To troubleshoot a ground fault on the NFS2-3030, first identify the specific fault location indicated on the panel display. The system distinguishes between internal panel faults, SLC loop faults, and digital audio port faults.
Check the display for GROUND FAULT, which indicates a fault within the panel or on the main, auxiliary, or DAL device power supply (Page 31, 34) [5].
If GROUND FAULT LOOP x is displayed, inspect the field wiring for the specific SLC loop number indicated (Page 34) [5].
For GROUND FAULT PORT x, check the wiring on the Digital Audio Port (DAP) A or B (Page 31, 34) [5].
If the system is networked via High-Speed NOTI-FIRE-NET, verify that the HS-NCM ground fault detection switch (SW4) is enabled on only one side of each point-to-point connection (Page 12) [4].
Ensure the power supply (such as an AMPS-24) is correctly configured for ground fault detection and that all wiring is isolated from the conduit (Page 12) [4].
