Vertiv NetSure 5100 Series User manual

NetSure™ 5100 Series
-48 VDC Power System
Installation Manual (IM582137200), Revision J
Specification Number: 582137200
Model Number: 5100

Vertiv |NetSure™ 5100 Series -48 VDC Power System Installation Manual (IM582137200)|Rev. J
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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™ 5100 Series -48 VDC Power System Installation Manual (IM582137200)|Rev. J
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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
Customer Documentation Package....................................................................11
Installation Acceptance Checklist......................................................................11
Installing the System............................................................................................. 13
General Requirements....................................................................................................................................13
Securing the Relay Rack to the Floor (if furnished) .........................................................13
Securing the System to a Relay Rack or a Cabinet Equipment Rack
(if required)................................................................................................................................................................15
Securing the System Vertically to a Wall with P/N 553203Kit (if
furnished) .................................................................................................................................................................... 17
Securing the System Horizontally to a Wall with P/N 552537 or P/N
552535 Kit (if furnished)...............................................................................................................................19
Installing a List 93, 94 Battery Tray ................................................................................................. 22
Installing Circuit Breakers and Fuses ............................................................................................. 25
Installing an Optional Battery Cabinet............................................................................................27
Installing an Optional External IB4 Kit P/N 561929.......................................................... 28
Attaching the USB Drive Pouch to the System ...................................................................29
Setting Jumper and Switch Options ................................................................ 30
Circuit Card Locations...................................................................................................................................30
Jumper Settings on the System Interface Circuit Card................................................31
Switch Settings on the IB2 (Controller Interface Board) (if furnished) ........ 33
Making Electrical Connections .......................................................................... 35
Important Safety Instructions ................................................................................................................35
Wiring Considerations....................................................................................................................................35
Relay Rack / Cabinet Frame Grounding Connection......................................................35
System Shelves Frame Grounding Connection ...................................................................36
Central Office Ground Connection ...................................................................................................38
Rectifier Nominal 120 VAC / 208 VAC / 240 VAC Input and AC Input
Equipment Grounding Connections................................................................................................38
External Alarm, Reference, Monitoring, and Control Connections ....................41
Circuit Card Locations.......................................................................................................................................... 41

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RS-485 Connection (used for Communication with SM Modules)...........................42
Temperature Probes ..............................................................................................................................................42
System Interface Circuit Card Connections (if required)...................................................42
IB2 (Controller Interface Board) Connections (if furnished) ..........................................44
Connecting a Device or System to the NCU CAN Bus (if required)....................... 54
NCU Controller Ethernet Connection (if required) ..........................................................55
Control Bus Connections between Controller and System Shelves ............... 57
Load Distribution Wiring, Input Battery Wiring, and CO Ground
Wiring..............................................................................................................................................................................59
Load Distribution Wiring, Input Battery Wiring, and CO Ground Wiring
To List BF and NF .................................................................................................................................................... 59
Load Distribution Wiring, Input Battery Wiring, and CO Ground Wiring
to List BC, LC, And NC......................................................................................................................................... 60
Load Distribution Wiring, Input Battery Wiring, and CO Ground Wiring
to List BA And NA.................................................................................................................................................... 60
Connecting to an Optional Battery Cabinet ............................................................................64
Installing and Connecting Batteries in an Optional List 93 or 94
Battery Tray (if furnished).........................................................................................................................64
Installing Rectifier Modules................................................................................ 67
Initially Starting, Configuring, and Checking System Operation............. 67
Initial Startup Preparation.......................................................................................................................... 67
Initially Starting the System..................................................................................................................... 67
NCU Controller Initialization....................................................................................................................67
Verifying and Setting the NCU Controller as Required for Your
Application ................................................................................................................................................................70
Checking System Status.............................................................................................................................79
Final Steps ................................................................................................................................................................. 79

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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 o
nly 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 lo
ss, 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.
•Verify that no current will flow when the battery is connected or disconnected by opening battery
disconnects (if available) or adjusting the system to match battery voltage.
•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.

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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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CUSTOMER DOCUMENTATION PACKAGE
This document (IM582137200) provides Installation Instructions for the NetSure™ 5100 Series -48 VDC Power
System: Model 5100, Spec. No. 582137200.
The complete Customer Documentation Package consists of…
NetSure™-48 VDC Power System Installation Manual
•Power System Installation Instructions: IM582137200
NetSure™NCU Controller User Manual
•NCU Controller User Instructions: UM1M830BNA
USB Drive with All Customer Documentation
•Power System Installation Instructions: IM582137200
•Power System User Instructions: UM582137200
•Power System “System Application Guide”: SAG582137200
•NCU Controller User Instructions: UM1M830BNA
•Rectifier Instructions: UM1R482000e3
•Engineering Drawings
-SD582137200
-T582137200
•Also provided on the USB drive is a controller configuration drawing and the controller configuration
files loaded into the controller as shipped.
For factory settings of all configurable controller parameters, refer to the Configuration Drawing (C-drawing)
supplied with your power system.
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 (if furnished)
System Secured to Relay Rack or Cabinet Equipment Rack (if required)

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System Secured to Suitable Wall (if required)
Optional Battery Tray Installed
Optional Battery Tray Battery Disconnect Circuit Breaker Installed
Circuit Breakers and/or Fuses Installed
Setting Jumper and Switch Options
Jumper on System Interface Circuit Card Set
Factory Switch Setting on IB2 (Controller Interface Board) Verified
Making Electrical Connections
Relay Rack / Cabinet Frame Grounding Connection Made
System Shelves Frame Grounding Connection Made
Central Office Ground Connection Made
Rectifier AC Input and AC Input Equipment Grounding Connections Made
External Alarm, Reference, Monitoring, and Control Connections to System Interface Circuit Card Made
External Alarm, Reference, Monitoring, and Control Connections to IB2 (Controller Interface Board)
Made
External Device (such as SM-Temp Module) Connection to NCU Controller CAN Bus Made (if required)
NCU Controller Ethernet Port Connection Made
NCU Controller Second Ethernet Port Connection Made (if required)
Factory NCU Control Bus Connections between NCU Controller and System Shelves Verified
Load Connections Made
Battery Connections Made
oBatteries Installed and Connected in an Optional Battery Tray
oBatteries Installed and Connected in an Optional Battery Cabinet
oExternal Batteries Connected
Installing the Modules
Rectifier Modules Installed
Initially Starting the System
System Started, Configured, and Checked

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INSTALLING THE SYSTEM
General Requirements
•The installer should be familiar with the installation requirements and techniques to be used in securing
the relay rack (if furnished) to the floor.
•The installer should be familiar with the installation requirements and techniques to be used in securing
the system to a relay rack or equipment rack.
-The top rear cover needs to be removed to access the battery and CO ground connection points. If
other equipment is mounted above the shelf, leave enough clearance to access the screws securing
the cover.
•The installer should be familiar with the installation requirements and techniques to be used in securing
the system to a suitable wall (if required).
•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
electronic equipment enclosure that maintains temperature from -5 °C to +50 °C for Class 1 equipment
or from -40 °C to +65 °C for Class 2 equipment.
•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).
•System ventilating openings must not be blocked and temperature of air entering rectifiers must not
exceed rated operating ambient temperature range found in SAG582137200.
•Clearance requirements are (relay rack):
-Recommended minimum aisle space clearance for the front of each bay is 2' 6".
-Recommended minimum aisle space clearance for the rear of each bay is 2’ 0”.
•Clearance requirements are (cabinet or wall mounting):
-Recommended minimum clearance for the rear of the system is 4”.
Securing the Relay Rack to the Floor (if furnished)
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 1and Figure 2for relay rack floor mounting dimensions.

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Figure 1: Relay Rack Floor Mounting Dimensions - 23”
Part No. 559817
Part No. 559819
Part No. 559818, 559820,
559821, 559822
17.50
20.13
24.38
2.13
3.44
9.88
12.53
15.00
1.24
2.56
0.875 Dia.
(8 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
22.500
24.750
1.125
15.000
17.500
20.125
25.000
2.437
3.750
9.871
12.531
15.031
1.250
2.580
2.00
1.00
1.00
2.00
2.00
2.00
5.00
0.437 Dia.
(12 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
0.875 Dia.
(8 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 1 Place)
Notes:
1. All dimensions are in inches.

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Figure 2: Relay Rack Floor Mounting Dimensions - 19”
Securing the System to a Relay Rack or a Cabinet Equipment Rack (if required)
DANGER! If the system is mounted in a relay rack, the relay rack must be securely anchored to the floor
before the system is installed.
NOTE! If the power system was ordered in a relay rack, these procedures have been performed at the
factory.
NOTE! Refer to “General Requirements” on page 13 for mounting restrictions and ventilation
requirements.
NOTE! The distribution unit is factory connected to the rectifier/controller shelf. The distribution unit
with rectifier/controller shelf is mounted as a complete system.
Part No. 559823
Part No. 559824
13.50
16.13
20.38
2.13
3.44
9.88
12.53
15.00
1.24
2.56
0.875 Dia.
(8 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
Masked for Frame Ground Lug
0.281 Dia. Holes on 0.625 Centers
(Top of Rack, 2 Places)
14.13
16.75
21.00
2.13
3.44
9.38
12.03
15.00
1.49
2.81
0.875 Dia.
(8 Places)
Notes:
1. All dimensions are in inches.

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NOTE! The system is furnished for 19” mounting as standard. This requires rear AC connections for the
controller/rectifier shelf. 23” mounting bracket adapters are available for 23” mounting. If the front
accessed AC connector option was ordered, the AC option is built into the mounting bracket and
requires 23” mounting. The expansion rectifier shelf is always furnished with 19’ mounting brackets and
rear AC connectors. 23” mounting bracket adapters are available for 23” mounting. Wall mounting
options are also available.
NOTE! Refer to UM582137200 for a procedure for field installing an expansion rectifier shelf to the
system.
This power system is designed to mount in a standard 19” or 23” relay rack or equipment rack having 1” or 1 3/4”
multiple drillings. Refer to System Application Guide SAG582137200 for overall dimensions and a list of
available relay racks.
Procedure
1. Position the system in the relay rack or cabinet equipment rack.
2. Secure the system to the relay rack or cabinet equipment rack using hardware as shown in Figure 3
(see Figure 3for recommended torque). Use grounding washers as indicated in Figure 3.
NOTE! Install (orient) the ground washers so the teeth dig into the mounting angles for a secure
ground connection.
NOTE! Compliance with Telcordia GR-1089-CORE requires that prior to mounting the system to the
equipment rack:
-All paint must be removed from the front surface of each equipment rack rail where it mates with a
shelf-mounting bracket, so that good metal-to-metal contact can be established between the shelf
and rack.
-The shelf-to-rack mating surfaces must be cleaned.
-Electrical anti-oxidizing compound must be applied to the shelf-to-rack mating surfaces.
Figure 3: Mounting the System in a Relay Rack or a Cabinet Equipment Rack
MOUNTING HARDWARE
12-24 x 3/4" Thread Formin
g
Hex Head Screw
No. 10/12 Ground Washer
Torque: 65 in-lbs.
Front

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Securing the System Vertically to a Wall with P/N 553203Kit (if furnished)
An optional wall mount bracket kit (P/N 553203) is available for vertical wall mounting of the system.
NOTE! Refer to “General Requirements” on page 13 for mounting restrictions and ventilation
requirements.
NOTE! Refer to Figure 4 when performing this procedure.
Procedure
1. The installer must provide fasteners for securing the system to a wall or other vertical surface. Ensure
that the wall and fastening technique are suitable for supporting the weight of the system. Suggested
anchors are listed in the illustrations. Refer to System Application Guide SAG582137200 for system
weight and additional dimensions.
2. Attach the brackets to the system mounting angles using kit-furnished screws. Torque to 60 in-lbs.
3. Use drill guide dimensions in the illustration to prepare the wall for customer-furnished fasteners.
Secure the system to the wall.

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Figure 4: Vertical Wall Mounting with P/N 553203
Notes:
1. All dimensions are in inches,
unless otherwise specified.
2. Installer to furnish hardware
for fastening brackets to wall.
Use (2) wall anchors per bracket.
For solid concrete block, hard
natural stone or solid brick, use
Hilti HLC H 5/16 X 1-5/8 or similar.
Wall Mount Drilling Guide (Not to scale)
All dimensions are in inches.
3-1/8
18-15/16 (19” Mounting)
22-29/32 (23” Mounting)
3/8 Dia. Clearance Hole
in Bracket for Wall Fastener
(Front)
3/8 Dia.
Top View
Right Side View
Bottom of Shelf
Front View
(19” Mounting, 23” Similar)
Left Side View
3.125
4.625
18.936 (19” Mounting, shown)
22.906 (23” Mounting)
20.543 (19” Mounting, shown)
24.513 (23” Mounting)

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Securing the System Horizontally to a Wall with P/N 552537 or P/N 552535 Kit (if
furnished)
An optional wall mount bracket kit (P/N 552537 for 19” mounting and P/N 552535 for 23” mounting) is available
for horizontal wall mounting of the system.
NOTE! Refer to “General Requirements” on page 13 for mounting restrictions and ventilation
requirements.
NOTE! Refer to Figure 5 or Figure 6 when performing this procedure.
Procedure
1. The installer must provide fasteners for securing the system to a wall or other horizontal surface.
Ensure that the wall and fastening technique are suitable for supporting the weight of the system. Refer
to System Application Guide SAG582137200 for system weight and additional dimensions.
2. Prepare the wall for customer-furnished fasteners. Secure the wall bracket to the wall.
3. Attach the system to the wall bracket using the standard mounting technique. See “Securing the
System to a Relay Rack or a Cabinet Equipment Rack (if required)” on page 15.

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Figure 5: Horizontal Wall Mounting with P/N 552537
Notes:
1. All dimensions are in inches,
unless otherwise specified.
2. Installer to furnish hardware
for fastening bracket to wall.
552537
Frame Grounding Point
(1/4-20 Studs on 5/8” Centers)