Siemens FIREFINDER-XLS Installation, Operation And Maintenance Manual page 58

FIREFINDER-XLS INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Adjusting the Alarm
Threshold When a New
Zeus is Uploaded
Ongoing Adjustments of
the Alarm Threshold
IEC Trouble Conditions
6
APPENDIX
After FireFinder-XLS checks that the actual ID of a device with IEC agrees with Zeus,
it adjusts the detector's alarm threshold according to the data stored. The first
adjustment occurs after 100 hours of data accumulation. In the case of power cycling
or resetting, adjustments begin within 90 seconds.
If a detector with IEC reports an alarm condition before the detector's alarm thresh-
old is adjusted, the alarm delays until the alarm threshold is adjusted. If the device
continues to report an alarm condition once its alarm threshold is adjusted, the alarm
reports.
If the Zeus and the device ID do not agree, the IEC for that device does not activate
until the trouble condition is removed from the system and the panel is reset.
Environmental conditions usually cause a small change in the analog voltage over a
long period of time. At regular intervals FireFinder-XLS collects analog data for each
detector with IEC and adjusts the alarm threshold accordingly. FireFinder-XLS adjusts
for both up and down changes in the analog voltage. In addition, if system power is
lost, FireFinder-XLS adjusts the alarm thresholds as needed by using stored data.
A trouble condition involving the IEC may be annunciated by the FireFinder-XLS PMI
as:
PRE-DIRTY ANALOG VOLT. REACHED
OR
IEC LIMIT REACHED. SERVICE REQ
The trouble conditions shown above are annunciated on a detector-by-detector basis
as each detector is checked.
FireFinder-XLS annunciates a trouble condition for a detector when its alarm threshold
reaches a predetermined limit. The operator should acknowledge the trouble, clean
the detector if possible, and reset the control panel. If the detector is not cleaned, the
control panel annunciates this trouble condition after every panel reset until the
detector is cleaned.
| APPENDIX C