What does 'SLC Open Fault' mean on the MS-9600 and how do I clear it?
An SLC Open Fault indicates a break in the Signaling Line Circuit wiring, preventing the panel from detecting continuity through the loop. This fault typically appears when the SLC is configured for NFPA Style 6 or 7 (redundant loop) and a wire is broken or disconnected [1].
To clear the fault:
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Inspect the SLC terminal block (TB8) on the main circuit board or SLC-2 expander for loose or disconnected wires (Page 3, 42) [1].
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Trace the field wiring to locate physical breaks, open junction boxes, or devices removed from their bases.
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Ensure the wiring configuration matches the programmed NFPA Style (4, 6, or 7) (Page 2) [1].
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Verify the loop resistance does not exceed 40 ohms (Page 3) [1].
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Once the physical continuity is restored, the panel will automatically record a "clear trouble" message; use the System Reset key to clear the display (Page 130) [1].