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3.3 Loop Wiring connectors
The SLC (detector) circuits should be installed as loops with or without isolator modules. The wiring details are as described below.
Fig. 10: Loop Wiring with Isolators
DO NOT loop the wiring under any terminals. Break the wire run to maintain supervision.
Fig. 11: Connection to Earth Terminals
NS-MN-0030 / 11.2020
•
The detection loop connections are made on terminal blocks at the top of the base card.
•
The 1-loop variant has only one connector available – i.e. Loop 1.
The 2-loop variant has four connectors available. In the 2-loop variant only Loops 1
and 2 are used for connection.
To identify the Loop 1 and Loop 2, refer to Fig. 1, "The Main PCB Layout".
•
The loop is formed by taking wires from the positive and negative terminals, at one
side of the connector on the base card.
•
It is recommended that short-circuit isolators be installed. Install the isolators at
strategic points in the loop (i.e. zonal boundaries) to prevent an external short circuit
from affecting more than a zone in the system.
•
The fire regulations of some regions mandate that all loop devices must be fitted
with isolators, especially when using loop-powered sounders, to ensure that not a
single device is lost because of a loop wiring fault. Many loop devices are now fitted
with internal isolators - check with your supplier for details.
•
In the case of individual loop I/O modules installed for use as Fire Fan control
interface (Fan Start Point, Fan Stop Point, Fan Status Point, Fan Fault Point), it is
required that the Start Point module is installed at an address before the Stop Point
module in the loop, with all the input and output module addresses also set
sequentially.
Connect the screen drain wire to the nearest earthing point in the enclosure.
Installation Guide SMX-AUS
17
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