Service and troubleshooting
EST3 Installation and Service Manual 8.39
number of devices on the opened circuit leg until you eventually
isolate the single device or wire segment that is 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 4-state
telephone. The table below lists compatible riser selector
modules and compatible telephone sets:
Table 8-27: Devices than can be used to configure a 4-state
telephone
Riser selectors Telephone modules
SIGA-CC1
SIGA-CC1S
SIGA-MCC1
SIGA-MCC1S
Portable handset and receptacle (P/N
6833–1 and 6830–3)
Remote telephone and wall box, Break
Glass Type (P/N 6831–1 and 6830–1)
Remote telephone and wall box, Nonbreak
Glass (P/N 6831–4 and 6830–1)
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 circuit to systematically narrow down the fault’s
location. A circuit with a ground fault (approximately 10 kΩ or
less to ground) will cause the LCD module to light the Ground
Fault LED. Ground fault conditions can occur on the data circuit,
the 24 Vdc smoke power circuit or the input circuits to Signature
series modules. The general location of a ground fault can be
determined using the LCD status command and Table 8-28
below.
Table 8-28: Ground fault indications
LCD Ground Fault Location
Ground Fault LED ON
No Device Trouble
1. Signature data circuit
2. 24 Vdc smoke power circuit
Ground Fault LED ON
Device PPCCDDDD Trouble
1. Positive leg of input circuit of
device PPCCDDDD
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