C Intelligent Enviromnental Compensation - Siemens FIREFINDER-XLS Installation, Operation And Maintenance Manual

C
INTELLIGENT ENVIRONMENTAL COMPENSATION (IEC)
Initial System Power-Up
Intelligent Environmental Compensation (IEC) is an optional feature that permits the
FireFinder-XLS system to compensate automatically for environmental changes (such
as dirt and dust buildup) in the analog voltage of an HFP-11 detector. The selection of
IEC devices is made in the Zeus programming tool.
Once a detector is chosen to be covered by IEC, FireFinder-XLS stores and analyzes
the analog readings of the smoke detector and adjusts the detector's threshold
upward or downward, as necessary, to maintain a constant sensitivity.
As the analog voltage increases due to environmental factors, an equivalent increase
in the detector's alarm threshold prevents factors other than smoke from causing an
alarm. This method maintains the selected detector's sensitivity.
Typically, the analog voltage changes slowly over long periods of time for environmen-
tal factors, but changes quickly over short periods of time for actual smoke.
When a new or modified Zeus configuration is loaded into a system, the FireFinder-XLS
PMI goes through an initial system power-up. FireFinder-XLS does not keep the IEC
option where it was formerly applied when this new system powers up. The IEC
memory re-initializes, and then FireFinder-XLS begins adjusting the alarm thresholds
wherever IEC is selected in the new Zeus configuration.
SENSITIVITY
VOLTAGE
Alarm
Threshold Voltage
Analog Voltage
0 Volts
APPENDIX
5