Vertiv NetSure PLM80142 User manual

NetSure™ -48 VDC Power System
Installation and User Manual
Specification Number: PLM80142

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
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 the accuracy and completeness of this document, Vertiv
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.
The products covered by this instruction manual are manufactured and/or
sold by Vertiv. This document is the property of Vertiv and contains
confidential and proprietary information owned by Vertiv. Any copying, use or
disclosure of it without the written permission of Vertiv is strictly prohibited.
Names of companies and products are trademarks or registered trademarks of
the respective companies. Any questions regarding usage of trademark
names should be directed to the original manufacturer.
Technical Support Site
If you encounter any installation or operational issues with your product, check the pertinent section of this
manual to see if the issue can be resolved by following outlined procedures.
Visit https://www.vertiv.com/en-us/support/ for additional assistance.

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
iii
TABLE OF CONTENTS
Admonishments Used in this Document..............................................................................................................................v
Important Safety Instructions.................................................................................................................................................vi
Safety Admonishments Definitions .........................................................................................................................................................................................................................vi
Safety and Regulatory Statements..........................................................................................................................................................................................................................vi
Déclarations de Sécurité et de Réglementation..........................................................................................................................................................................................vi
1System Description ................................................................................................................................................................1
1.1 Overview Illustration...................................................................................................................................................................................................................................................2
1.2 Dimensions..........................................................................................................................................................................................................................................................................3
1.3 Specifications....................................................................................................................................................................................................................................................................4
1.4 Items Ordered Separately.....................................................................................................................................................................................................................................5
1.4.1 Rectifier Modules....................................................................................................................................................................................................................................5
1.4.2 Load Lead Assembly for 10A GMT Fuse Positions ................................................................................................................................................6
1.4.3 GMT Load Distribution Fuses.....................................................................................................................................................................................................6
1.4.4 Bullet Nose-Type Battery Disconnect and Load Distribution Circuit Breakers...........................................................................7
1.4.5 Temperature Probe..............................................................................................................................................................................................................................7
2Installation Acceptance Checklist ...................................................................................................................................9
3Installing the System ..........................................................................................................................................................10
3.1 General Requirements...........................................................................................................................................................................................................................................10
3.2 Securing the Power/Distribution Shelf to the Equipment Cabinet..............................................................................................................................10
3.3 Installing Circuit Breakers and Fuses......................................................................................................................................................................................................10
3.3.1 GMT Load Distribution Fuses..................................................................................................................................................................................................10
3.3.2 Bullet Nose-Type Battery Disconnect and Load Distribution Circuit Breakers......................................................................... 11
4Making Electrical Connections .......................................................................................................................................12
4.1 Important Safety Instructions..........................................................................................................................................................................................................................12
4.2 Wiring Considerations.............................................................................................................................................................................................................................................12
4.3Power/Distribution Shelf Frame Grounding Connection .......................................................................................................................................................12
4.4 AC Input and AC Input Equipment Grounding Connections.............................................................................................................................................13
4.5 External Interface Connections ....................................................................................................................................................................................................................14
4.5.1 Digital Inputs............................................................................................................................................................................................................................................14
4.5.2 Relay Outputs .........................................................................................................................................................................................................................................14
4.6 Ethernet Connection...............................................................................................................................................................................................................................................19
4.7 Load Connections ....................................................................................................................................................................................................................................................20
4.7.1 To GMT Fuse Positions ................................................................................................................................................................................................................20
4.7.2 To Bullet Nose-Type Load Distribution Circuit Breaker Positions.........................................................................................................21
4.8 CO Ground Connection....................................................................................................................................................................................................................................... 24
4.9 Battery Connections .............................................................................................................................................................................................................................................. 24
4.10 Important Safety Instructions........................................................................................................................................................................................................................24
4.10.1 To Bullet Nose-Type Circuit Breaker Positions ..................................................................................................................................................... 24
5Installing Rectifier Modules and Initially Starting The System ......................................................................... 25
5.1 Installing the Rectifier Modules ....................................................................................................................................................................................................................25
5.2 Initially Starting, Configuring, and Checking System Operation....................................................................................................................................26
5.2.1 Initial Startup Preparation............................................................................................................................................................................................................26

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
iv
5.2.2 Initially Starting the System.......................................................................................................................................................................................................26
5.2.3 SCU+ Initialization...............................................................................................................................................................................................................................26
5.2.4 Verifying the Configuration File .............................................................................................................................................................................................28
5.2.5 Checking System Status...............................................................................................................................................................................................................28
5.2.6 Configuring the SCU+ Identification of Rectifier Modules............................................................................................................................28
5.2.7 SCU+ Alarm Relay Check ............................................................................................................................................................................................................29
5.2.8 Final Steps..................................................................................................................................................................................................................................................35
6Operating Procedures....................................................................................................................................................... 35
6.1 Rectifier Module ..........................................................................................................................................................................................................................................................35
6.2 SCU+ (Standard Control Unit Plus)..........................................................................................................................................................................................................35
7Maintenance.......................................................................................................................................................................... 35
7.1 System Maintenance Procedures...............................................................................................................................................................................................................35
8Troubleshooting and Repair ...........................................................................................................................................36
8.1 Contact Information................................................................................................................................................................................................................................................36
8.2 Supporting Documents ....................................................................................................................................................................................................................................... 36
8.3 Troubleshooting Information .........................................................................................................................................................................................................................36
8.3.1 General ......................................................................................................................................................................................................................................................... 36
8.4 Replacement Information.................................................................................................................................................................................................................................. 36
8.4.1 Replacement Assemblies............................................................................................................................................................................................................ 36
8.5 Replacement Procedures...................................................................................................................................................................................................................................37
8.5.1 Replacing a Rectifier Module....................................................................................................................................................................................................37
8.5.2 Clearing a Rectifier Communications Fail Alarm after Removing a Rectifier ..............................................................................37
8.5.3 Replacing a GMT Distribution Fuse ...................................................................................................................................................................................37
8.5.4 Distribution Unit Replacement ...............................................................................................................................................................................................37

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
v
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)

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
vi
Important Safety Instructions
Safety Admonishments Definitions
Definitions of the safety admonishments used in this document are listed under “Admonishments Used in this Document” on page v.
Safety and Regulatory Statements
Refer to Section 4154 (provided with your customer documentation) for Safety and Regulatory Statements.
Déclarations de Sécurité et de Réglementation
Reportez-vous à la Section 4154 (fourni avec les documents de votre client) pour les déclarations de sécurité et de réglementation.

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
1
1System Description
The Vertiv™ NetSure™ PLM80142 DC Power System is a complete integrated power system containing rectifiers, intelligent control,
metering, monitoring, and distribution. This power system consists of the following mounted in a 2RU high by 19” wide shelf.
•1000W Rectifier Modules
The shelf accommodates three (3) 1000W Rectifier Modules.
•The Rectifier Modules provide load power, battery float current, and battery recharge current during normal operating
conditions. The Rectifier Modules are designed to provide constant power. They are designed with the latest patented
switch-mode technology using DSP (Digital Signal Processing) functionality for efficient operation. This means that, within
the normal operating ambient temperature range and input voltage range, the maximum available output power is a constant
1000W. Within these ranges, the Rectifier Modules operate in one of three modes, depending upon load demands.
Transition between modes is completely automatic. If ambient temperature rises above or input voltage falls below
acceptable values, Rectifier Modules continue to operate but at derated output power levels.
1. Constant Voltage Mode: For any initial output voltage setting from 42 to 58 volts, output voltage remains constant
regardless of load. This is the normal operating condition, in which loads are being supplied and batteries are float
charged. Rectifier Modules operate in the Constant Voltage Mode unless load increases to the point where the product
of load current and output voltage is approximately 1000W.
2. Constant Power Mode: As load increases above approximately 1000W (non-adjustable), output current continues to
increase, but output voltage decreases as required to maintain constant output power. Rectifier Modules operate in the
Constant Power Mode unless load continues to increase to the point where the current limit setting is reached.
3. Constant Current Mode: If load increases above the current limit setting, output voltage decreases linearly to maintain
output current at current limit.
•SCU+ (Standard Control Unit Plus) Controller
The SCU+ Controller provides Rectifier Module and optional Low Voltage Battery Disconnect (LVBD) or Low Voltage Load
Disconnect (LVLD) control, metering functions, monitoring functions, and local/remote alarms. The SCU+ contains an LCD
display and keypad for local access. It provides connection for binary inputs, programmable relay outputs, and a charge
control function. The controller also supports rectifier temperature compensation if the system is equipped with a
temperature probe, and ambient air temperature monitoring if equipped with a second temperature probe. The SCU+ also
provides Ethernet connection and SNMP capability.
•Distribution Unit
The Distribution Unit consists of Low Voltage Battery Disconnect (LVBD), a battery shunt, two (2) bullet nose-type circuit
breaker load distribution positions, two (2) bullet nose-type circuit breaker battery disconnect positions, and five (5) GMT
fuse load distribution positions.
•AC Input Breaker
The shelf includes a front accessed 25A AC input circuit breaker which is internally connected to all rectifier module
positions.

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
2
1.1 Overview Illustration
DISTRIBUTION UNIT
(5) GMT Fuse Load Positions
(2) Bullet-Nose Circuit Breaker Load Positions
(2) Bullet-Nose Circuit Breaker Battery Disconnect Positions
Low Voltage Battery Disconnect (LVBD)
Distribution Unit
(2) 20A Load Distribution
Circuit Breaker
(2) 5A GMT Fuse (2) 60A Battery Disconnect
Circuit Breaker
SCU+ Controller
Rectifier Module
(1000W)
AC Input Breaker
Special Alarm Cable
Unterminated
AC Input Leads

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
3
1.2 Dimensions
Top View
Front View
Bottom View
Left Side View Right Side View
18.3
19.0
16.8 5
12
Notes:
1. All dimensions are in inches,
unless otherwise specified.
2. Weight in LBS.
Net: 30
Shipping:
3. Finish: Front Panels are Gray
Shelf is Galvaneal.
0.23
3.46
3.00
0.5
Rear View
1
12

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
4
1.3 Specifications
NOTE! For all rectifier specifications, refer to the separate Rectifier User Manual (UM1R481000). For all controller
specifications, refer to the Controller User Manual (UM1M521B). For factory settings of all configurable Controller parameters,
refer to the Configuration Drawing (C-drawing) supplied with your Power System.
Input Ratings
Input Voltage: Nominal 120 volts AC, single phase, 3-wire, 50/60 Hz, with an operating range of 100 to 132 volts. Acceptable input
frequency range is 45 to 65 Hz.
Input Current: 18.3A @ 120Vac.
Output Ratings
Output Voltage: -48 Volts DC.
Output Capacity: See the following table.
System DC Output Current @ 120Vac Input
+40°C (+104°F) +65°C (+149°F)
31.2A 18.9A
Environmental Ratings
Operating Ambient Temperature Range (Specification Compliant):
a) -40°C (-40°F) to +65°C (+149°F) with derating output.
b) -40°C (-40°F) to +40°C (+104°F) with full power performance.
Storage Ambient Temperature Range: -40°C (-40°F) to +75°C (+167°F).
Humidity: This Power System is capable of operating in an ambient relative humidity range of 0% to 90%, non-condensing.
Altitude: 2000 m (6560 ft) at full power (power limited for heights above 2000 m).
Mounting:
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 Craftspersons 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 to be connected to the common bonding network in a Network Telecommunication Facility (CO, vault,
hut, or other environmentally controlled electronic equipment enclosure).
19" wide rack (1” or 1 3/4” multiple drillings) mounting.
The right mounting angle is positioned for 5” front projection. The left mounting angle is positioned for 1” front projection.
Ventilation Requirements: Rectifier and mounting shelf ventilating openings must not be blocked and temperature of air entering
rectifiers must not exceed rated Operating Ambient Temperature Range stated above.

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
5
Compliance Information
Surge Protection: Compliance with EN61000-4-5 (2kV Line to Line, 2kV Line to Earth). Capable of withstanding surges per
ANSI/IEEE C 62.41 1980 Category B3 across the input terminals.
NOTE! This level of protection is a widely used standard for telecommunications power equipment. As with all such
equipment, it is the end user's responsibility to provide an adequately sized Surge Suppression Device at the commercial
power service entrance of the building that reduces all incoming surges to levels below the classes/categories stated for the
equipment.
EMC: Complies with the Low-Voltage Directive, 73/23/EEC. Complies with Emissions and Immunity requirements as specified in GR
1089 Core Issue 4.
EMC
Emissions Test Level
EN 55022: 1998
CFR 47 – Part 15
GR-1089 Issue 4
Conducted Class B
Radiated Class B
Immunity
GR-1089 Issue 4
EN 61000-4-2 Electrostatic Discharge 8kV / 15kV
EN 61000-4-4 Electric Fast Transients 0.25kV / 0.5kV
Radiated Immunity 8.5V/m
Conducted Immunity 89dBuA
Surge IEEE C62.41 2kV / 6kV
Standard Features
AC Input Connections: The shelf is equipped with unterminated AC input leads which are factory connected to the internal AC input
circuit breaker and all Rectifier Module mounting positions.
Battery Connections: Battery and battery return leads terminated in two-hole lugs are connected to threaded studs located inside
the Distribution Unit. Battery leads are brought into the right side (as viewed from the front) of the shelf.
Load Connections: Load distribution (circuit breakers, if furnished) and load return leads terminated in two-hole lugs are connected
to threaded studs located inside the Distribution Unit. Load leads are brought into the right side (as viewed from the front) of the
shelf and are accessible from the front of the shelf.
Load distribution (GMT fuses) and load return leads are connected to receptacles located inside the Distribution Unit. Load leads are
brought into the right side (as viewed from the front) of the shelf and are accessible from the front of the shelf.
Alarm and Monitoring Connections: Relay output and digital input leads are connected to screw-type terminal blocks located on the
Customer Interface Board located inside the shelf. A special alarm relay cable is provided. The leads of the special alarm cable enter
the right side (as viewed from the front) of the shelf and are accessible from the front of the shelf.
1.4 Items Ordered Separately
1.4.1 Rectifier Modules
Each shelf holds up to three (3) Rectifier Modules.
Rectifier Modules must be ordered separately by P/N 1R481000.

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
6
1.4.2 Load Lead Assembly for 10A GMT Fuse Positions
Each P/N 535206 provides one (1) GMT fuse load lead assembly.
Five (5) P/N 535206 are required per shelf.
Each P/N 535206 provides 12’ long, 16 AWG, load and load return leads that are terminated on one end with the appropriate mating
connector to plug into a single 10A GMT fuse connector on the Distribution Unit and are left un-terminated at the remaining end for
connection into customer loads.
1.4.3 GMT Load Distribution Fuses
The Distribution Unit holds up to five (5) 0-10A GMT load distribution fuses. See Table 1.1.
Table 1.1 GMT Fuses
Ampere Rating P/N Fuse Color
18/100 GMT-A 248610301 --
1/4 248610200 Violet
1/2 248610300 Red
3/4 248610500 Brown
1-1/3 248610700 White
2 248610800 Orange
3 248610900 Blue
5 248611000 Green
7-1/2 248611300 Black-White
10 248611200 Red-White
Replacement
Dummy Fuse 248872600 ---
Replacement Safety
Fuse Cover 102774 --

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
7
1.4.4 Bullet Nose-Type Battery Disconnect and Load Distribution Circuit Breakers
The Distribution Unit holds up to two (2) bullet nose-type battery disconnect circuit breakers and up to two (2) bullet nose-type load
distribution circuit breakers. See Table 1.2.
Table 1.2 Bullet Nose-Type Circuit Breakers
Ampere
Rating
P/N
Electrical Trip1
(White Handle)
Electrical/
Mechanical Trip2
(Black Handle)
1 102272 101596
3 102273 101597
5 102274 101598
10 102275 101599
15 102276 101600
20 102277 101601
25 102278 101602
30 102279 101603
35 102280 101604
40 102281 101605
45 121998 121997
50 102282 101606
60 102283 101607
70 102284 101608
75 102285 101609
80 121996 121995
100 102286 101610
See Table 4.4 for recommended wire sizes and lugs.
Circuit Breaker Alarm Operation:
¹ Provides an alarm during an electrical trip condition only.
² Provides an alarm during an electrical or manual trip condition.
Note that Electrical Trip only circuit breakers are not typically used for battery disconnect circuit breakers.
1.4.5 Temperature Probe
Two Temperature Probes can be connected to this system. One to provide Battery Charge Temperature Compensation and the
other to monitor ambient air temperature. Each probe plugs into the IB2 Board.
The Temperature Probe used for Battery Charge Temperature Compensation is mounted near the battery to sense battery ambient
temperature. This allows the Controller to automatically increase or decrease the output voltage of the system to maintain battery

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
8
float current as battery ambient temperature decreases or increases, respectively. Battery life can be extended when an optimum
charge voltage to the battery with respect to temperature is maintained.
Optional Temperature Probe, P/N 04118246 (shelf side half) and P/N 04118247 (probe side half, 9 ft.
long)
The Temperature Probe consists of two pieces that plug together to make a complete probe. When ordered, P/N 04118246 (3 feet
long) is pre-wired to the shelf and P/N 04118247 (9 feet long) is shipped loose. Total length: 12 ft.
Optional Temperature Probe, P/N 04118246 (shelf side half) and P/N 04116740 (probe side half, 30 ft.
long)
The Temperature Probe consists of two pieces that plug together to make a complete probe. When ordered, P/N 04118246 (3 feet
long) is pre-wired to the shelf and P/N 04116740 (30 feet long) is shipped loose. Total Length: 33 ft.

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
9
2Installation Acceptance Checklist
Provided below is an Installation Acceptance Checklist. This checklist helps ensure proper installation and initial operation of the
system. As the procedures presented in Sections “Installing the System” through Installing Rectifier Modules and Initially Starting The
System” of 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
Power/Distribution Shelf Secured to Equipment Cabinet
Fuses Installed
Circuit Breakers Installed
Making Electrical Connections
Power/Distribution Shelf Frame Grounding Connection Made
AC Input and AC Input Equipment Grounding Connections Made
External Interface Connections Made
Digital Inputs
Relay Outputs
Temperature Probes
Ethernet Connection Made (if required)
Load Connections Made
CO Ground Connection Made
Battery Connections Made
Installing Rectifier Modules and Initially Starting the System
Rectifier Modules Installed
System Started, Configured, and Checked

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
10
3Installing the System
3.1 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 Craftspersons 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 to be connected to the common bonding network in a Network Telecommunication Facility (CO,
vault, hut, or other environmentally controlled electronic equipment enclosure).
•The installer should be familiar with the installation requirements and techniques to be used in securing the
Power/Distribution Shelf to an equipment cabinet.
•Rectifier and mounting shelf ventilating openings must not be blocked and temperature of air entering rectifiers must not
exceed rated Operating Ambient Temperature Range found in System Description on page 1 under “Specifications”.
3.2 Securing the Power/Distribution Shelf to the Equipment Cabinet
The shelf is designed to be mounted in a standard 19” wide cabinet frame having 1” or 1 3/4” multiple drillings. Refer to “Dimensions”
under System Description for overall dimensions.
NOTE! Refer to the General Requirements section at the beginning of this document for Ventilation Requirements.
Procedure
1. Secure shelf mounting angles to equipment cabinet at two (2) locations per side. Use grounding washers at one (1) location
per side. Proper orientation of grounding washers enables teeth to dig into paint for a secure ground connection. Torque
connections to 70 in-lbs.
NOTE! Compliance with Telcordia GR-1089-CORE requires that prior to mounting the Power/Distribution Shelf 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.
3.3 Installing Circuit Breakers and Fuses
3.3.1 GMT Load Distribution Fuses
Restrictions
When used for power distribution, load should not exceed 80% of device rating, except 10 ampere fuses, for which load should not
exceed 70% of device rating.

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
11
Procedure
Refer to Figure 3.1.
1. Open the Distribution Unit’s front access panel.
2. Install correctly sized GMT fuses into the fuseholders located inside the Distribution Unit, as required. If a dummy fuse is
installed, first remove the dummy fuse. Install a safety fuse cover over each GMT fuse.
3. When finished, close the Distribution Unit’s front access panel.
Figure 3.1 Installing GMT Load Distribution Fuses
3.3.2 Bullet Nose-Type Battery Disconnect and Load Distribution Circuit Breakers
Procedure
Refer to Figure 3.2.
1. Open the Distribution Unit’s front access panel.
2. Install correctly sized bullet nose-type circuit breakers into the mounting positions located inside the Distribution Unit, as
required. Orient the circuit breaker with the ON position to the right. Ensure the alarm contact on the back of the circuit
breaker makes contact with the alarm terminal on the mounting circuit card.
3. When finished, close the Distribution Unit’s front access panel.
Front
GMT Fuses
and Safety Covers

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
12
Figure 3.2 Installing Bullet-Nose-Type Battery Disconnect and Load Distribution Circuit Breakers
4Making Electrical Connections
4.1 Important Safety Instructions
DANGER! Adhere to the “Important Safety Instructions” presented at the front of this document.
4.2 Wiring Considerations
All wiring and branch circuit protection should follow the current edition of the American National Standards Institute (ANSI)
approved National Fire Protection Association's (NPFA) National Electrical Code (NEC), and applicable local codes. For operation in
countries where the NEC is not recognized, follow applicable codes.
Refer to drawing 031110100 for lug crimping information. Refer to drawings 031110200 and 031110300 for additional lug information.
4.3 Power/Distribution Shelf Frame Grounding Connection
For shelf grounding requirements, refer to the current edition of the American National Standards Institute (ANSI) approved National
Fire Protection Association's (NPFA) National Electrical Code (NEC), applicable local codes, and your specific site requirements.
Procedure
1. The frame grounding connection to the shelf is made by using grounding washers with the mounting hardware used to
secure the shelf to the equipment cabinet. Refer to the procedure “Securing the Power/Distribution Shelf to the Equipment
Cabinet” under Installing the System. Ensure that the equipment cabinet is properly grounded.
ON
OFF Front
(2) 20A
Load Distribution
Circuit Breakers
(2) 60A
Battery Disconnect
Circuit Breakers
(2) 60A
Battery Disconnect
Circuit Breakers
(2) 20A
Load Distribution
Circuit Breakers

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
13
NOTE! The DC return connection to this system can remain isolated from system frame and chassis (DC-I).
4.4 AC Input and AC Input Equipment Grounding Connections
DANGER! Adhere to the “Important Safety Instructions” presented at the front of this document.
The shelf is equipped with unterminated AC input leads which are factory connected to the internal AC input circuit breaker and all
Rectifier Module mounting positions.
Recommended external AC input branch circuit protective device rating is 25A. The protective device should be of the time-delay or
high inrush type.
Procedure
1. Connect the AC input leads to a properly wired AC outlet or distribution box. Refer to Figure 4.1.
Figure 4.1 AC Input Connections
Unterminated 12 AWG
AC Input Leads
Connect to a properly wired AC outlet or distribution box.
Connect Black wire labeled /L/ to Line.
Connect Black wire labeled /N/ to Neutral.
Connect Green-Yellow wire to Ground.
Nominal 120VAC Input for all Rectifier Modules

Vertiv™ NetSure™ -48 VDC Power System Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
14
4.5 External Interface Connections
NOTE! A special alarm relay cable is furnished.
Digital inputs, relay outputs, and temperature probe(s) are connected to the Customer Interface (IB2) Board, which provides external
interface with the SCU+ Controller. Refer to Figure 4.2 for connector locations. Refer to Table 4.1 and Table 4.2 for pin-out
information.
If required to access these connection points, loosen the captive fastener on the front of the SCU+ Customer Interface Board, and
slide the board partially out of the shelf.
Procedure
Relay Outputs and Digital Inputs: Relay output and digital input leads are connected to screw-type terminal blocks located on the
Customer Interface (IB2) Board mounted inside the shelf. Connect digital inputs as required per Table 4.1. Connect the special alarm
relay cable per Table 4.1, Table 4.2, and Table 4.3. Recommended torque for the Digital Input and Relay Output terminal blocks is 2
in-lbs. Recommended Wire Size: 22 AWG for Loop Lengths Up to 200 ft., 18-20 AWG for Loop Lengths Over 200 ft.
4.5.1 Digital Inputs
•Connect up to eight (8) digital inputs to the Customer Interface (IB2) Board. Note that some of these inputs are factory
connected, as listed in Table 4.1.
•Observe proper polarity per Table 4.1. For example, if an alarm being connected to input No. 1 uses a BR+ signal, the alarm
lead must be connected on the + terminal of input 1 and a continuous 48V signal must be connected on the – terminal of
input 1. Inversely, if alarm No. 1 uses a 48V signal, the alarm lead must be connected on the – terminal of input 1 and a
continuous BR+ signal must be connected on the + terminal of input 1.
•The digital inputs can be configured to provide an alarm when the signal is applied (HIGH) or removed (LOW), as described
in the separate SCU+ User Manual.
4.5.2 Relay Outputs
•The Customer Interface (IB2) Board provides eight programmable alarm relays with Form-C contacts. Refer to Table 4.2 for
pin-out information.
NOTE! The relay assigned to “Major Summary” alarm (relay 1 by default) will operate in the “Fail Safe Mode”. “Fail Safe Mode”
means Relay 1 is de-energized during an alarm condition, opening the contacts between the C and NO terminals, and closing
the contacts between the C and NC terminals.
The remaining 7 relays energize during an alarm condition, closing the contacts between the C and NO terminals, and
opening the contacts between the C and NC terminals.
Temperature Probes: Up to two (2) temperature probes can be connected to the Customer Interface (IB2) Board. Refer to Figure
3.1. Each probe can be programmed to monitor ambient air temperature or battery temperature. A probe can also be designated to
be used for the battery charge temperature compensation feature.
•Each Temperature Probe consists of two pieces. One piece is factory installed to the shelf and the other is shipped loose.
Locate and install the shipped loose piece which consists of the Temperature Probe and mating connector to the piece
factory installed in the shelf. The Battery Temperature Probe should be mounted on the top or side of a battery cell, in a
convenient location, away from direct sources of heat or cold. To mount, peel the backing from the self-adhesive surface, and
affix the probe to a clean, dry surface.