Westell A90-DCP10X10 User manual

Westell A90-DCP10X10 High Current Universal Fuse and
Breaker Panel
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Page 1 of 6
Section A90-DCP10X10
Equipment Issue A
030-101868 Rev A, September 2015
1509IARA
CONTENTS PAGE #s
FEATURES.........................................................................1
1. GENERAL DESCRIPTION............................................1-2
2. APPLICATION...............................................................2
3. CIRCUIT DESCRIPTION...............................................2
4. INSTALLATION.............................................................2-4
5. SPECIFICATIONS.........................................................4
6. TECHNICAL SERVICES...............................................5
7. WARRANTY AND REPAIRS ........................................5
8. SCHEMATIC .................................................................6
FEATURES
Compatible with +24V, +48V, -24V or -48V dc input
voltages (battery voltages)
Pluggable panel accepts bullet Breakers, TFD
Fuseholders (TLS or TPS fuses), and TPC
Fuseholders
2 busses per panel (600 Amps/bus maximum)
125A max Fuse rating per position (100A load current)
Normal and Alarm LEDs for Bus A and Bus B indicate
power or fuse failure
Two sets of “Form C” relay contacts extend alarm
conditions for each bus
Replaceable alarm card
Brackets supplied for both 19” and 23” racks, with
flush and offset mounting options
High current 3/8” stud inputs (two sets of 3/8” studs
on 1” centers) for up to 600A/Input
High current 1/4” stud outputs (1/4”studs on 5/8”
centers) for up to 100Amps/Output
UL Safety Listed ANSI/UL 60950-1 and CAN/CSA
C22.2 No. 60950-1
Rear view

Section A90-DCP10X10 030-101868 Rev A
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1. GENERAL DESCRIPTION
1.1. The Westell A90-DCP10X10 Breaker and Fuse Panel
provides distribution of DC power to equipment. The panel has 2
buses, each bus consisting of 10 pluggable fuse or breaker
positions. Alarm circuits are provided to indicate and extend
alarm conditions when faults occur.
1.2. Input wiring is connected to high current, 2-hole lug input
terminals located at the rear of the panel. Each bus has its own
completely isolated inputs, allowing the distribution of two battery
voltages through the same panel.
1.3. The power is distributed to the load side equipment
through breakers, TLS, TPS or TPC style fuses. There are 10
positions per group and two groups per panel. Each position is
available for installer connection at the rear of the panel. A
designation card is provided for keeping records of which position
is connected to which equipment and what amperage is to be
used.
1.4. Alarm circuits are provided to alert service personnel of
fault conditions. A fuse alarm is generated when a fuse is blown
or a breaker has toggled into an alarm state. That is, a mid-trip
breaker alarms only in the tripped position and not in the off
position. However, a non mid-trip breaker will alarm when it is in
the off position. A red alarm LED
!
on the faceplate will
illuminate when a fuse or breaker alarm condition is present. As
well, the green Normal Operation LED will extinguish to signal
a fuse/breaker alarm or input power failure and the appropriate
relay contacts will change states. These fuse/breaker panels
have common (C), normally open (NO) and normally closed (NC)
terminals for alarms. Note: the use of the alarm contacts is
optional. If you do not wish to extend the alarms, you don’t have
to do anything with the alarm pins. The “Normal” condition of the
relay exists when the panel is powered up without any fuse or
breaker alarms. The local alarm LEDs are located on the front of
the panel as shown in Figure 1.4.1.
LED
SYMBOL
SIGNIFICANCE
GREEN

NORMAL
OPERATION
RED
!
BLOWN FUSE
or TRIPPED
BREAKER
8910
1098
!

!

BUS A
BUS B
Figure 1.4.1
1.5. The panels are shipped with universal brackets (1” & 1-
1/4” hole spacing) that will fit both 19" and 23" wide racks and use
three 1.75" panel spaces. The panel has two clear plastic shields
to protect the wiring connections on the back of the panel. When
cabling out the top of the panel, use the rear shield. When cabling
out of the back of the panel, use the top shield.
2. APPLICATION
2.1. The A90-DCP10X10 Power Distrirbution Panel is
designed to be used in the rack level distribution of DC power.
They are rack mount panels that provide DC power through two
busses; each bus has 10 positions.
2.2. The A90-DCP10X10 is suitable for installation as part of
a Common Bonding Network (CBN). As well, this product is
intended for restricted access locations in Network
Telecommunications Facilities and OSP.
3. CIRCUIT DESCRIPTION
3.1. Power is connected to the panel through 3/8” stud inputs
(see fig 4.4.1). There are two sets of input terminations for each
bus. These inputs are high current terminations for providing up
to 600A per bus. There is a Return (RTN) and Battery (BAT) input
for each bus.
3.2. Distribution of current from each bus is provided by
either breakers, TLS, TPS or TPC style fuses. Each bus has 10
pluggable positions. Each position is made available at the rear
of the panel via ¼” on 5/8” stud terminals.
3.3. Fuse/breaker 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 tripped breaker, blown fuse or loss of input power, 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 Panel for possible damage
incurred during shipping. If damage is found, file a claim
immediately with the carrier, and notify Customer Service.
4.2. Once thepanelisunpacked,verifythat therearetwo sets of
mounting brackets. One set is for 19” racks, and the other for 23”
racks. Thebracketswillfitboth1” and 1-1/4” hole spacing applications.
The brackets can be mounted so the panel can be installed for a flush
mounting or offset positions. Adjust the position and orientation of the
correctmountingbracketsonthefusepanel,suchthatitwillfittherack
you wish to mount the panel in.

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Figure 4.2.1
4.3. Mount the panel on the equipment rack using the thread
forming #12-24 rack mounting screws and tooth lock washers
provided. If you want the cables to exit the top of the panel, use
standard lugs and discard the top protective shield. If you want
the cabling to exit the back of the panel, use right angle lugs and
discard the back protective shield.
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.
WARNING: For safety reasons all wiring should be done with all
power sources removed (when possible).
Note: A readily accessible disconnect device shall be
incorporated in the building installation wiring.
4.4. Remove the distribution fuse feeding the input cables
that are to be connected to the new panel. Remove the 2 outer
nuts on each side and slide the return bar assembly off the unit
to access the input terminals. Attach the input cables to the input
terminals in accordance to the National Electrical Code,
ANSI/NFPA, and Canadian Electrical code. Hook up the input
cables to the input terminals (“BAT” & “RTN” for each bus). Each
high current input terminal can accept 2 - two-hole compression
lug (3/8” on 1”, torque to 20 ft-lbs). Once the inputs are
connected, re-install the ground bar assembly, and the 4 nuts that
hold it in place.
Figure 4.4.1
4.5. The battery outputs (BAT) and ground returns (RTN) are
also located on the back of the panel. Each fuse/breaker position
and terminal position is numbered 1-10. Connect your load side
equipment to the panel, and record which equipment is
connected to which input on the designation card (supplied).
4.6. All battery return (“RTN”) connections are also
terminated using two-hole lugs (1/4” on 5/8” centers). Note, these
returns are isolated from the chassis frame.
4.7. This panel has Bus A, and Bus B alarm contacts. 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. Wire-wrap the alarm
connections as per your alarm system requirements. The alarm
contacts are limited to 1A through an auto resettable fuse within
the panel. The panel comes preconfigured to work with fuse
alarms and mid-trip style breaker alarms. If you wish to use
standard non mid-trip breakers, adjust the shunt on the pluggable
alarm card to the “NON MID-TRIP” position.
4.8. Chassis Ground: For safety reasons, and as
recommended by NEBS, the chassis should be electrically
connected to the rack ground. From step 4.3. 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, it is recommended you ground the
chassis using a ground cable and the two ¼” bolts on the inner
sidewall of the chassis (1/4” bolt torque; 5.5ft-lbs or 7.5Nm).
Consult the National Electric Code, ANSI/NFPA, and Canadian
Electrical code for AWG sizes.
4.9. The input wiring feeding this panel should be protected
by a Listed fuse/breaker rated for at least 60Vdc, with a trip rating
of 750 Amps Max. With input wiring connected and this input fuse
installed, the panel should power up with the Normal Operation
LED illuminated and without any red LEDs
!
illuminated,
and the relays should be in the “Normal” state (“C” connected to
“NC”).

Section A90-DCP10X10 030-101868 Rev A
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4.10. If you wish to verify the fuse alarm circuit, you can insert
a blown fuse into one of the fuse positions. The red Fuse Alarm
LED
!
should light and the Normal Operation LED should
extinguish and the appropriate alarm extension relay should
change states to extend the alarm.
4.11. Install panel output distribution fuses or breakers as
required. Be sure to size these protection devices to no more
than 80% of their rating (100A max for a 125A fuse, 80A max for
a 100A breaker). Fuses and breakers are not included with this
panel. Fuse ratings should be selected to match the load
equipment ratings. Once the appropriate fuses have been
selected, the fuse information for 1-10 on BUS A and 1-10 on
BUS B is to be recorded at the time of installation. 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 BDB fuse position rating
supplying the panel.
5. SPECIFICATIONS
5.1. Voltage ±24 or ±48 VDC Typical
±22 to ±58 VDC Maximum
5.2. Breaker Size 0.1 to 100 Amps Max*
10,000 AIC, 80Vdc
(Sensata LML or LEL Series)
TFD Fuseholder 1-125A Max*
100,000 AIC, 170Vdc
(Littelfuse type TLS)
or
1-70A Max*
100,000 AIC, 170Vdc
(Telpower type TPS)
TPC Fuseholder 3-125A Max*
100,000 AIC, 80Vdc
(Telpower type TPC)
5.3. Current/Position 100 Amps Max**
5.4. Current/Bus 600 Amps Max**
Fuse at 750A Max
5.5. Current/Panel 1200 Amps Max
5.6 Output/Bus 10 Positions
5.7. Busses/Panel 2 Busses per Panel
5.8. Input Terminals Two sets of Two 3/8” Studs
on 1” centers
Up to a 777MCM DLO cable
Max lug width = 1.54”
5.9. Output Terminals Two ¼” studs on 5/8” centers
Up to a 1/0AWG, flex cable
Max lug width = 0.7”
5.10. Ground Terminal Two ¼” studs on 5/8” centers
Up to a 2/0AWG cable
Max lug width is 0.85”
5.11. Alarm Block 0.045” sq wire wrap pin
5.12. Relay Current 1 Amp/58Vdc max
5.13. Dimensions 5¼ H, 17 W,7 D
(excluding brackets)
5.14. Rack Mounting 19” and 23” Racks
1” and 1.25” hole spacing for
WECO and EIA style racks
5.15. Weight Approx 25 lbs
5.16. Operating Temp. -40 to +70C (ambient)
(-40 to +158F)
5.17. Color Off-white
5.18. Short Circuit 10,000A (Max)
Withstand Rating
*We recommend that you size breakers and fuses such that
they do not run at more than 80% of their rating. Thus a 125A
fuse should not be run at more than 100 A of continuous
current.
**The sum of the fuse/breaker currents must not exceed the
bus rating (600A) or the input fuse rating.
Compatible lugs for Input terminals
2 hole compression lugs for 3/8” studs on 1” centers (torque
20ft-lbs) example;
Panduit®
LCDXN750-38DF 777MCM, DLO, 90° lug
LCDXN750-38D 777MCM, DLO
LCD500-38D 500MCM, Code
LCDN500-38D 500MCM, Narrow tongue
LCD500-38DF 500MCM, 90° lug
LCDXN500-38D 500MCM, Flex, 90° lug
LCDX350-38D 350MCM, Flex
LCDXN350-38D 350MCM, Flex, Narrow
LCDX350-38DF 350MCM, Flex, 90° lug
The Panduit CT-930 (manual hydraulic) or CT2930 (lithium-
ion powered) crimping tools with the corresponding dies can
be used to crimp any of these lugs.
Compatible lugs for Output terminals
2 hole compression lugs for 1/4” studs on 5/8” centers
(torque 5.5ft-lbs) example;
Panduit®
LCD1-14A 1AWG, code
LCD1-14AF 1AWG, code, 90° lug
LCDX2-14A 2AWG, flex
LCDX2-14AF 2AWG, flex, 90° lug
LCDXN2-14A 2AWG, flex, narrow tongue
LCD2-14A 2AWG, code
LCD4-14A 4AWG, code
LCD6-14A 6AWG, code
LCD8-14A 8AWG, code
Burndy®
YAV25L2NT14FX 1/0AWG, flex, narrow tongue

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Ordering Options:
Part Number
Description and notes
A90-DCP10X10
Chassis, with filler plates only (mounting ears included; breakers, fuse holders, and fuses sold
separately)
BR-DCPXXX-M1BUL
Mid-trip breaker with toggle guard and bullet-style terminals (XXX is the amperage. Refer to
www.westell.com for available breakers.)
BR-DCPXXX-S1BUL
Non mid-trip breaker with toggle guard and bullet-style terminals (XXX is the amperage. Refer to
www.westell.com for available breakers.)
FF-DCPTFD-HLDR
TFD Style Fuse holder with extraction handles/ guards (holds TPS fuses up to 70A and TLS fuses
up to 125A. Refer to www.westell.com for available TPS or TLS fuses.)
FF-DCPTPC-HLDR
TPC Style Fuse holder with extraction handles/ guards (holds TPC fuses up to 125A. Refer to
www.westell.com for available TPC fuses.)
6. TECHNICAL SERVICES
6.1 If technical or customer assistance is required,
contact Westell by calling or using one of the following
options:
Voice: [phone]
email: [email protected]
For additional information about Westell, visit the Westell
World Wide Web site at http://www.Westell.com.
7. WARRANTY & REPAIRS
7.1 Westell warrants this product to be free of defects at the
time of shipment. Westell also warrants this product to be
fully functional for the time period specified by the terms and
conditions governing the sale of the product. Any attempt to
repair or modify the equipment by anyone other than an
authorized Westell representative will void the warranty.
7.2 Westell will repair or replace any defective Westell
equipment without cost during the warranty period if the unit
is defective for any reason other than abuse, improper use,
or improper installation. To return defective equipment, first
request a Return Material Authorization (RMA) number from
Westell by calling or using one of the options shown below.
Once an RMA number is obtained, return the defective unit
(freight prepaid), along with a brief problem description, to the
address we will provide to you when you contact us.
email: [email protected]
Replacements will be shipped in the fastest manner
consistent with the urgency of the situation. Westell will
continue to repair or replace faulty equipment beyond the
warranty period for a nominal charge. Contact Westell for
details.

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