Installation & Commissioning of Control & Monitoring Add On’s
Page: 18
The Agent Release Termination Board interfaces to the;
1.
The FACP via CN1, CN2 continuing the RS485 communications bus if required. LK1 is
inserted if this is the last backpan board on the bus.
2.
LCS’s ( up to 4 ) via TB1. LK1 is inserted in the last board in the RS485 Bus
3. Monitored
Inputs:
via TB2. ( EOL Resistance 22K
Ω
, Series Resistance 4K7
Ω
)
(a)
Pressure Switch (
PSW
) agent released
(b)
Low Pressure Switch (
LPSW
) agent storage cylinder pressure has dropped to a pre-
determined level; and
(c) Inter
lock
, the manual lock-off valve has been operated.
4. Gas
Fired:
Output via RL2 N/O contacts rated at 1A @ 24VDC wired to TB3. Used to
indicate to other monitoring devices the agent has been released.
5. Sys
tem
Inop
erative: via RL1 N/O contacts rated at 1A @ 24VDC wired to TB4. Used to
warn by way of signage / audible alarm and/or monitoring that the system is inoperative.
6. Stage
1:
Output; initiates the visual and audible Fire Alarm and Evacuate warnings.
(a)
Monitored; via RL4 C/O contacts wired to TB5 1 & 2 ( EOL required 10K
Ω
) and
(b)
un-monitored; via RL5 N/O contacts wired to TB5 3 & 4.
7. Stage
2:
output; initiates the visual and audible Fire Alarm and Do No Enter warnings
(a)
Monitored; via RL6 C/O contacts wired to TB6 1 &2; ( EOL required is 10K
Ω
) and
(b)
Un-monitored; via RL3 N/O contacts wired to TB6 3 & 4
8. Release:
Main
actuating circuit, monitored (10K
Ω
EOL required) via TB7 1 & 2 ( 2A current
limited ),
Release: Reserve
actuating circuit, monitored (10K
Ω
EOL required) via TB7 3 & 4 ( 2A
current limited )
(a)
To Pyrogen Igniter ( max of 10 )
(b)
Metron Igniters ( max of 10 – a series 2watt 18
Ω
resister must be added to the circuit )
(c)
Solenoid valve ( max current of 2 amps & 27VDC )
5.6 Interface
Wiring
Monitored Inputs TB2 1 & 2
Pyrogen,
This input relies on a thermal fuse used in conjunction with 22K
Ω
EOL and 4K7
Ω
series resistors. The type of agent release mechanism has to be set in the
Programming Menu for the input to function as per the manufacturers specifications
and be in accordance with the relevant Standard.
1 2
PSW
TB2
Termination Board
4K7
22K
EOL
Pyrogen
Canister
+ -
Pyrogen
Release
Point
FUSE
Pyrogen Release
Brd. 302-740
To TB7
MAIN or
RESERVE
Release
MAIN / RESERVE
RELEASE
TB1
-V
E
+V
E
17/10/00
D1
R1
C1
C2
R2
TB2
302-7400
Figure 27: Pyrogen Wiring
