page 64 579-1150 Rev M
4010ES IDNAC Fire Alarm System Installation Guide
9.2 Earth fault diagnostics
This section contains instructions on how to use the Earth Fault Search feature of the 4010ES diagnostics menus. The minimum earth fault
detection level for the 4010ES is 10KOhms for all circuits.
Earth Fault Search is a diagnostic search of external field wiring that assists in locating circuits with earth faults. An earth fault occurs
when an electrical circuit is shorted to ground. Although most circuits operate with a single earth fault, multiple earth faults can disable
communications. Because of this, earth faults must be located and repaired.
Earth Fault Search is conducted by the FACU. The diagnostic may be activated using either the front panel interface or the computer port
protocol (CPP), via a service port.
The 4010ES supports two types of Earth Fault Searches:
• Location Search. Searches all circuits at a location. For the purposes of earth fault searching,
- A location is composed of a group of slaves connected to each other via 4010ES comm (local RUI).
- The main panel is defined as all slaves local to the Master CPU.
• IDNet Channel Search. Selectively enables channel isolators and repeaters to detect which segment of the channel wiring has a
fault. Earth faults are detected by one of the following:
- A single designated power supply at a location. The power supply that detects the fault is designated via a jumper setting on the
power supply slave. For any given location, only one power supply should detect earth faults.
- Each 4009 IDNet NAC Extender on an IDNet channel.
9.2.1 General guidelines
Review the guidelines below before initiating an Earth Fault Search.
• Only one power supply per location is configured to detect earth faults.
• For more reliable earth fault searching:
- Use IDNet channel isolators to isolate channel faults to a specific segment of channel wiring.
- Set IDNet channel isolator addresses to the lowest IDNet device addresses, increasing with communication distance from the IDNet
card.
• If an earth fault is suspected on the IDNet channel with multiple isolators, start an IDNet Channel Search before doing a Location
Search. If the Location Search is done first, it may not yield the correct location (this is a by-product of the extended amount of time
required for the IDNet channel to initialize during a Location Search).
Note: The 4009 IDNet NAC Extender has a common ground fault trouble that reports to the panel without running the Earth Fault Search.
• Earth Fault Search detects only one fault at a time. Multiple faults require fixing the first fault and then repeating the search.
• The FACU suspends normal operation for the duration of the Earth Fault Search.
• Location Earth Fault Searches optionally allow exclusion of auxiliary power circuits from the search, so that modules connected to the
24V auxiliary outputs can remain in operation during the search.
• The option to exclude auxiliary power circuits does not apply to IDNet devices, because the entire IDNet communication channel is
isolated during each search.
• During the search, all related troubles are suppressed and a single trouble pseudo-point is activated (P438).
• At the completion of the search, all slaves are restarted and normal panel operation resumes.
Important: The fire panel cannot provide fire protection during an Earth Fault Search.
9.3 Earth fault searching from the front panel
This section describes how to conduct an Earth Fault Search, from selecting the appropriate access code to correcting the fault.
9.3.1 Access level selection
The panel must be at the appropriate access level (2, 3, or 4) in order to run diagnostics. To get to the correct access level:
1. Press the Menu button. The following message comes up (press the Next or Previous buttons, if necessary, to display it):
Press <NEXT> or <PREVIOUS> to scroll Change Access Level?
2. Press the Enter button. Now you are prompted to log in or log out.
1=Login 2=Logout
CURRENT ACCESS LEVEL = x
3. Press the 1 key on the numeric keypad to log in, so that the passcode prompt comes up.
Enter a Passcode followed by <ENTER>
4. Enter the passcode and press the Enter button. ACCESS GRANTED displays briefly on the LCD, and then the display goes back to:
1=Login 2=Logout
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