Appendix D - old Mains powered interface unit
FOR INSTRUCTIONS ON THE NEW MAINS INTERFACE REFER TO
THE LEAFLET SUPPLIED WITH THE PRODUCT.
Ratings
Zone
(input)
24V nominal 2mA
maximum
Link Position Meaning
Sector
(output)
24V nominal 500mA
maximum (500mA
total for all sectors)
LK1 1-2# Normal zone voltage
Auxiliary
power
output
24V nominal 250mA
maximum
LK1 2 - 3 Low zone voltage
‘Reduces the zone voltage
by 4V for Thorn detectors’
LED1
(green)
When lit it indicates
local mains power is
healthy
LK3 1 - 2#
Fail safe disable
LED2
(yellow)
When lit it indicates
communication with
loop circuit has
failed
LK3 2 - 3
Fail safe enable
# - factory settings
S5 - rotary
switch
0 -GENT detectors
S6 Reset push button (fail
safe)
Fail safe mode
¨
In this mode if there is a loop communication failure lasting over 1 minute duration, then all
the outputs of the unit are activated (switched On). The outputs deactivate on restoration of loop
communication. On pressing the reset button on the PCB you can restore outputs to their
normal state.
¨
If there are three communication failures over 10 minutes duration the outputs will be latched
On, in this case the unit must be powered down and powered up again to unlatch and restore the
unit for normal operation.
Commissioning instructions
82 4188-949 issue 3_05/10_Nano Comms inst.
Appendix D - old Mains powered interface unit
S1-
S1+
EARTH
Z1
ZC1
End-of-line
Capacitor unit
End-of-line
Resistor
1234
S1 to S4
SWITCHESS1toS4
MUST BE SET BEFORE
POWER UP
SECTOR OFF OFF ZONE
OUTPUT INPUT
P3 to P6
+-
INTERFACE BOARD
+
-
-
+
2 - 12V 2.1Ah
SEALED LEAD ACID
BATTERIES
P3
P4
P5
P6
P2
P7
Aux
P9
Battery
P8
+-
AC AC
FS1 FS2 FS3 FS4
S1 S2 S3 S4
S6
S5
LED1
LED2
FS6
250mA
AUXILIARY
POWER
FUSE
FS5
2.5A
BATTERY
FUSE
BOARD
FIXINGS
POINTS
1
2
3
LK1
LK3
123
OUTPUT /
SECTOR
INPUT /
ZONE
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