Honeywell 5701 Operating Instructions Manual page 130

MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
CHAPTER 4 - INSTALLATION INSTRUCTIONS
16. DC POWER CONNECTIONS
16.1 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.
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 - 67
5701 Control System
TB1
12
11
10
9
8
7
6
5
4
3
2
1
FS1
10A