Catastrophic Lib Communications Fault From A Consecutive Group Of Libs; Drift Compensation Error - Pittway NOTIFIER AM2020 Troubleshooting Manual

Catastrophic LIB
Communications Fault
From a Consecutive
Group of LIB's.

Drift Compensation Error.

10
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above 80% of the alarm threshold, and remains there for 26 consecutive hours
(60 seconds for pre-alarm). If at anytime the level drops below 80%, the 26 hour
(60 seconds for pre-alarm) timer is reset.
Note: Addressable thermal detectors cannot cause a "Maintenance Required" or "Pre-
Alarm Alert" trouble.
Corrective Action:
1) Clean or replace the addressable detector. To do this, remove the old
detector. Wait approximately three minutes and replace with the new detector.
Allow several minutes for the trouble to clear.
2) If the trouble persists, call Notifier Technical Support.
If a group of consecutively placed Loop Interface Boards, such as (3,4,5 and 6)
or (7,8,9 and 10) are all experiencing catastrophic communications faults, this
could be a clue to the solution. Since the Loop Interface Boards all share a
common Interconnect Chassis Assembly (ICA-4/ICA-4L), this may be the
problem.
Corrective Action:
1) Using proper power removal procedure, move each of the LIBs that are
experiencing the problem to a LIB position that is functioning properly and
reapply power using proper power up procedure.
2) If each of the "problem" LIBs function in their new position, replace the faulty
ICA-4/ICA-4L chassis and return the LIBs to their original positions.
For more information on LIB corrective action, refer to Section Five, Trouble
Code T18.
AM2020/AFP1010 software is designed to automatically compensate for
detector chamber sensitivity drift due to contamination in SDX-551/751 Photo-
electric and CPX-551/751 Ionization detectors. If the detector sensitivity drifts to
such an extreme that the panel cannot compensate for it, this error will be
generated.
Note: FDX-551 Thermal detectors cannot cause a Drift Compensation Error.
This software-based compensation meets NFPA 72-1993, Chapter 6 "Inspection,
Testing and Maintenance" periodic testing and maintenance requirements
without removing and testing each detector in the system.
Alarm sensitivity in a detector's chamber tends to increase over time. This
increase is caused by chamber contamination. In time, if the clean air level
exceeds the alarm threshold, a false alarm occurs. Drift compensation elimi-
nates this problem by increasing the alarm threshold as needed to maintain a
constant sensitivity. When the detector is too dirty to be compensated, the Drift
Compensation Error will occur.
Drift Compensation may be enabled or disabled in Full or Partial System
Programming.
AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
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