Service and troubleshooting
8.78 EST3 Installation and Service Manual
Addressable Analog circuit capacitance problems are typically
caused by long wire runs, ground faults on the Addressable
Analog circuit, improper T-taps, or improper shielding.
If shielded wire is used, the shield must be treated as a third
conductor. It must be free of all ground faults and have
continuity throughout.
If the wire capacitance is too large for the
run length, the only remedies are to replace the wire with a cable
having a lower capacitance per foot or install additional
Addressable Analog modules, dividing the circuit into acceptable
lengths.
Ground faults
Eliminating ground faults on the Addressable Analog circuit
reduces the amount of capacitance on the Addressable Analog
wiring.
Verify the Addressable Analog circuit is free of ground faults.
Correcting addressable analog circuit wiring
problems
If the Addressable Analog circuit is wired with improper T-taps
or excessive capacitance, corrective measures include:
• Designing the Addressable Analog circuit properly and
re-pulling the wire
• Balancing the circuit. Balancing the circuit can help in some
cases but is not a substitute for proper wiring practice. If
circuit balancing is required, call Technical Services for
additional information.
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