The Johnson Controls M500XJ Fault Isolator Module is used with the IFC Intelligent Fire Alarm Control Panels (FACP) to protect the system against wire-to-wire short circuits on the SLC loops.
•Powered by SLC loop directly, no external power required.
•Mount in standard 4.0" (10.16 cm) square (2.125" [5.398 cm] deep) junction boxes.
•Integral LED blinks to indicate normal condition. Illuminates steady when short circuit condition is detected.
•High noise (EMF/RFI) immunity.
•Wide viewing angle of LED.
•SEMS screws with clamping plates for ease of wiring.
•Opens SLC loop automatically on detection of short, preventing the short from causing failure of the entire loop.
•Automatically resets on correction of short.
•Supports Style 4, 6, or 7 wiring.
The Fault Isolator Modules should be spaced between groups of sensors in a loop to protect the rest of the loop. Use to isolate short circuit problems within a section of a loop so that other sections can continue to operate normally. The M500XJ supports a maximum of 25 devices in-between isolators, except when using relay bases.
NOTE: ON LOADS PER RELAY BASE AND ISOLATORS/ISOLATOR BASES: the maximum number of addressable devices between isolators (or B224BI isolator bases) is 25 devices.
B224RB relay bases draw more current than all other intelligent devices. When calculating the 25-device maximum: B224RB represents 2.5 devices (see example on page 2)
NOTE: ON MAXIMUM NUMBER OF DEVICES: See the SLC Manual (p/n 51870) for information on loss of addresses due to current limitations. Each module or base added reduces the capacity of address positions in an SLC. Requirements differ as applied to relay bases (see note above).