Honeywell NOTIFIER ISO-X Quick Start Manual

ISO-X
Fault Isolator Module
General
The Notifier ISO-X Fault Isolator Module is used with the NFS-
3030, NFS2-3030, NFS-640, NFS2-640, NFS-320, and AFP-
200 to protect the system against wire-to-wire short circuits on
the SLC loops.
Features
• 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, pre-
venting 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 iso-
late short circuit problems within a section of a loop so that
other sections can continue to operate normally. The ISO-X
supports a maximum of 25 devices in-between isolators,
except when using relay bases or IPX multisensors.
NOTE: ON LOADS PER RELAY BASE AND MULTI-SENSOR
DETECTORS/ISOLATORS/ISOLATOR BASES: the maximum
number of addressable devices between isolators (or B224BI iso-
lator bases) is 25 devices.
g2243dia1.wmf
B224RB relay bases and IPX-751 multisensor detectors draw
more current than all other intelligent devices. When calculat-
ing the 25-device maximum:B224RB
• B224RB represents 2.5 devices .
• IPX-751 in a standard base represents 12 devices .
• IPX-751 in a relay base represents 14.5 devices .
• All other addressable devices represent 1 device .
See examples on page 2.
NOTE: ON MAXIMUM NUMBER OF DEVICES: See the SLC
Manual (p/n 51253) for information on loss of addresses due to
current limitations. Each module or base added reduces the
capacity of address positions in an SLC. All SLC field devices must
Intelligent/Addressable Devices
ISO-X
have been purchased after February 1995 to meet the aforemen-
tioned requirements. If the SLC field devices were purchased prior
to February 1995, each ISO-X used reduces the capacity of an
SLC by two address positions. Requirements differ as applied to
relay bases (see note above).
Construction
The face plate is made of off-white plastic. Includes yellow
LED indicator that pulses when normal and illuminates steady
when a short is detected.
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 immedi-
ately switch to an open circuit state and isolate the groups of
sensors between them. The remaining units on the loop con-
tinue to fully operate.
In Style 4 loops, the ISO-X 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 Fault Isolator Module automatically restores the
shorted portion of the communications loop to normal condi-
tion when the short circuit condition is removed.
Installation
• Mount on a standard 4" (10.16 cm) mounting junction box
which is at least 2.125" (5.398 cm) deep.
• Terminal screws are provided for "in and out" wiring.
• Installation instructions are provided with each module.
dn-2243:A1 • H-300
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