Brooks ALARM 2000, Site Manual

Page: 12 / 70

Site Manual
Alarm 2000 Iss 5
12
3.2.4 Field Wiring:
All field wiring enters the RFIP via knock-outs on either the top or rear of the enclosure.
Termination is via compression terminals located on the ‘termination’ board specific to the
module options fitted.
3.2.4.1 Mains Voltage Input:
The 230 Vac mains cable terminates at a 3-way junction box located on the inside rear of
the cabinet with switched outputs to the switch mode power supply and the Smoke Alarm
main Termination Board.
3.2.4.2 Battery Input:
Colour coded battery leads are provided to connection of the standby batteries to either
a) Power supply supervision card, where fitted; or
b) The Switch Mode Power Supply through an isolating diode (1N5404-3A) where
the power supply supervision option is not fitted. The diode is used to isolate the
DC power of the batteries to the DC power of the power supply so the mains on
LED will extinguish in case of power fail.
The battery leads are colour coded to ensure correct fitting to the batteries. Connect the
black lead to the negative terminal of the first battery, red lead to the positive terminal of
the second battery and the blue lead between positive of the first battery to the negative of
the second battery.
Note: If the Power Supply Supervision Card is not fitted, ensure that the circuit
breaker TH1 and link LK1 are fitted to the RFIP main Termination Board.
3.2.4.3 Smoke / Heat Alarm Field Wiring:
The Smoke/Heat Alarms are wired according to whether the isolate function is
incorporated in the system.
(a)
Without isolate function - 3 Wire Systems:
If the alarm isolate facility is not required, the Smoke/Heat Alarms will be terminated
to TB1 on the Main Control and Termination Board mounted on the rear of the
enclosure. Connect Active (brown) to “A”, Neutral (blue) to “N” and Interconnect
(white) to “I” (refer to Drawing No. F563).
Note: The two blue wires must remain linked.
(b)
With isolate function - 4 Wire Systems:
If the alarm isolate facility is required, the Smoke/Heat Alarms will be terminated to
TB2 on the Main Control and Termination Board. To terminate the Smoke/Heat
Alarms in a 4 wire system, the two blue wires (normally used as Neutral) must be
separated to a Neutral and Battery negative as shown in the block wiring diagram
F563. Connect Active to “A”, Battery negative to “N1”, Neutral to “N2” and
Interconnect to “I”.
Warning: The battery negative and neutral should not be interchanged.
3.2.5 Transient Suppression:
The RFIP provides transient suppression comprising metal oxide varistors (MOV’s) on all
inputs and outputs on the main Termination Board and on all the optional modules.