August 2013 1-20 P/N 06-236530-001
1-7.7 Electrical Supervision
• A short circuit from any field-wiring terminal (except AC-Power-Input Terminals and
Form-C Relay Terminals) to earth ground will create a “Ground-Fault” trouble
condition.
• An open circuit in the wiring for the SLC, the outputs (NACs, release circuits, and
combination circuits), the RS-485 communications circuit, and the battery-charging
circuit will create an “Open” trouble condition.
• A short circuit between conductors in the wiring for the SLC, the outputs (NACs,
release circuits, and combination circuits), the RS-485 communications circuit, and
the battery-charging circuit will create a “Short” trouble condition.
Exception: Release circuits and combination circuits wired as non-power-limited.
• Impedance values for open-circuit and short-circuit conditions are:
– open circuit: infinite ohms
– short circuit: zero (0) ohms
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