Esser 8000C - Page 112

Page 112
Fire Alarm Computer 8000C / M
Mode of analog loop operation
The
esserbus
®
/esserbus
®
-PLus
is a monitored two-wire loop fed from two sides and exhibiting
ring topology. The use of zone isolators allows you to combine ring and spur loops as well as
divide the analog loop into 127 detector zones with a total of 127 loop devices. All esserbus
®
loop
devices remain functional in the event of interruption (break in wire) in the analog loop. If a short
circuit occurs, only the faulty element between two zone isolators will be disconnected. Even
during this malfunction all other loop devices remain operational.
On the esserbus
®
it is possible to group special fire detectors and manual call points in separate
detector zones. You may also simultaneously operate esserbus
®
transponders in separate
detector zones on the analog loop. The esserbus
®
transponders are decentralized input/output
modules capable of being installed as loop devices on the esserbus
®
.
Commissioning a wired and functional analog loop requires use of the service PC and the software
Customer Data Editor 8000C / M Version V2.27 or higher
. This customer data editor initiates an
automatic wiring recognition function on the analog loop and addresses all esserbus
®
loop devices
automatically. There is no longer any need to set addresses manually. The customer data entry
program is then used for programming how you want individual detectors to be assigned to the
detector zones. Programming the FACP 8000C / M is described in Customer Data Editor
8000C / M.
Operation of zone isolators
The zone isolators for intelligent fire detectors (9200 series) are integrated in special detector
bases (part no. 781493). An additional circuit board with the function of a zone isolator may be
installed in the esserbus
®
transponder. A short circuit on the analog loop will cause the cut-off
relays to open in the relevant zone isolator and disconnect the faulty segment (e.g., a detector
zone) from the analog loop. The disconnected detectors will be shown on the alphanumeric
display with trouble message Com.trbl (communication trouble). All other loop devices on the
analog loop, as well as the fire detectors or esserbus
®
transponders whose zone isolator has
triggered, will remain operational. The zone isolators do not work on an open circuit, e.g. break in
wire. Bi-directional ring interrogation keeps all loop devices on the analog loop functional.
VdS
In VdS-approved systems, failure of a maximum of 32 detectors on the analog loop, e.g.,
a
detector zone, is permissible in the event of a trouble incident. A zone isolator must b
e
installed in at least the 32nd detector in a detector zone.
A
nalog loop modulee