EST EST3X - Using the SDU Analog Addressable Diagnostic Tools

Chapter 7: Service and troubleshooting
226 EST3X Technical Reference Manual
additional analog addressable modules, dividing the loop into acceptable
lengths.
3. Ground faults: Eliminating ground faults on the analog addressable circuit
reduces the amount of capacitance on the wiring. You should check the loop
to ensure it is free from ground faults.
Correcting analog addressable loop wiring problems
If the analog addressable loop is wired with improper T-taps or excessive
capacitance, use the following corrective measures.
• Redesign the analog addressable loop correctly and re-pull the wire
• Balance the loop. Balancing the loop can help in some cases but is not a
substitute for proper wiring practice. If loop balancing is required, call
Technical Support for additional information.
Using the SDU Analog Addressable
diagnostic tools
The System Definition Utility contains an analog addressable diagnostics tool
that is used to assist the installing technician in isolating and correcting faults
with analog addressable loops, detectors, and modules.
Note: Pressing F1 at any time in the 3-SDU application opens the Help topic for
the page that you are currently viewing.
To access the Analog Addressable Status / Diagnostics tool:
1. Connect the computer running the SDU application to the panel that has the
analog addressable loop controller in trouble.
2. See “Using a TCP/IP connection to read from the panel” on page 70 and
configure the Remote Read Lock setting.
3. Open the 3-SDU project, click Tools on the menu bar, select Analog
Addressable, and then click Status / Diagnostics.
4. From the System Sensor Status / Diagnostics window, set the communication
criteria.
If using an RS-232 connection, the suggested baud rate is 19200.
5. From the Cabinet list, select the appropriate cabinet.
6. From the Loop Controller list, select the appropriate controller module.