INSTALLATION
MAN0987_Iss 2_09/16
17
FSL100 Series Flame Detectors
Technical Handbook
5.5 Electrical Connection (General)
The flame detector has several wiring options; the most important are:
1.
Wiring to a fire control panel using the ‘current increase’ principle.
2.
Wiring to a PLC using a 0-20 mA output.
3.
Wiring with an additional manual self-test.
4.
Stand-alone wiring, with direct use of relays.
Options 1 to 3 are explained in this chapter, and Option 4 is shown in
Chapter 5.4 Wiring Diagram
.
5.6 Wiring to a Controller (General):
1.
Use multi-core, shielded, twisted pair cable with earth (ground), depending on the panel and the type of connection. The
isolation resistance to ground must be at least 500K Ohm.
2.
Core size must be 0.5 to 1.5 mm
2
(20 to 16 AWG).
3.
The length and diameter of the wires should be selected so that the flame detector will have sufficient power under all
conditions (normal and alarm) to ensure that the operating voltage is never below 10 VDC, especially when in alarm mode.
4.
On the flame detector side of the cable leave a 10 cm (4 in) loop of spare cable to allow for alignment of the detector.
5.
Grounding on the flame detector side: ensure that the screen cannot make an electrical connection with ground or with the
electronics in the detector housing. Ensure that the electronics in the flame detector housing are isolated from local ground
to avoid potential differences (ground loops).
6.
Do not connect more than one flame detector per loop.
The flame detector has a cable gland fitted with an 8 mm insert. Use the cable gland with the insert for cables from 5.5
– 8 mm
diameter. Remove the insert for cables of 8
– 13 mm diameter.
Figure 10.
FSL100 Cable Gland with and without Cable Entry Insert
Warning
The cable Earth (Ground) core must be connected to Protective Earth via the Controller power supplies, and the
cable screen must be connected to the controller’s common earth (ground) point.
The cable armour or conduit must be bonded to Protective Earth at regular intervals while being isolated from
the cable screen, cores and controller.
Avoid earth (ground) loops at all times.
