F08 Installation & Programming Manual
Document No: LT0082
FIP Installation
2.8
BELL OUTPUT WIRING
2.8.1 GENERAL
At the bottom of J8 terminals "BELLS +" and "0V" are provided for connection to external bell
circuits. The Bell Output is a switched 24V DC output, derived from +VB through the Bell
fuse F1.
NOTES:
1)
Connect ONLY 24 VDC devices.
2)
Observe correct polarity for polarised devices, eg electronic sirens.
3)
Maximum load current is 1.0 Amps as the bells are an inductive load. (Please note
total load constraints). For heavier loads use an interposing relay.
4)
The "BELLS+" output is fused by fuse F1, labelled "BELLS", and is rated at 1.6 A.
5)
The "BELLS" circuit is not supervised.
6)
Figure 2.11 shows an example of bell wiring.
7)
For optimum suppression install diodes across each BELL.
-
Use diode type 1N4004 (400V 1A) or similar.
-
Note polarity of diode. (Cathode to Bell Positive).
2.8.2 SUPERVISED
BELL
OUTPUT
A supervised bell output can be arranged with an optional 24V Bell Monitor Board (part
number PA0494) and a 24V GP Relay Board (part number PA0730). The Bell Monitor
Board supervises the bell wiring for open or short circuits.
On a fault, the Ext Def- output of the Bell Monitor goes “low” and turns off the relay on the
GP Relay Board, causing the EOLR to be disconnected from the F08’s detector circuit.
The AZC should be programmed as Input Type 1 (default option).
The Bell Monitor Board can support wiring of up to 3 separate branches (each with an EOL
resistor), and a load current of 1.0A (as limited by the F08 Bell Output). The end of line
resistor depends on the number of branches.
Number of Branches
EOL
1
2
3
10k 5%
18k 5%
27k 5%
Note that a diode is required with any device that does not already contain a series diode.
Figure 2.12 shows the wiring arrangement for the Bell Monitor board.
The 10k pull-up resistor should be soldered between the Ext Def- tab and the left end of link
A3. After soldering, check that the solder joints on the bottom of link A3 are still good.
Page 2-18
24 March 2006
Issue 3.04
Summary of Contents for F08
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