____________________________________________________________________________________
3
3.2. Distribution of current from each bus is
provided by GMT style fuses. Each bus has 10
fuse holders for distribution, the fuses are
labeled 1 to 10 on each bus. Each fuse position
is made available at the rear of the fuse panel.
Maximum fuse size allowed in each position is
at 20 Amps; provided the maximum bus current
or BDFB fuse is not exceeded (each bus is
rated at 100Amps max).
3.3. Alarm circuitry provides 1 set of form “C”
contacts (C, NO and NC) for each bus (Bus A,
and Bus B). In the event of a fuse alarm, the
proper relay will change states, providing a
connection between the Normally Open “NO”
and Common “C” terminals for that bus. The
normally closed “NC” terminal will open to high
impedance.
4. INSTALLATION
Please read completely before beginning.
WARNING: Installation should only be performed
by an experienced Installer familiar with DC power
distribution systems.
This product must be installed within a
RESTRICTED ACCESS LOCATION where
access is through the use of a tool, lock and
key, or other means of security, and is
controlled by the authority responsible for
the location. This product must be installed
and maintained by TRAINED SERVICE
PERSONNEL ONLY.
4.1. Unpack and inspect the Westell Fuse Panel
for possible damage incurred during shipping. If
damage is found, file a claim immediately with the
carrier, and notify the Westell Customer Service
Department.
4.2. Mount the panel on the equipment rack using
the thread forming #12-24 rack mounting screws
and tooth lock washers provided.
WARNING: For safety reasons all wiring should
be done with the power source removed (when
possible).
Rack Mount Instructions:
Elevated Operating Ambient - For closed or
multi-unit rack assemblies, the operating ambient
may be greater than room ambient. Take care to
install the equipment in an environment
compatible with the maximum ambient
temperature (Tma) specified by the manufacturer.
Reduced air flow - Installation of the equipment
in a rack should be such that the amount of air
flow required for safe operation is not
compromised.
Mechanical Loading - Mounting of the equipment
in the rack should be such that a hazardous
condition is not achieved due to uneven
mechanical loading.
Circuit Overloading - Consideration should be
given to the connection of the equipment to the
supply circuit and the effect that overloading of
the circuits might have on overcurrent protection
and supply wiring. Appropriate consideration of
equipment nameplate ratings should be used
when addressing this concern.
Reliable earthing - Reliable earthing of rack-
mounted equipment should be maintained.
Particular attention should be given to supply
connections other than direct connections to the
branch circuit.
Note: A readily accessible disconnect device shall
be incorporated external to this equipment.
4.3. Remove the distribution fuse feeding the
input cables that are to be connected to the new
panel. Attach the input cables to the input
terminal block in accordance to the National
Electrical Code, ANSI/NFPA, and Canadian
Electrical code. Hook up the input cables to the
input terminal block on the fuse panel (“BAT” &
“RTN” for each bus). Each high current input
terminal uses a two hole compression lug (1/4” on
5/8”, torque to 5.5 ft-lbs). A two hole lug must be
used for proper operation (see fig 4.4.1)
