Alpha DCX LP User manual

DCX LP™
Low Prole DC Battery Disconnect System
For Unigy® II 6AVR125-33 NEBS
Technical Manual
Effective: March 2021

2C048-720-30 Rev. B (03/2021)
The following sections contain important safety information that must be followed during the installation of the equipment.
Read all of the instructions before installing or operating the equipment, and save this manual for future reference.
There may be multiple warnings associated with the call out. Example:
ATTENTION provides specic regulatory/code requirements that may a󰀨ect the placement of equipment and /or
installation procedures.
ATTENTION:
NOTICE provides additional information to help complete a specic task or procedure.
NOTICE:
ELECTRICAL HAZARD WARNING provides electrical safety information to PREVENT INJURY OR DEATH
to the technician or user.
WARNING! ELECTRICAL HAZARD
FUMES HAZARD WARNING provides fumes safety information to PREVENT INJURY OR DEATH to the
technician or user.
WARNING! FUMES HAZARD
FIRE HAZARD WARNING provides ammability safety information to PREVENT INJURY OR DEATH to the
technician or user.
WARNING! FIRE HAZARD
This WARNING provides safety information for both Electrical AND Fire Hazards
WARNING! ELECTRICAL & FIRE HAZARD
CAUTION provides safety information intended to PREVENT DAMAGE to material or equipment.
CAUTION!
GENERAL HAZARD WARNING provides safety information to PREVENT INJURY OR DEATH to the
technician or user.
WARNING! GENERAL HAZARD
Safety Notes
Alpha Technologies Services, Inc. considers customer safety and satisfaction its most important priority. To reduce the
risk of injury or death and to ensure continual safe operation of this product, certain information is presented di󰀨erently in
this manual. Alpha®tries to adhere to ANSI Z535 and encourages special attention and care to information presented in
the following manner:

3C048-720-30 Rev. B (03/2021)
DCX LP™
Low Prole DC Battery Disconnect System
For Unigy® II 6AVR125-33 NEBS
Technical Manual
C048-720-30 Rev. B
E󰀨ective: March 2021
© 2021 by Alpha Technologies Services, Inc.
Disclaimer
Images contained in this manual are for illustrative purposes only. These images may not match your installation.
Operator is cautioned to review the drawings and illustrations contained in this manual before proceeding. If there are
questions regarding the safe operation of this powering system, please contact Alpha Technologies Services, Inc. or your
nearest Alpha representative.
Alpha® shall not be held liable for any damage or injury involving its enclosures, power supplies, generators, batteries or
other hardware if used or operated in any manner or subject to any condition not consistent with its intended purpose or is
installed or operated in an unapproved manner or improperly maintained.
Contact Information
Sales information and customer service in USA
(7AM to 5PM, Pacic Time): 1 800 322 5742
Complete Technical Support in USA
(7AM to 5PM, Pacic Time or 24/7 emergency support): 1 800 863 3364
Sales information and Technical Support in Canada: 1 888 462 7487
Website: www.alpha.com

4C048-720-30 Rev. B (03/2021)
Contents
1.0 Purpose and Applicability � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
1�1 Product Model � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2.0 Theory of Operation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2�1 Introduction� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2�2 Features � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2�3 Circuit Breaker Trip Ratings � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2.4 Conguration Options� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
2.5 Monitoring Options � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
3.0 Unpacking and Inspection � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
3�1 Package Contents � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
4.0 Installation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1 Installation Preparation� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4.1.1 Elevated Operating Ambient Temperature � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4.1.2 Reduced Air Flow� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1�3 Mechanical Loading� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4.1.4 Circuit Overloading � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4.1.5 Reliable Earthing � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�1�6 Disconnect Device � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
4�2 Mounting Procedure � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
4.3 Termination Bus Plates� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
4�4 Chassis Ground � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
4.5 Emergency Power O󰀨 Option � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
4.6 Alarm Contacts � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
4�7 Electrical Test � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
4.8 Output Cable Installation � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 11
4�9 Installation Checklist� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 11
5.0 Product Specications � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �12
6.0 Models and Accessories � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �12
Appendix A: Mechanical Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
A.1 DCX LP™ Battery Disconnect System and East Penn Batteries Unigy® II 6AVR125-33 NEBS Battery
Stack with Front and Side Dimensions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 13

5C048-720-30 Rev. B (03/2021)
1.01.0 Purpose and ApplicabilityPurpose and Applicability
The purpose of this document is to detail the installation and operation instructions for the DCX LP™ battery disconnect
system.
1.11.1 Product ModelProduct Model
This DCX LP model is designed to t the East Penn Manufacturing Unigy® II 6AVR125-33 NEBS battery stack congured
for top right termination. This document applies to the following congurations of the DCX LP battery disconnect system:
Table 1. DCX LP Model Congurations
PART NUMBER DESCRIPTION
C016-1540-10 DCX LP; 1200A Breaker; Low Prole DC Battery Disconnect System for Unigy II 6AVR125-33 NEBS
C016-1545-10 DCX LP; 1200A Breaker; Low Prole DC Battery Disconnect System for Unigy II 6AVR125-33
NEBS; Switch Version
2.02.0 Theory of OperationTheory of Operation
2.12.1 IntroductionIntroduction
The DCX LP battery disconnect system includes multiple amperage ratings and installation mounting schemes to provide
a DC or battery source disconnect device for use in telecom +24 or –48VDC systems as well as solar-alternate energy
or other DC applications. The primary application for the DCX LP system is to provide over-current protection for battery
sourced equipment and wiring. The secondary function is to provide a service disconnect in order to maintain batteries
or to shut down the battery source connection in an emergency. The DCX LP system features a low prole design to
maximize installation exibility in space constrained applications.
2.22.2 FeaturesFeatures
yTop rack mounting conguration with multiple cable routing options
yInput voltage: -40V to -60VDC
ySwitch in series with negative conductor
yForm C relay contact output for remote monitoring
yLED indicators for on-line/o󰀨-line status, EPO trip and general fault alarm status
yInternal 1200A/50mV metering shunt, terminal block for alarm/wiring connections and GMT fuse for EPO circuit
yEPO enable/disable switch
yBattery positive input terminal, chassis ground two-hole lug attachment
y-40 to -60VDC input voltage
2.32.3 Circuit Breaker Trip RatingsCircuit Breaker Trip Ratings
y1200A
2.42.4 Conguration OptionsConguration Options
The DCX LP unit is available in a top mount conguration
supporting several cable exit options:
yAll left, all right, left + right, top, rear
Figure 1. Cable conguration options

6C048-720-30 Rev. B (03/2021)
2.52.5 Monitoring OptionsMonitoring Options
The DCX LP unit also includes monitoring features for local and remote
status indication:
yBasic control panel version: LED indicators “ON-LINE”, “OFF-
LINE”, “OPTION STATUS”, “EPO TRIPPED”. Alarm contacts:
Form-C relay contacts to provide breaker trip status. See Figure 2.
yON-LINE: The battery string is connected – circuit breaker/
switch is ON.
yOFF-LINE: The battery string is disconnected – circuit breaker/
switch is OFF.
yOPTION STATUS – provides information for any installed option, such as the TRD VRLA Battery Thermal
Runaway Detection System
NO LI GHT: No option is installed
GREEN LIGHT: Option is installed and working normally
RED LIGHT: Option is in alarm (for more information, refer to the installed option's manual)
yEPO TRIPPED – Emergency Power O󰀨 input is active. This indicator is not persistent.
Figure 2. LED indicators
Figure 3. DCX LP unit
Figure 4. Mounting hardware kit
Figure 5. Electrical connection kit
3.13.1 Package ContentsPackage Contents
Included with your product are the following items:
yDCX LP unit (see Figure 3).
yMounting hardware kit with necessary screws and
washers (see Figure 4).
1 Left side rail
1 Right side rail
2 Bottom rail
4 1/2-13 x 2 1/2" hex-head screw
4 1/4-20 x 5/8" hex-head screw
4 1/4" split washer
4 1/4" at washer
yElectrical connection kit with necessary screws and
washers (see Figure 5).
1 3' Grounding cable - 1/4" holes, 1" center-to-center
2 Tie strap
12 3/8-16 x 1" hex-head screw
6 3/8-16 x 1" socket cap screw
4 6-32 x 3/8" Phillips® pan-head screw
18 3/8" at washer
18 3/8" split washer
6 1/4-20 x 1 3/4" partial thread hex-head screw
12 1/4" Flat washer
6 1/2" Split lock washer
6 1/4-20 Hex nut
5 Screw nishing cap
2 Plastic termination plate shields
yTermination bus plates with assembled isolators
yThermal Runaway Detection (TRD) kit
3.03.0 Unpacking and InspectionUnpacking and Inspection
The DCX LP unit was carefully packaged at the factory to withstand the normal rigors of shipping. However, you should
carefully inspect the box and contents to conrm that no damage has occurred in transit. Most shipping carriers require
notication of shipping damage within twenty-four hours of delivery, and it is the responsibility of the recipient to inspect
the shipment immediately upon receipt. Remove the DCX LP unit and related hardware. Refer to Section 3.1 to conrm
that all parts are present for installation�

7C048-720-30 Rev. B (03/2021)
4.04.0 InstallationInstallation
FOR SAFETY PURPOSES, PRIOR TO THE INSTALLATION OF THE DCX LP UNIT, DISCONNECT
SEVERAL SERIES BUS CONNECTIONS OF THE STRING TO ENSURE THE TOP NEGATIVE
TERMINAL IS NOT CONNECTED IN SERIES TO THE REST OF THE STRING. THIS IS CRITICAL FOR
INSTALLATION WORK TO BE DONE SAFELY WITHOUT VOLTAGE PRESENT. ENSURE THAT ALL
THE PLASTIC CELL TERMINAL COVERS ARE INSTALLED TO PREVENT ACCIDENTAL CONTACT
OR SHORT CIRCUIT OF THE STRING TERMINALS WITH TOOLS ETC. DURING THIS INSTALLATION
PROCESS.
CAUTION!
4.14.1 Installation PreparationInstallation Preparation
When selecting an installation location, ensure that all of the following conditions are met before proceeding.
4.1.14.1.1 Elevated Operating Ambient TemperatureElevated Operating Ambient Temperature
If you install the panel in a closed or multi-unit rack assembly, the operating ambient temperature of the rack environment
may be greater than room ambient. Therefore, take care to install the equipment in an environment compatible with the
maximum ambient temperature (TMA).
4.1.24.1.2 Reduced Air FlowReduced Air Flow
Installation of the equipment in a rack should be such that the amount of air ow required for safe operation of the
equipment is not compromised.
4.1.34.1.3 Mechanical LoadingMechanical Loading
Mounting of the equipment in the rack should be such that a hazardous condition is not achieved due to uneven
mechanical loading.
4.1.44.1.4 Circuit OverloadingCircuit Overloading
Give consideration to the connection of the equipment to the supply circuit and the e󰀨ect that overloading of the circuits
might have on overcurrent protection and supply wiring. Use appropriate consideration for equipment nameplate ratings
when addressing this concern.
4.1.54.1.5 Reliable EarthingReliable Earthing
Maintain reliable earthing of rack-mounted equipment. Pay particular attention to supply connections other than direct
connections to the branch circuit (e.g., use of power strips).
4.1.64.1.6 Disconnect DeviceDisconnect Device
A readily accessible disconnect device must be incorporated in the building installation wiring.

8C048-720-30 Rev. B (03/2021)
4.24.2 Mounting ProcedureMounting Procedure
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 ONLY BY QUALIFIED TECHNICIANS.
NOTICE:
NOTE: The mounting location and terminal plate are congured
for the –48VDC output terminals to be located on the center
top battery of the 8 shelf battery stack.
Ensure that the battery stack is congured for the negative 48V
output to be the center top battery for direct bolted connection to the
input of the DCX LP unit.
Step 1. Locate the mounting hardware kit for the DCX LP unit. Begin
by fastening the side rails onto the top of the stack using (4)
1/2-13 x 2 1/2" screws.
Step 2. Fit the bottom rails in between the side rails using the slots
provided by the side rails. The bottom rails are for support
and will not need fastening (see Figure 6)�
DUE TO ITS SIZE AND WEIGHT, THE DCX LP UNIT
SHOULD NOT BE LIFTED OR MOUNTED BY FEWER
THAN TWO PEOPLE TO AVOID SERIOUS INJURY AS
WELL AS PREVENT DAMAGE TO THE UNIT.
CAUTION!
Step 3. NOTE: Make sure the breaker handle of the DCX LP unit is
in the "OFF" position prior to installation. The breaker switch
is located underneath the front panel of the DCX LP unit.
Carefully lift the DCX LP unit to the top of the battery stack
over the assembled mounting kit. Be sure to align the screw
holes on the unit with those on the side mounting rails (see
Figure 7)�
Step 4. Secure the DCX LP unit to the side rails using (4) 1/4-20 x
5/8" hex screws and washers located in the mounting kit. A
split washer should separate the screw head and at washer.
Two hex screws should be used to mount the left and right
sides of the DCX LP unit.
Step 5. Lift the front cover of the DCX LP unit and remove the plastic
termination bus covers from the unit using a Phillips®
screwdriver (see Figure 8)�
Figure 6. Assembled mounting kit
for DCX LP Unit
Figure 7. DCX LP unit mounting alignment
Figure 8. Plastic termination bus covers

9C048-720-30 Rev. B (03/2021)
4.34.3 Termination Bus PlatesTermination Bus Plates
NOTE: Before installing the termination bus plates, ensure
that any bolts located above the top center and top right
batteries are shielded using the screw nishing caps. See
Figure 6 on page 8 and note the ve nishing caps over the screws
at the top of the stack�
Step 1. Locate the two termination bus plates. The plates are pre-
assembled with input bus isolators (see Figure 9)� Check to
ensure the isolators are secure around the plates. Tightly
secure the termination bus plates onto the -48V and +48V
input bus bars using (2) 3/8 16 x 1" socket cap screws with
split and at washers.
Step 2. Insert (6) 1/4-20 x 1 3/4" hex screws with at washer
through the top of the battery termination plate and through
the cell terminals. Next, secure the tie straps as shown
using a at washer, split washer, and 1/4-20 hex nut (see
Figure 10)�
Step 3. After adjustment, tighten all bolts securely. All split lock
washers should be engaged and compressed. Use a
torque wrench to tighten the terminal plate to the negative
terminal posts. Consult the battery manufacturer torque
specication but typically 100 in·lbs is used.
Step 4. Replace the plastic termination bus covers using the
hardware that they came assembled to the DCX LP unit
with.
Step 5. Fix the plastic termination plate shields over the termination
plates using the 6-32 x 3/8 pan head screws. The shields
are to be attached to the isolation bars surrounding the
termination plates.
Step 6. Ensure that the DCX LP unit is securely mounted on the
top of the battery stack.
Step 7. Once mechanical mounting is complete, the remaining
steps include electrical connections�
4.44.4 Chassis GroundChassis Ground
Table 2. Ground Termination Summary
TERMINATION
TYPE
HOLE/
STUD SIZE
CENTER TO
CENTER
RECOMMENDED
TORQUE VALUE
Threaded Stud 1/4 in. 1 in� 5.83 ft·lbs
Step 1. Attach grounding cable to chassis via the internal protective
ground studs inside the DCX LP unit (see Figure 11)�
Figure 9. Termination bus plate with isolators
Figure 10. Fastened tie straps
Figure 11. Grounding cable connection

10 C048-720-30 Rev. B (03/2021)
4.54.5 Emergency Power O󰀨 Option Emergency Power O󰀨 Option
The DCX LP unit is equipped with a terminal block input
connection for a remote emergency power o󰀨 (EPO) switch (see
Figure 12). External dry contact switch closure is required.
An external wall mount mushroom head switch is commonly
used for EPO functions. Route the two conductors from the
switch to the DCX LP unit terminal block positions labeled “EPO
SW COM” and “EPO SW N/O”. The DCX LP unit is shipped with
the EPO switch function disabled via a slide switch located on
the circuit board. Slide this switch to the “enabled” position if the
EPO function is desired. Figure 12. EPO Switch
DO NOT WIRE THE EPO INPUT IN COMMON WITH ANY OTHER ELECTRICAL DEVICE OR APPLY
A VOLTAGE ON THIS INPUT FROM ANY OTHER SOURCE OR DAMAGE WILL OCCUR THAT IS NOT
COVERED BY THE WARRANTY. ONLY CONNECT A DEDICATED EXTERNAL DRY CONTACT CLOSURE
NORMALLY OPEN SWITCH TO THIS CIRCUIT.
CAUTION!
4.64.6 Alarm ContactsAlarm Contacts
Step 1. The DCX LP unit comes with an alarm relay with contacts routed to the terminal block on the circuit board
assembly. The alarm contacts are rated 0.5A. Remote alarm sensing can be connected to the alarm contacts to
provide an alarm when the DCX LP units circuit breaker is o󰀨-line or there is an alarm condition.
The alarm relay contacts can be congured to monitor a "Normally Open" or "Normally Closed" state. The unit
ships congured to the "Normally Open" condition. The desired conguration can be selected using jumper "J8"
on the DCX LP unit termination board.
Step 2. Route the alarm wires securely via either of the two grommets on the right side of the assembly.
4.74.7 Electrical TestElectrical Test
Perform an electrical test prior to output cable installation.
Step 1. Flip the DCX LP breaker to the "OFF" position. Ensure that the battery positive termination plate is installed and
routed securely, and that the EPO switch and alarm contact wires are installed and secured (if used)�
Step 2. Ensure that the remote EPO switch is in the o󰀨 position (if used). Connect the battery string cell connection bus
bars that were left disconnected for safety purposes during the DCX LP unit installation. Upon connection of the
series string, the DCX LP “OFF-LINE” LED will light up.
Step 3. Check voltage on the battery termination plate relative to battery positive and ensure that approximately 54 VDC
is measured. Ensure there are no cables connected to the DCX LP output bus bar and that the clear plastic
covers are installed
Step 4. Flip on the DCX LP breaker. The “ON-LINE” blue LED should light and the unit should be functional.
Step 5. To test the EPO trip, push in the remote EPO switch; the DCX LP breaker should trip to the o󰀨 position and the
ON-LINE LED will go out and the OFF-LINE LED will turn on.
Step 6. The EPO TRIPPED LED will also turn on and will stay on as long as the remote EPO switch is closed.
Step 7. Reset the remote EPO switch to o󰀨, reset the DCX LP breaker to "ON". Observe correct LED indication of "ON-
LINE".
Step 8. The alarm contacts can be tested with an ohmmeter if desired by ipping the DCX LP breaker handle o󰀨 and on
and observing the alarm contacts opening and closing with the ohmmeter. This completes the electrical test.
Step 9. Turn o󰀨 the DCX LP breaker.