Chapter 7: Service and troubleshooting
202 EST3X Technical Reference Manual
from the loop controller, and then repeat the analysis. If during the first process
no devices restored, open the loop at a location electrically closer to the loop
controller, and then repeat the analysis.
Continue increasing or decreasing the number of devices on the opened loop leg
until you isolate the device or wire segment causing the problem.
Distinguishing short circuits from off-hook conditions in telephone risers
If local regulations require the ability to distinguish between a short circuit and an
off-hook condition in a telephone riser, you must configure the circuit so that it
functions as a four-state telephone. Compatible riser selector modules and
telephone sets are listed below.
• SIGA-CC1 riser selector
• SIGA-CC1S riser selector
• SIGA-CC2 riser selector
• SIGA-MCCA riser selector
• SIGA-MCC1 riser selector
• SIGA-MCC1S riser selector
• Portable handset and receptacle (P/N 6830-3 and 6833-4) telephone module
• Remote telephone and wall box, Break Glass (P/N 6830-4 and 6831-1, or
6831-3) telephone module
• Remote telephone and wall box, Nonbreak Glass (P/N 6830-4 and 6831-2, or
6831-4) telephone module
Note: For instructions on configuring a four-state telephone, refer to the
installation sheet supplied with the SIGA input or output module.
Ground fault conditions
Ground fault conditions require selective isolation of portions of the data loop to
systematically narrow down the fault’s location. A loop with a ground fault
(approximately 10 kΩ or less to ground) causes the GND Fault LED on the
control panel user interface to indicate. The conditions can occur on the
Signature loop, the 24 VDC smoke power circuit, or the input circuits to 3-SDC1,
3-SSDC1, and 3-SDDC1 loop controllers. The general location of a ground fault
can be determined by viewing a Trouble Report (see “Status reports” on
page 51) or by indications and messages on the control panel user interface (see
Table 60).
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