The Notifier ISO-X(A) Fault Isolator Module is used with Notifier
Onyx and CLIP series Fire Alarm Control Panels (FACPs)
to protect the system against wire-to-wire short circuits on the
SLC loops.
Features
• Powered by SLC loop directly, no external power required.
• Base mounts on standard junction boxes (4.0"/10.16 cm square by 2.125"/5.398 cm deep).
• 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.
Applications
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 ISO-X(A)
supports a maximum of 25 devices in-between isolators,
except when using relay bases or legacy IPX multisensors.
NOTE: ON LOADS PER RELAY BASE AND LEGACY MULTISENSOR
DETECTORS/ISOLATORS/ISOLATOR BASES: the
maximum number of addressable devices between isolators (or
B224BI isolator bases) is 25 devices.
Operation
Automatically opens circuit when the line voltage drops below four volts. Fault Isolator Modules should be spaced between groups of addressable devices (maximum 25, see notes on page 1) in a loop to protect the rest of the loop. If a short occurs between any two isolators, then both isolators immediately
switch to an open circuit state and isolate the groups of sensors between them. The remaining units on the loop continue to fully operate.
In Style 4 loops, the ISO-X(A) is generally used at each T-tap branch, to limit the effect of short circuits on a branch to the devices on that branch. The LED indicator is on continuously during a short circuit condition.
The ISO-X(A) Fault Isolator Module automatically restores the shorted portion of the communications loop to normal condition when the short circuit condition is removed.