Figure 9: Wiring diagram of a 2-wire connection
Callout
Description
A
Isolators
B
Compatible analogue devices (Fire detector, Input modules, Output modules, Manual
callpoints)
C
T connection
Connecting the FC500 repeater
For an example of how to connect two FC500
repeaters, see Figure 11.The RS485 port of the
FC503, terminals [GND], [A], [B] and [24V], accepts
up to eight FC500 repeaters. Terminals [A] and [B]
supply the power (27.6 V) to the repeater panels.
When a mains fault occurs, the repeaters decrease
the absorbed power, switching off the LCD display
backlighting. By pressing a key, the LCD display
backlighting switches on again for 20 seconds.
However, the absorption of the repeaters continues
to run down the backup batteries and decreases the
stand-by supply time of the system.
As there is only one control panel in the system,
it must supply the repeaters with power, unless a
power supply station is in the system.
Use only shielded cable, with one end connected to
the earth terminal of the control panel and other
left free; secure the continuity between several
segments of connection.
Figure 10: Wiring diagram of a 4-wire connection
FC503 and FC506 Addressable Fire Control Panels
27
Johnson Controls - CONFIDENTIAL
