____________________________________________________________________________________
4
Note:
The supply source must be limited to an
instantaneous short-circuit current not to exceed
450 Amps.
BAT
RTN
BUS B
9
10
BAT
RTN
Figure 4.4.1
4.4. The battery outputs (“BAT”) are available at
the terminal blocks (#6 screw torque to 9 in-lbs,
up to 10awg fork) at the rear of the panel. Each
fuse position is numbered and that circuit is
available at the terminal block position with the
same number.
4.5. All battery return (“RTN”) connections are
also terminated on barrier strips (#6 screw, up
to 10awg fork). Note that these returns are
isolated from the chassis frame.
4.6. This panel has Bus A, and Bus B alarms.
Each alarm has a common (C), normally open
(NO) and normally closed (NC) alarm contact.
In an alarm the “C” contact will short to the “NO”
contact and the “NC” will open. You can extend
the alarm connections as per your alarm system
requirements. Westell recommends you fuse
the alarm battery supply (ABS) to 1A or less to
protect the alarm wiring and circuitry.
4.7.
CHASSIS GROUND;
For safety reasons,
and as recommended by NEBS, the chassis
should be electrically connected to the rack
ground. From step 4.2. the panel should
already be ground to the rack via the #12-24
thread forming rack screws and outside tooth
lock washers. In addition to grounding via the
mounting brackets, an appropriate cable size as
outlined in section 5 (typically 10awg or larger)
and the ¼” bolt and locks on rear of chassis
(1/4” bolt torque;5.5ft-lbs or 7.5Nm) should also
be used. Consult the National Electric Code,
ANSI/NFPA, and Canadian Electrical code for
AWG sizes.
4.8. Power up the panel by installing a Listed
fuse/breaker rated for at least 60Vdc, with a trip
rating of 125 Amps Max.
The panel should
power up with the Normal Operation LED
9
illuminated and without any red LEDs
!
illuminated, and the relays should be in the
“Normal” state (“C” connected to “NC”).
4.9. If you wish to verify the fuse alarm circuit,
you can insert a blown fuse into one of the
empty fuse holders. The red Fuse Alarm
LED
!
should light and the Normal
Operation LED
9
should extinguish and the
appropriate alarm extension relay should
change states to extend the alarm.
4.10. Install panel output distribution fuses as
required. Be sure to size fuses to operate at no
more than 70% of their rating (14A max for a
20A fuse). Use the provided designation card to
keep a record of which equipment is connected
to which circuit and what the fuse rating is. Be
careful not to overload the panel bus or BDFB
fuse position rating supplying the panel.
