page 66 579-1150 Rev M
4010ES IDNAC Fire Alarm System Installation Guide
9.3.5 Search Option C: Last Search Result
This option simply displays the last Earth Fault Search result. If there has been no search since the last system startup, or if the last search
was aborted, the panel displays:
RESULT NOT AVAILABLE.
9.3.6 Completing the Search
When a Location or IDNet Channel Search completes, all of the following occur:
• All slaves automatically reset.
• The FACU turns off the Earth Fault Search trouble pseudo-point.
• The panel displays the specific fault information.
The panel can only return one Earth Fault Search result at a time. If another fault exists, it can only be found via diagnostics after the first
fault is cleared. Faults will continue to appear, one by one, until each one has been found and corrected.
Important: Once you have been directed to an earth ground fault and corrected it, it is recommended that you restart the system (warm-
or cold-start).
Continue to the next topic for a list of search results and their required actions.
9.4 Earth fault search results
There are several types of results that can display at the end of an Earth Fault Search. This section covers all types of results.
Important: Once you have been directed to an earth ground fault and corrected it, it is recommended that you restart the system (warm-
or cold-start).
9.4.1 Non-point faults
A non-point fault indicates a ground that cannot be traced to an addressable point (for example, a shield).
9.4.2 Point faults
A point fault indicates a ground at a specific addressable point. Point faults can be found at any point in the system that connects to field
wiring.
Some IDNet channel point fault examples are illustrated below.
Fault not cleared. The message below shows that an IDNet channel that has been isolated for fault detection still has the earth fault:
CARD 2, IDNET CARD (250 POINTS) M1, EARTH FAULT SEARCH FAULT CLEAR FAIL
Fault between channel output and first isolator. The message below shows a fault between the IDNet channel output and the first
isolator on the line:
CARD 2, IDNET CARD (250 POINTS) M1, CHANNEL OUTPUT EARTH FAULT
4009 IDNet NAC Extender/TrueAlert Addressable Controller faults. The message below shows a fault detected on the 4009 IDNet
NAC Extender before the repeater connected to that circuit is turned on:
CARD 2, IDNET CARD (250 POINTS) M1-18, 4009A NAC EARTH FAULT
Conversely, the following example shows a fault detected after the repeater connected to that circuit is turned on:
CARD 2, IDNET CARD (250 POINTS) M1-18, 4009A REPEATER EARTH FAULT
IDNet isolator fault. The message below shows a fault detected after the IDNet isolator was turned on:
CARD 2, IDNET CARD (250 POINTS) M1-3, IDNET ISOLATOR EARTH FAULT
9.4.3 Fault Not Found
If the message in the lower right corner of the LCD reads FAULT NOT FOUND (for a Location Earth Fault Search) or FAULT CLEAR FAIL (for
an IDNet Channel Earth Fault Search), it means the search could not locate the fault, but it acknowledges that a fault exists.
There are five possible causes for this message:
• There are one or more internal wiring earth(s) in the system.
• There are system defects (hardware or software, such as a failed isolation circuit).
• An intermittent earth exists in the system (it occurs inconsistently and is therefore difficult to track via diagnostics).
• The cable to the service port may be grounded due to the remote PC's 3-prong plug. Use a non-grounded plug adapter to the remote
PC to get rid of the earth ground.
• The fault is on an auxiliary output that was excluded from the search.
The problem may have to be found manually and then corrected in some of the above scenarios.
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