Pertronic Industries Ltd
2 of 2
Loop Responder Issue2 Sept 2002
Loop Connection Limitations
1) Supplied from the analogue loop only:
Loop power for each Responder (no external supply):
24V, 30mA (no detectors, 10K EOL only).
For
Switch Input operation:
add no extra current.
For
Smoke Detector operation:
Add 2 mA for each group of 20 smoke detectors.
Add 20mA for activated smoke alarms for each circuit.
Short circuits add no extra current.
Loop Powered example 1 (10 Responders – Switch Input types):
10 Responders at 30mA each require
300mA
Loop Power Total
300mA
50mA
is
available for other loop devices.
Loop Powered example 2 (3 Responders – Smoke detector types):
3 Responders with 20 smoke detectors per circuit require
138mA
Allow for 5 activated smoke detectors
100mA
Loop Power Total
238mA
112mA
is
available for other loop devices.
2) With external supply:
Loop power for each Responder using an isolated external supply:
24V, 5mA. (The external supply powers the circuits).
Isolated external supply current for each Responder to power the circuits:
24V, 25mA (no detectors, 10K eol only).
Add 2 mA for each group of 20 detectors.
Add 20mA for activated smoke alarms for each circuit
Short circuits add no extra current.
Isolated External Supply example (8 Responders):
8
Responders
require
40mA
Loop Power Total
40mA
8 Responders with 20 smoke detectors per circuit require
328mA
Allow 10 activated smoke detectors
200mA
External Supply Total
528mA
310mA
is
available for other loop devices.
Externally Powered Connection Diagram
LK1 Location and Base Address Selection
Multiple Loop Responders may
be powered from one external
power supply. The Loop
Responders can be on different
loops.
