Vertiv NetSure 722NBBB Guide

NetSure™
-48V DC Bulk Output Power System
Installation and User Instructions (UM582127100), Revision E
Specification Number: 582127100
Model Number: 722NBBB

Vertiv |NetSure -48V DC Bulk Output Power System Installation and User Instructions (UM582127100)|Rev. E
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The information contained in this document is subject to change without
notice and may not be suitable for all applications. While every precaution
has been taken to ensure accuracy and completeness herein, Vertiv Group
Corp. assumes no responsibility, and disclaims all liability, for damages
resulting from use of this information or for any errors or omissions. Refer
to other local practices or building codes as applicable for the correct
methods, tools, and materials to be used in performing procedures not
specifically described in this document.
This document may contain confidential and/or proprietary information of
Vertiv Group Corp., and its receipt or possession does not convey any right
to reproduce, disclose its contents, or to manufacture or sell anything that
it may describe. Reproduction, disclosure, or use without specific
authorization from Vertiv Group Corp. is strictly prohibited.
Vertiv and the Vertiv logo are trademarks or registered trademarks of
Vertiv Group Corp. All other names and logos referred to are trade names,
trademarks or registered trademarks of their respective owners.
© 2019 Vertiv Group Corp. All rights reserved.

Vertiv |NetSure -48V DC Bulk Output Power System Installation and User Instructions (UM582127100)|Rev. E
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TABLE OF CONTENTS
Admonishments Used in this Document............................................................5
Important Safety Instructions ..............................................................................6
General Safety .......................................................................................................................................................... 6
Voltages.......................................................................................................................................................................... 6
AC Input Voltages........................................................................................................................................................6
DC Output and Battery Voltages ..................................................................................................................6
Battery ...............................................................................................................................................................................7
Personal Protective Equipment (PPE)............................................................................................. 8
Hazardous Voltage.............................................................................................................................................. 8
Handling Equipment Containing Static Sensitive Components............................. 8
Maintenance and Replacement Procedures.............................................................................. 8
Static Warning...........................................................................................................9
System Overview.....................................................................................................11
Customer Documentation Package...................................................................................................11
System Description ............................................................................................................................................11
Installation Acceptance Checklist..................................................................... 12
Installing the System............................................................................................. 13
General Requirements....................................................................................................................................13
Securing the Relay Rack to the Floor..............................................................................................14
Mounting System Components in a Relay Rack..................................................................14
Setting Switch Options........................................................................................ 22
Switch Settings on IB2 Interface Board........................................................................................ 22
Making Electrical Connections...........................................................................23
Important Safety Instructions ................................................................................................................ 23
Wiring Considerations.................................................................................................................................... 23
Relay Rack Grounding Connection (Frame Ground) ..................................................... 23
AC Input and AC Input Equipment Grounding Connections to
Rectifier Module Mounting Shelves.................................................................................................24
Connections to 588705000 List 51 and 61 (Single-Phase, Terminal
Blocks)..................................................................................................................................................................................24
Connections to 588705000 List 52 and 62 (Three-Phase, Terminal
Blocks).................................................................................................................................................................................. 27
Connections to 588705000 List 53 and 63 (Single-Phase, Line Cords).............29
External Alarm, Reference, Monitoring, and Control Connections ...................30
External Alarm, Reference, Monitoring, and Control Connection Points
Locations .......................................................................................................................................................................... 30
System Interface Circuit Cards Connections (if required).................................................31
IB2 Controller Interface Board) Connections (if required) ............................................... 34
Controller CAN Bus..................................................................................................................................................39
Controller Ethernet Connection (if required)........................................................................ 40
-48V DC Output Connections ................................................................................................................41
Installing the Rectifier Modules and Initially Starting the System.......... 44

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Installing the Rectifier Modules into Spec. No. 588705000 Rectifier
Module Mounting Shelves.........................................................................................................................44
Procedure......................................................................................................................................................................... 44
Initially Starting, Configuring, and Checking System Operation .........................45
Checking System Status..............................................................................................................................51
Final Steps ................................................................................................................................................................. 52
Operating Procedures.......................................................................................... 53
Controller and Rectifiers.............................................................................................................................. 53
ESTOP Function.................................................................................................................................................. 53
NCU Battery Charge Current Limit Feature............................................................................53
Local Controls and Indicators................................................................................................................ 53
Maintenance ........................................................................................................... 54
System Maintenance Procedures......................................................................................................54
Adding a Rectifier Module to an Existing Rectifier Module Mounting
Shelf Spec. No. 588705000......................................................................................................................54
Installing a Field Expansion Rectifier Module Mounting Shelf Spec.
No. 588705000.....................................................................................................................................................54
Troubleshooting and Repair............................................................................... 55
Contact Information.........................................................................................................................................55
Controller and Rectifiers.............................................................................................................................. 55
NCU Controller Configuration................................................................................................................ 55
System Troubleshooting Information ............................................................................................55
Replacement Information...........................................................................................................................56
Replacement Procedures...........................................................................................................................56

Vertiv |NetSure -48V DC Bulk Output Power System Installation and User Instructions (UM582127100)|Rev. E
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ADMONISHMENTS USED IN THIS DOCUMENT
DANGER
! Warns of a hazard the reader will be exposed to that will likely result
in death or serious injury if not avoided. (ANSI, OSHA)
WARNING
! Warns of a potential hazard the reader may be exposed to that could
result in
death or serious injury if not avoided. This admonition is not used for situations that pose a
risk only to equipment, software, data, or service. (ANSI)
CAUTION
! Warns of a potential hazard the reader may be exposed to that could
result in minor or moderate injury if not avoided. (ANSI, OSHA) This admonition is not
used for situations that pose a risk only to equipment, data, or service, even if such use
appears to
be permitted in some of the applicable standards. (OSHA)
ALERT
! Alerts the reader to an action that must be avoided in order to protect
equipment, software, data, or service. (ISO)
ALERT
! Alerts the reader to an action that must be performed in order to prevent
equipment damage, software corruption, data loss, or service interruption. (ISO)
FIRE SAFETY
! Informs the reader of fire safety information, reminders, precautions,
or policies, or of the locations of fire
-fighting and fire-safety equipment. (ISO)
SAFETY
! Informs the reader of general safety information, reminders, precautions, or
policies not
related to a particular source of hazard or to fire safety. (ISO, ANSI, OSHA)

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IMPORTANT SAFETY INSTRUCTIONS
General Safety
DANGER! YOU MUST FOLLOW APPROVED SAFETY PROCEDURES.
Performing the following procedures may expose you to hazards. These procedures should be
performed by qualified technicians familiar with the hazards associated with this type of equipment.
These hazards may include shock, energy, and/or burns. To avoid these hazards:
a) The tasks should be performed in the order indicated.
b) Remove watches, rings, and other metal objects.
c) Prior to contacting any uninsulated surface or termination, use a voltmeter to verify that no voltage
or the expected voltage is present. Check for voltage with both AC and DC voltmeters prior to
making contact.
d) Wear eye protection.
e) Use certified and well maintained insulated tools. Use double insulated tools appropriately rated for
the work to be performed.
Voltages
AC Input Voltages
DANGER! This system operates from AC input voltage capable of producing fatal electrical shock. AC
input power must be completely disconnected from the branch circuits wiring used to provide power to
the system before any AC electrical connections are made. Follow local lockout/tagout procedures to
ensure upstream branch circuit breakers remain de-energized during installation. DO NOT apply AC
input power to the system until all electrical connections have been completed and checked.
DC Output and Battery Voltages
DANGER! This system produces DC power and may have a battery source connected to it. Although
the DC voltage is not hazardously high, the rectifiers and/or battery can deliver large amounts of current.
Exercise extreme caution not to inadvertently contact or have any tool inadvertently contact an output
terminal or battery terminal or exposed wire connected to an output terminal or battery terminal.
NEVER allow a metal object, such as a tool, to contact more than one termination or battery terminal at a
time, or to simultaneously contact a termination or battery terminal and a grounded object. Even a
momentary short circuit can cause sparking, explosion, and injury.
DANGER! Follow local lockout/tagout procedures to ensure DC branch circuit protection devices
remain de-energized during installation at loads, as required.

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Battery
Refer to the battery manufacturer documentation for specific battery safety instructions. The following are
general guidelines.
WARNING! Correct polarity must be observed when connecting battery leads.
WARNING! Special safety precautions are required for procedures involving handling, installing, and
servicing batteries. Observe all battery safety precautions in this manual and in the battery instruction
manual. These precautions should be followed implicitly at all times.
WARNING! A battery can present a risk of electrical shock and high short circuit current. Servicing of
batteries should be performed or supervised only by properly trained and qualified personnel
knowledgeable about batteries and the required precautions.
The following precautions should be observed when working on batteries:
•Remove watches, rings, and other metal objects.
•Eye protection should be worn to prevent injury from accidental electrical arcs.
•Use certified and well maintained insulated tools. Use double insulated tools appropriately rated for
the work to be performed. Ensure that wrenches with more than one working end have only one
end exposed.
•Do not lay tools or metal parts on top of batteries.
•Disconnect charging source prior to connecting or disconnecting battery terminals.
•Risk of explosion if battery is replaced with an incorrect type or if polarity is reversed.
Recommended to replace batteries with the same manufacturer and type, or equivalent.
•Dispose of used batteries according to the instructions provided with the batteries. Do not dispose
of batteries in a fire. They may explode.
•ALWAYS FOLLOW THE BATTERY MANUFACTURER’S RECOMMENDATIONS AND SAFETY
INSTRUCTIONS.
DANGER! This equipment may be used in conjunction with lead-acid batteries. Working near lead-acid
batteries is dangerous!
In addition to the hazard of electric shock, gas produced by batteries can be explosive and sulfuric acid
can cause severe burns.
•Do not open or mutilate batteries. Released electrolyte is harmful to the skin and eyes, and is toxic.
•Batteries contain sulfuric acid.
•Batteries generate explosive gases during normal operation. Systems containing batteries should
never be installed in an airtight room or space. Only install in a ventilated environment.
•Batteries are an energy source that can produce high amounts of electrical current.

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FOR THESE REASONS, IT IS OF CRITICAL IMPORTANCE THAT YOU READ THESE INSTRUCTIONS
AND FOLLOW THEM EXACTLY.
WHEN WORKING WITH LEAD-ACID BATTERIES:
•Follow the recommended PPE requirements per the SDS for the battery to be used.
•If battery acid enters your eye, immediately flush your eye with running cold water for at least 15
minutes. Get medical attention immediately.
•If battery acid contacts skin or clothing, wash immediately with soap and water.
ALERT! Performing maintenance and/or troubleshooting procedures may interrupt power to the loads,
if battery reserve is not sufficient.
Personal Protective Equipment (PPE)
DANGER! ARC FLASH AND SHOCK HAZARD.
Appropriate PPE and tools required when working on this equipment. An appropriate flash protection
boundary analysis should be done determine the “hazard/risk” category, and to select proper PPE.
This product is intended only for installation in a Restricted Access Location.
Only authorized and properly trained personnel should be allowed to install, inspect, operate, or maintain
the equipment.
Do not work on LIVE parts. If required to work or operate live parts, obtain appropriate Energized Work
Permits as required by the local authority, per NFPA 70E “Standard for Electrical Safety in the
Workplace”.
Hazardous Voltage
DANGER! HAZARD OF ELECTRICAL SHOCK.
More than one disconnect may be required to de-energize the system before servicing.
Handling Equipment Containing Static Sensitive Components
ALERT! Installation or removal of equipment containing static sensitive components requires careful
handling. Before handling any equipment containing static sensitive components, read and follow the
instructions contained on the Static Warning Page.
Maintenance and Replacement Procedures
CAUTION! When performing any step in procedures that requires removal or installation of hardware,
use caution to ensure no hardware is dropped and left inside the unit; otherwise service interruption or
equipment damage may occur.
NOTE! When performing any step in procedures that requires removal of existing hardware, retain all
hardware for use in subsequent steps, unless otherwise directed.

Vertiv |NetSure -48V DC Bulk Output Power System Installation and User Instructions (UM582127100)|Rev. E
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STATIC WARNING
This equipment contains static sensitive components. The warnings listed below must be observed to
prevent damage to these components. Disregarding any of these warnings may result in personal injury
or damage to the equipment.
1. Strictly adhere to the procedures provided in this document.
2. Before touching any equipment containing static sensitive components, discharge all static
electricity from yourself by wearing a wrist strap grounded through a one megohm resistor. Some
wrist straps have a built-in one megohm resistor; no external resistor is necessary. Read and follow
wrist strap manufacturer’s instructions outlining use of a specific wrist strap.
3. Do not touch traces or components on equipment containing static sensitive components. Handle
equipment containing static sensitive components only by the edges that do not have connector
pads.
4. After removing equipment containing static sensitive components, place the equipment only on
conductive or anti-static material such as conductive foam, conductive plastic, or aluminum foil. Do
not use ordinary Styrofoam™or ordinary plastic.
5. Store and ship equipment containing static sensitive components only in static shielding containers.
6. If necessary to repair equipment containing static sensitive components, wear an appropriately
grounded wrist strap, work on a conductive surface, use a grounded soldering iron, and use
grounded test equipment.

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SYSTEM OVERVIEW
Customer Documentation Package
This document (UM582127100) provides Installation and User Instructions for NetSure™ -48V DC Bulk Output
Power System Model 722NBBB, Spec. No. 582127100.
The complete Customer Documentation Package consists of…
NetSure™ -48V DC Bulk Output Power System Installation and User Manual
•Power System Installation and User Instructions: UM582127100
NetSure™ NCU Controller User Manual
•NCU Controller User Instructions: UM1M830BNA
USB Drive with All Customer Documentation
•Power System Installation and User Instructions: UM582127100
•Power System “System Application Guide”: SAG582127100
•Rectifier Module Mounting Shelf Power Data Sheet: PD588705000
•Rectifier Instructions: UM1R483500E
•NCU Controller User Instructions: UM1M830BNA
•Engineering Drawings
•Also provided on the USB drive is a controller configuration drawing and the controller configuration
files loaded into the controller as shipped.
System Description
-48V DC @ up to 2000 Amperes Bulk Output Power System
The NetSure™ 722NBBB Bulk Output Power System is intended for use to expand or replace legacy -48V DC
rectifiers while retaining the distribution power board. It can be used with any -48V DC power system,
regardless of vendor or plant type.
The 722NBBB is an integrated power system containing rectifiers, intelligent control, metering, and monitoring.
This power system is designed to power a load while charging a positive grounded battery. This power system
is capable of operating in a batteryless installation or off battery for maintenance purposes. The power system
is designed for operation with the positive output grounded.
This system consists of the following components.
Main Rectifier Module Mounting Shelf
The system contains a main rectifier module mounting shelf. This shelf houses up to five (5) rectifier modules,
the controller, a controller interface board, and a system interface board. Refer to Power Data Sheet
PD588705000 for more information.
NCU (NetSure Control Unit): The controller provides power system control (including optional low voltage
battery disconnect (LVBD) and low voltage load disconnect (LVLD) control), rectifier control (including a
charge control function), metering functions, monitoring functions, and local/remote alarm functions. The

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controller also supports rectifier temperature compensation if the system is equipped with a temperature
probe(s). Temperature probe(s) may also be designated to monitor ambient temperature and/or battery
temperature. The controller also provides data acquisition, system alarm management, and advanced battery
and energy management. The controller contains a color LCD display and keypad for local access. The
controller provides an Ethernet port and comes with comprehensive webpages for remote access. The
controller has SNMP v3 capability for remote system management. The controller supports software upgrade
via its USB port. Refer to the NCU Controller Instructions (UM1M830BNA) for more information.
Expansion Rectifier Module Mounting Shelf
The system contains one or more expansion rectifier module mounting shelves, each of which houses up to six
(6) rectifier modules. Refer to Power Data Sheet PD588705000 for more information.
Rectifier Modules
The system contains rectifier modules, which provide load power, battery float current, and battery recharge
current during normal operating conditions. Refer to the Rectifier Instructions (UM1R483500E) for more
information.
INSTALLATION ACCEPTANCE CHECKLIST
Provided in this section is an Installation Acceptance Checklist. This checklist helps ensure proper installation
and initial operation of the system. As the procedures presented in this document are completed, check the
appropriate box on this list. If the procedure is not required to be performed for your installation site, also
check the box in this list to indicate that the procedure was read. When installation is done, ensure that each
block in this list has been checked. Some of these procedures may have been factory performed for you.
NOTE! The system is not powered up until the end of this checklist.
NOTE! Some of these procedures may have been performed at the factory for you.
Installing the System
Relay Rack Secured to Floor
System Components Mounted in Relay Rack and Interconnected (if required)
Setting Switch Options
Factory Switch Setting on IB2 Interface Board Verified
Making Electrical Connections
Relay Rack Grounding Connection (Frame Ground) Made
AC Input and AC Input Equipment Grounding Connections Made
External Alarm, Reference, Monitoring, and Control Connections Made
Controller Ethernet Connection Made (if required)
-48V DC Output Connections Made

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Installing the Rectifier Modules and Initially Starting the System
Rectifier Modules Installed
System Started, Configured, and Checked
INSTALLING THE SYSTEM
General Requirements
•This product is intended only for installation in a restricted access location on or above a non-
combustible surface.
•This product must be located in a controlled environment with access to crafts persons only.
•This product is intended for installation in network telecommunication facilities (CO, vault, hut, or other
environmentally controlled electronic equipment enclosure).
•This product is intended for connection to the common bonding network in a network
telecommunication facility (CO, vault, hut, or other environmentally controlled electronic equipment
enclosure).
•The DC return connection to this system can remain isolated from system frame and chassis (DC-I).
•This system is suitable for installation as part of the Common Bonding Network (CBN).
•The installer should be familiar with the installation requirements and techniques to be used in securing
the relay rack to the floor.
•Rectifier and rectifier module mounting shelf ventilating openings must not be blocked and temperature
of air entering rectifiers must not exceed rated operating ambient temperature range found in
SAG582127100.
•Clearance requirements are:
a) Recommended minimum aisle space clearance for the front of each bay is 2' 6".
b) Minimum spacing from the rear of the bay to a wall or other solid surface is that which is specified
for proper rectifier module mounting shelf ventilation. Refer to the rectifier module mounting shelf
Power Data Sheet for ventilation spacing requirements.
NOTE! Minimum rear spacing specified for ventilation may not permit installation and
maintenance of the system.
Recommended minimum aisle space clearance for the rear of each bay is 2’ 0” to allow for
installation and maintenance.

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Securing the Relay Rack to the Floor
Secure the relay rack to the floor per site requirements. Refer to “General Requirements” on page 13.
Ventilation Requirements
Refer to “General Requirements” on page 13.
Relay Rack Floor Mounting Dimensions
Refer to Figure 1for relay rack floor mounting dimensions.
Mounting System Components in a Relay Rack
NOTE! If the power system was ordered in a relay rack, these procedures have been performed at the
factory.
This power system is designed to mount in a standard 23” relay rack having 1” or 1-3/4” multiple drillings. Refer
to System Application Guide SAG582127100 for overall dimensions and a list of available relay racks.
Mounting the Rectifier Module Mounting Shelf(s) to a Relay Rack
DANGER! The relay rack must be securely anchored to the floor before the rectifier module mounting
shelf(s) is installed.
NOTE! If the system was shipped on shipping rails, rectifier module mounting shelves are installed in
groups of two or less. Space has been provided for pallet forks to fit between the sets of rectifier module
mounting shelves. Simply rest the pallet forks on the bottom-most rectifier module mounting shelf,
unbolt the shelves from the shipping rails, transfer the shelves to the relay rack, and re-secure the
shelves to the relay rack.
NOTE! Refer to Figure 2 as this procedure is performed.
Procedure
1. If multiple shelves are in the system, remove the rear center shield from each. Save hardware for later
re-installation.
2. If multiple shelves are in the system, remove and discard the bottom section of the rear center shield
from all shelves except the bottom shelf.
NOTE! In multiple shelf systems, apply electrical anti-oxidizing compound to busbar mating surfaces
before performing the next step.
3. Position the rectifier module mounting shelf in the relay rack. In multiple shelf systems, align the holes in
the mating busbars before securing the shelves to the relay rack.
NOTE! Install the ground washers in the next step so the teeth dig into the paint on the mounting
angles.

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4. Secure the rectifier module mounting shelf to the relay rack. Torque all screws to 65 in-lbs.
Hardware build-up is:
12-24 x 3/4" screw and flat washer,
(1) set per side.
12-24 x 3/4" screw and ground washer,
(1) set per side.
5. Repeat for any additional rectifier module mounting shelf. Rectifier module mounting shelves are install
directly below each other with no space between them. The main shelf (the one with the NCU
Controller) should be the top-most shelf.
Interconnecting the Rectifier Module Mounting Shelves Output Busbars in Multiple Shelf Systems
NOTE! Refer to Figure 3 as this procedure is performed.
Procedure
1. The mating busbars are factory installed on the expansion rectifier module mounting shelf. Secure
these busbars to the output busbars on the shelf above it. Hardware is provided with the expansion
rectifier module mounting shelf.
Hardware build-up for these connections is:
1/4-20 x 7/8" Bolt,
1/4" Belleville Lock Washer,
1/4" Flat Washer.
Install the Belleville lock washer so the concave side is towards the busbar. Torque all connections to 60
in-lbs.
NOTE! Some systems may come with two shelves connected together with a common relay rack
mounting bracket and an output busbar spanning both shelves. Connect these shelves to other shelves
in the same manner as described here.
2. Repeat this procedure for each expansion rectifier module mounting shelf.
Changing the Direction of the DC Output Cables
DC output cables can either enter from the right, from the left, or from the rear. To reconfigure the shelf for
these options, remove the appropriate shield and position the DC output busbars per the following procedure.
The DC output busbars are factory connected for DC output cables entering from the right as viewed from the
front.
Procedure
NOTE! Refer to Figure 4 as this procedure is performed.
1. In Figure 4, select the view for your DC output cabling requirements (left, right, or rear).
2. Remove the appropriate shield as required as shown in the selected view.

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3. Reposition the DC output lug landing busbars as shown in the selected view.
Figure 1: Relay Rack Floor Mounting Dimensions

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Figure 2: Rectifier Module Mounting Shelf Mounting
Front
If multiple shelves are in the system,
remove the rear center shield from each.
Save hardware for later re-installation.
If multiple shelves are in the system,
remove and discard the bottom section
of rear center shield for all shelves
except the bottom shelf.
Rear
Bottom
Section
Secure each shelf to the relay rack.
Mounting Hardware
12-24 x 3/4" Thread Forming
Hex Head Screw (two per side)
No. 10/12 Ground Washer (one per side)
No. 12 Flat Washer (one per side)

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Figure 3: Interconnecting the Rectifier Module Mounting Shelves Output Busbars
Rear
Components removed in
illustration for clarity only.
1/4-20 x 7/8” Bolt
1/4” Belleville Lock Washer
1/4” Flat Washer
Busbar
(Torque to 60 in-lbs.)

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Figure 4: Changing the Direction of the DC Output Cables
Rear Rear
Rear
Rear
Rear
Busbar Hardware Build-Up
1/4-20 x 7/8” Bolt
1/4” Belleville Lock Washer
1/4” Flat Washer
Busbar
(Torque to 60 in-lbs.)
DC Output Cables
Entering from the Right
(as viewed from the front)
DC Output Cables
Entering from the Left
(as viewed from the front)
DC Output Cables
Entering from the Rear
Reference Views
Left side busbar shown
mounted in lower mounting holes.
Right side busbar shown
mounted in upper mounting holes.
Left Side
Busbar
Right Side
Busbar
Right side shield removed.
Rear-bottom shield not shown.
Right side busbar mounted
in lower mounting holes.
Left side busbar mounted
in upper mounting holes.
Left side shield removed.
Rear-bottom shield not shown.
References to left and right
are as viewed from the front.
Right side busbar mounted
in lower mounting holes.
Left side busbar mounted
in lower mounting holes.
Right side busbar mounted
in upper mounting holes.
Left side busbar mounted
in lower mounting holes.
Section of rear-bottom
shield removed.

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Interconnecting the Rectifier Module Mounting Shelves CAN Bus
Each Spec. No. 588705000 rectifier module mounting shelf in the system is daisy-chained to the controller. An
NCU CAN Bus connector is located at the top of each shelf and another at the bottom of each shelf. These
connectors are used to interconnect the shelves to the controller. Refer to Figure 5for connector locations.
These connections are factory made for shelves factory installed. These connections must be made if a
rectifier module mounting shelf(s) is field installed.
•The top connector of the top most rectifier module mounting shelf (main shelf) is internally connected
to the controller.
•The bottom connector of a shelf plugs into the top connector on the shelf below it.
•The bottom connector on the bottom-most shelf must be terminated with a termination plug.
Procedure
NOTE! Refer to Figure 5 as this procedure is performed.
1. Connect the bottom connector on the main shelf to the top connector on the 1st expansion shelf.
2. Connect the bottom connector on the 1st expansion shelf to the top connector on the 2nd expansion
shelf.
3. Connect the bottom connector on the 2nd expansion shelf to the top connector on the 3rd expansion
shelf.
4. Connect the bottom connector on the 3rd expansion shelf to the top connector on the 4th expansion
shelf.
5. Connect the bottom connector on the 4th expansion shelf (or bottom-most shelf for systems with less
than four expansion shelves) to CAN Bus Jumper P/N 556430. Route CAN Bus Jumper P/N 556430
within the interiors of the shelves to the controller area in the main shelf. Terminate CAN Bus Jumper
P/N 556430 with termination plug P/N 556273.