A ground fault on the MS-9600 is indicated by a steady yellow GROUND FAULT LED and a pulsing piezo sounder, signifying zero impedance between the FACP and earth ground (Page 128) [1].
To troubleshoot the fault, check the LCD for a "TROUBL" message and use the Read Status menu to identify if the fault is associated with a specific point or circuit (Page 113, 123) [1].
Follow these steps to isolate the fault:
Verify that the solid earth ground wire is properly attached to the grounding stud on the backbox (Page 24) [1].
If using shielded wiring for the SLC or UDACT-F, ensure the shield is connected at one end only to prevent ground loops (Page 151) [1].
Systematically disconnect field wiring circuits-including SLC loops, NACs, and DC power outputs-one at a time until the ground fault clear to identify the faulty run (Page 10) [1].
For IPDACT installations, confirm the IPDACT box ground is connected to the same ground point as the panel (Page 159) [1].
Inspect the identified circuit for pinched wires, moisture in junction boxes, or devices touching grounded surfaces.
