Quadnet Control Panel Engineering and Commissioning Manual
19
Inputs 1- 4: MI+, MI-, SCRN
Inputs 1-4 may be configured to monitor for open and short circuit faults using a 3k3 EOL resistor, and to
activate an alarm link using a 680R ‘firing’ resistor.
Terminal
Description
MI+
Monitored Input positive connection
MI-
Monitored Input 0V connection
SCRN
Field cable screen connection
Fuses 1-3: FUSE 1, FUSE 2, FUSE 3
The fuses are located towards the top of the back plane PCB.
Blown fuses are easy to spot using the LED adjacent to each fuse. This will switch on if the output is
switched on (even in the passive state) and the fuse is blown.
Label
Description
Fuse
FUSE 1 Output 5
F315 mA
FUSE 2 Output 6
F315 mA
FUSE 3 Auxiliary Power
F315 mA
Addressable Circuit Loops 1- 4: END1+, END 1-, SCRN, END2+, END2-, SCRN
Each loop 1-4 addressable circuits must be connected to its
appropriate End 1 and End 2 terminals.
Communications normally run from Loop End 1 but, in the event of
a continuity fault, both ends of the circuit will operate.
It is important that the cable screen is only connected at the control panel (using the SCRN terminal
provided, not at any earthing point), and that the screen continuity is maintained at all times. 4-core cable
must not be used as a loop ‘feed & return’ due to the possibility of data corruption.
Terminal
Description
LOOP END1+
Circuit End 1 positive connection:
+VE OUT
LOOP END 1 -
Circuit End 1 0V connection :
0V OUT
SCRN
Field cable screen connection:
SCRN OUT
LOOP END2+
Circuit End 2 positive connection:
+VE IN
LOOP END 2 -
Circuit End 2 0V connection :
OV IN
SCRN
Field cable screen connection:
SCRN IN
MI-
MI+
SCRN
ON BOARD PCB
FIELD CONNECTIONS
3K
3 E
OL
SCREEN
68
0R
N/O CONTACT
FIRE RESISTOR
END1-
END1+
SCRN
MAIN PCB
FIELD CONNECTIONS
SCREEN
END2+
END2-
SCRN
SCREEN
