may be created by connecting adjacent channels together using JP5 as shown. This
creates an
OR
function with selected channels, causing
any
alarm included within the
zone to actuate
ALL
zoned relays.
Failsafe
operation of 10-0345 discrete relays may be
programmed in the
system configuration
. Many ST-
72 applications utilize the five standard alarm relays (
) and sixteen
optional programmable relay board, and do not require discrete relays for each of the
64 alarm events (64 A1s, 64 A2s, 64 A3s & 64 Faults). If discrete relays are needed for
all 64 alarms, then sixteen boards are required. Each 10-0345 is powered with 24 VDC
at TB3 and TB4.
TB5 provides an open collector failure detection output. If communication is lost with
the CPU board or if the relay board’s processor fails, the positive terminal of TB5 is
pulled low.
All relays are rated at 5 Amp for 28 VDC and 250 ~VAC
RESISTIVE
loads.
IMPORTANT: Appropriate diode (DC loads) or MOV (AC loads) snubber devices must be
installed with inductive loads to prevent RFI noise spikes. Relay wiring should be kept
separate from low level signal wiring.
!
Содержание ST-72
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Страница 108: ...ST 72 User s Manual Document UM 1007 Revision Level A 102 Figure 6 4...
Страница 127: ...ST 72 User s Manual Document UM 1007 Revision Level A 121 8 5 2 CHANNEL CONFIGURATION Figure 8 6...
Страница 128: ...ST 72 User s Manual Document UM 1007 Revision Level A 122 8 5 3 COPY CHANNELS Figure 8 7...
Страница 129: ...ST 72 User s Manual Document UM 1007 Revision Level A 123 8 5 4 PROGRAMMABLE RELAYS Figure 8 8...
Страница 130: ...ST 72 User s Manual Document UM 1007 Revision Level A 124 8 5 5 SYSTEM CONFIGURATION Figure 8 9...