Dc Power Connections; 15.1 General - Honeywell 5704 Operating Instructions Manual

MAN0448_Issue 13_01-2010
005704-M-5001 A03249
CHAPTER 4 - INSTAllATION INSTRUCTIONS
15.

DC POWER CONNECTIONS

15.1 General

The ratings of power supplies should be checked by calculating a
system power budget as outlined in Section 5.
DC power is connected to the System 57 via the DC Input Card terminal
block TB1 and via the Quad Relay Interface Cards.
The DC Input Card provides diode isolation to permit the connection
of two separate power supplies. eg. A mains derived dc power supply
and battery backup dc supply. Note that current will be drawn from
the supply input with the highest voltage and in some circumstances
current will be shared between the two inputs. Each of the two inputs
have twin +24V and 0V terminals for easy through power connection
or paralleling of input sources.
A fused +24V output, which is the combination of both dc inputs, is
provided for powering ancillary devices.
Site PSU
24V DC Nominal
Site PSU
Through Wiring
Aux Battery
24V DC Supply
Aux Battery
Through Wiring
24V Output to
Ancillary Equipment
System Earth
Site DC Supply and Auxiliary Battery Backup DC Power Supply
Connections, With Through Wiring
CAUTION
IMPORTANT
The System 57 must be earthed
4-49
5704 Control System
TB1
12
11
10
9
8
7
6
5
4
3
2
1
FS1
10A