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Page 9
LOOPSENSE EN54
INSTALLATION & COMMISSIONING
6.1.4
Earth & Earth Fault
If a resis
tance of <50Ω exists between 0V and the building earth a fault indication
will be indicated.
Resistance to Earth
Status
< 50
Ω
Earth Fault
50 ≤ to ≤ 500 KΩ
Indeterminate
> 500 K
Ω
Normal
6.2
Battery Charger
The battery charger is an integral part of the Power Supply and is capable of
Recharging standard sized system batteries within 24 hours
Detecting a missing, damaged or undercharged battery
Protecting the battery against reverse or a short circuit condition
Charging batteries in line with Sealed Lead Acid battery manufacturers circuit temperature
compensation guidelines
The following table contains the thresholds for the corresponding battery faults:
Battery Voltage
Battery Fault Condition
VBATT < 23.5V
BATTERY LOW
VBATT < 20V
BATTERY MISSING
*VBATT < 22V
BATTERY DAMAGED
Note:
Battery disconnect has been incorporated to prevent the battery from discharging through
the battery charger should the charging voltage be less than the battery voltage.
CHASSIS EARTH
TERMINAL
EARTH ( GREEN )
ACTIVE ( BROWN )
NEUTRAL ( BLUE )
NOTE: MAINS CABLE
SHOULD BE NO LESS
THAN 0.75mm
CABLED TO THE MAIN
BOARD
+BATT-
FOR CONTINUED PROTECTION
AGAINST RISK OF FIRE REPLACE
ONLY WITH SAME TYPE 2A FUSE
O
F
F
O
N
METAL
COVER
DC OUTPUT
OV
+27V
CAUTION:
ETH
SNS
1
1
2
6
8
4
3
5
7
(AC IN)
TO THERMISTOR
EXTENSIONS OF PIN 1
(TEMPSENSE RTN) AND PIN 6
(TEMPSENSE) OF RJ45
RJ 45 PINOUT CONNECTIONS
1.TEMP SENSE RTN
2.SUPPLY SENSE
3.PSU V ADJ
4.CHARGER ON
5.LOAD ON
6.TEMPSENSE
7.BATTERY V SENSE
8.OV
1 2 3
C N 2
C N 5
C N 5
C N 2
TB2
TB1
S W 1
F1: 2A
Fuse
Battery 2
12Volts
Battery 1
12 Volts
+
-
-
+
2
27V TO THE MAIN CARD
A
DC ON
LED
DANGER
N
MAINS CABLE
FERRITE CORE
COMBINED MAINS SWITCH
& MAINS ON INDICATION
HIGH VOLTAGE PRESENT
INDICATOR UNDER CAGE
Figure 5: Power Supply Battery Charger Wiring (3A PSU SHOWN
6.2.1
Connecting the Stand-By Batteries
The capacity of the batteries to be installed depends on the panel configuration and required stand-
by time. To calculate the required AH capacity of the batteries refer to the calculation guide located
in the rear of this manual.
Two new, good quality and fully charged 12V Sealed Lead Acid batteries are required as the
emergency stand-by power supply for the Panel. They are to be mounted in the bottom of the
cabinet. In the ABS version a protective tray is supplied in the packaging.