Vertiv NetSure 4015 User manual

NetSure™ 4015
30kW 400V DC Power System
User Manual
Specification Number: 584000300
Model Number: 4015-X003
COMPONENT
SPEC. NO.
584000300
MODEL
INTEGRATED SYSTEM
LIST R3, R4
4015-X003
LOAD DISTRIBUTION SUB-RACK
HRMG Configuration (w/ row breaker)
HRMG Configuration (w/out row breaker)
LIST 25
LIST 27
--
POWER AND CONTROL SUB-RACK
HRMG Configuration
LIST 13
4015-X003
BATTERY TRAY
HRMG Configuration
LIST 93
--

Vertiv™ NetSure™ 4015 30kW 400V DC Power System User Manual
Vertiv™ NetSure™ 4015 30kW 400V DC Power System 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.

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TABLE OF CONTENTS
Admonishments Used in this Document.............................................................................................................................iv
Important Safety Instructions..................................................................................................................................................v
Safety Admonishments Definitions ..........................................................................................................................................................................................................................v
Safety and Regulatory Statements...........................................................................................................................................................................................................................v
Déclarations de Sécurité et de Réglementation...........................................................................................................................................................................................v
1Customer Documentation Package..................................................................................................................................1
2System Description ................................................................................................................................................................1
2.1 Power and Control Sub-Rack (List 13).......................................................................................................................................................................................................1
2.2 Load Distribution Sub-Rack(s) (List 25, 27)........................................................................................................................................................................................2
2.3 Battery Tray(s) (List 93) ........................................................................................................................................................................................................................................2
2.4 IT Rack Integration (List R3, R4)....................................................................................................................................................................................................................2
2.5 Available Grounding Configurations ...........................................................................................................................................................................................................2
3Operating Procedures..........................................................................................................................................................3
3.1 Controller and Rectifiers.........................................................................................................................................................................................................................................3
3.2 Local Controls and Indicators ...........................................................................................................................................................................................................................3
3.3 Lockout/Tagout (LOTO) .......................................................................................................................................................................................................................................3
3.4 Ground Fault (Insulation Fault) Detection Circuit Operation (HRMG Configurations)...............................................................................5
3.5 Adding or Replacing a DC Distribution Circuit Breaker............................................................................................................................................................5
4Maintenance.............................................................................................................................................................................8
4.1 Important Safety Instructions............................................................................................................................................................................................................................8
4.2 System Maintenance Procedures..................................................................................................................................................................................................................8
4.3 Recommended Battery Maintenance ........................................................................................................................................................................................................8
5Troubleshooting and Repair ..............................................................................................................................................9
5.1 Important Safety Instructions............................................................................................................................................................................................................................9
5.2 Contact Information....................................................................................................................................................................................................................................................9
5.3 Controller and Rectifiers.........................................................................................................................................................................................................................................9
5.4 ACU+ Controller Configuration........................................................................................................................................................................................................................9
5.5 System Troubleshooting Information .....................................................................................................................................................................................................10
5.6 Replacement Information .................................................................................................................................................................................................................................... 11
5.7 Replacement Procedures.................................................................................................................................................................................................................................... 11

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iv
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
Safety Admonishments Definitions
Definitions of the safety admonishments used in this document are listed under “Admonishments Used in this Document” on page iv.
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.

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Vertiv™ NetSure™ 4015 30kW 400V DC Power System User Manual
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1Customer Documentation Package
This document (UM584000300) provides Operation Instructions for Vertiv™ NetSure™ 4015 400V DC Power System Model
4015-X003, Spec. No. 584000300.
The complete Customer Documentation Package consists of…
Power System Installation Manual
•Power System Installation Instructions: IM584000300
Power System Operation Manual
•Power System Operation Instructions: UM584000300
•Rectifier Instructions: UM1R40015000e
•Power System “System Application Guide”: SAG584000300
Controller Operation Manual
•ACU+ Controller Operation Instructions: UM1M820NNB-1
USB Drive with All Customer Documentation
•Power System Installation Instructions: IM584000300
•Power System Operation Instructions: UM584000300
•Rectifier Instructions: UM1R40015000e
•Power System “System Application Guide”: SAG584000300
•ACU+ Controller Operation Instructions: UM1M820NNB-1
•Also provided on the USB drive is an ACU+ configuration drawing and the ACU+ configuration files loaded into the ACU+ as
shipped.
2System Description
400V DC Output @ up to 30kW Power System
The Vertiv™ NetSure™ 4015, 30kW 400V DC Power System is a complete integrated power system containing rectifiers, intelligent
control, metering, monitoring, and distribution. The individual system sub-racks can be factory integrated into a standard IT rack or
provided separately for customer integration into an existing IT rack.
This power system is capable of operating either with or without batteries online.
This system consists of the following components.
2.1 Power and Control Sub-Rack (List 13)
The system contains one (1) “power and control sub-rack”, which houses up to two (2) rectifiers and the system control and
monitoring components.

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Rectifier(s)
The system contains one (1) or two (2) rectifiers, which provide load power, battery float current, and battery recharge current during
normal operating conditions. Refer to the rectifier instructions (UM1R40015000e) for more information.
Controls
ACU+ (Advanced Control Unit Plus) Controller
The system controller provides power system control, rectifier control (including a charge control function), metering functions,
monitoring functions, and local/remote alarm functions. Power system control includes battery low voltage disconnect (BLVD)
functionality to remotely trip battery circuit breakers which protects batteries against over-discharge. The system can also be
equipped with one (1) or two (2) temperature probe(s). Any combination of the two (2) temperature probes can be programmed to
monitor ambient air temperature and/or battery temperature. A temperature probe set as a battery probe can also be designated to
be used for the rectifier battery charge temperature compensation feature.A temperature probe designated to be used for the
battery charge temperature compensation feature can also be used for controlling against battery thermal runaway (BTRM feature).
The controller also provides data acquisition, system alarm management, and advanced battery and energy management. The
controller contains an LCD display and keypad for local access. The controller provides Ethernet connection and supports software
upgrade via its USB port. It also comes with a comprehensive web page and SNMP capability for remote system management. Refer
to the ACU+ controller instructions (UM1M820NNB-1) for more information.
System Shutdown
A “System Shutdown” pushbutton is located on the front of the power and control sub-rack. When momentarily depressed, the
rectifier’s AC input circuit breakers and the provided battery trays’ battery disconnect circuit breakers are tripped open to isolate the
system from all electrical sources. Manual intervention is required to restart the system.
2.2 Load Distribution Sub-Rack(s) (List 25, 27)
The system may contain up to two (2) “load distribution sub-racks”, which provide DC distribution through circuit breakers. Optional
main row breaker available. Distribution can also be bulk with no “distribution sub-rack”.
2.3 Battery Tray(s) (List 93)
The system may contain up to five (5) battery trays, each housing one (1) 400V battery string consisting of twenty-eight (28) 12V
battery blocks (336V nominal). Customer supplied external battery strings can be connected to the system. The total number of
internal and external battery strings cannot exceed five (5).
2.4 IT Rack Integration (List R3, R4)
Choice of 24U or 42U rack and includes factory installation and integration of other components.
2.5 Available Grounding Configurations
HRMG (High Resistance Midpoint Ground) Configuration
(+/- 200V DC)
The HRMG configuration provides system voltages to ground at half of the output system voltage, for additional personnel safety.
That is, the HRMG version of 400V DC produces +/-200V DC to ground potentials. This configuration is used in applications where
an internal high resistance path is required between the positive output busbar and site ground and also the negative output busbar
and site ground.
The DC bus is continuously monitored for ground fault (insulation fault) conditions. If the insulation resistance between the +BUS or -
BUS to ground goes below a set value, a ground fault (insulation fault) alarm is generated.

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3Operating Procedures
3.1 Controller and Rectifiers
For operation instructions on these units, refer to the following documents.
•ACU+ Controller Operation Instructions (UM1M820NNB-1)
•Rectifier Instructions (UM1R40015000e)
3.2 Local Controls and Indicators
Refer to the controller and rectifier instructions for descriptions of the local controls and indicators located on these units.
Refer to this section for descriptions of the local controls and indicators located on the system’s sub-racks. Refer to Figure 3.1 for
location.
Power and Control Sub-Rack
“AC Input” Circuit Breaker: The AC input circuit breaker feeds both rectifier positions.
“System Shutdown” Pushbutton: When momentarily depressed, opens the rectifier’s AC input circuit breakers and the battery trays’
battery disconnect circuit breakers.
“Output Voltage Present” Indicator: Illuminates green to indicate voltage is present on the system’s DC output bus.
“PS1” Indicator: Illuminates green to indicate converter power supply #1 is functioning. (If off when system is in operation, contact
Vertiv Technical Support.) (This power supply provides 48V for controls.)
“PS2” Indicator: Illuminates green to indicate converter power supply #2 is functioning. (If off when system is in operation, contact
Vertiv Technical Support.) (Redundant 48V power supply for controls.)
“Ground Fault Alarm” Indicator:Illuminates red to indicate a ground fault (insulation fault) related alarm condition exists. (See
“Ground Fault (Insulation Fault) Detection Circuit Operation (HRMG Configurations)” on page 5.)
Load Distribution Sub-Rack
“Row Breaker” (if furnished):The distribution sub-rack’s row circuit breaker feeds the distribution circuit breakers located in the
distribution sub-rack.
Battery Tray
Battery Disconnect Circuit Breaker: Disconnects the battery tray from the system.
3.3 Lockout/Tagout (LOTO)
The “Row Breaker” (if furnished) on a load distribution sub-rack and the “Battery Disconnect Circuit Breaker” on a battery tray
contains a bracket which allows the circuit breaker to be padlocked in the off position.

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Figure 3.1 Controls and Indicators
Load Distribution Sub-Rack
Power and Control Sub-Rack
Rectifier #2Rectifier #1
AC Input Circuit Breaker
Battery Tray
Battery Tray
Front View
Battery Disconnect
Circuit Breaker
Battery Disconnect
Circuit Breaker
System
Shutdown
Pushbutton
Row Breaker
Breaker
Lockout/Tagout
Bracket
Breaker
Lockout/Tagout
Bracket
Output Voltage
Present Indicator
Ground Fault
Alarm Indicator
PS1 Indicator
PS2 Indicator
Breaker
Lockout/Tagout
Bracket

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3.4 Ground Fault (Insulation Fault) Detection Circuit Operation (HRMG
Configurations)
3.4.1 Overview
The ground fault (insulation fault) detection circuit in a High Resistance Mid-Point Ground (HRMG) configuration detects the
insulation condition of the positive and negative DC bus to ground.
If a ground fault (insulation fault) is detected, a local indicator illuminates (located on the front of the power and control sub-rack).
The ground fault (insulation fault) circuit also sends a signal to the ACU+ Controller which activates local and remote controller
alarms.
High Resistance Mid-Point Ground (HRMG) Configuration Benefits
•Continuous bus operation with a single pole ground fault (insulation fault).
However; it is important to locate and isolate any ground faults (insulation faults) that occur in order to preserve these benefits. The
voltages between the +Bus and –Bus will shift when an insulation breakdown occurs and benefits above will be negated. In the
extreme case, the voltage on an ungrounded pole may be elevated to 400V DC and present a safety hazard to personnel.
Ground Fault (Insulation Fault) Detection Alarms
The ground fault (insulation fault) detection circuit monitors for three different types of ground faults (insulation faults).
•Bus Voltage Imbalance:Bus to ground voltage imbalance. The voltage difference between the +Bus to ground and the –
Bus to ground is more than the “Voltage Imbalance Alarm Limit” parameter set in the ACU+ Controller. The default setting
for this parameter is 84V.
•Missing Ground: The HRMG grounding lead that exits the power and control sub-rack is not connected to ground.
•Ground Fault (Insulation Fault) Alarm:The resistance between the +Bus to ground OR the –Bus to ground is less than the
“Ground Fault (Insulation Fault) Alarm Limit” parameter set in the ACU+ Controller. The default setting for this parameter is
39.2K.
NOTE! The "Normal Operation Site" impedance to ground for both the positive and negative output to ground should be
determined. Set the Ground/Insulation setpoint below your site's impedance to ground value. See UM1M820NNB-1 for
instructions on how to set this parameter.
3.5 Adding or Replacing a DC Distribution Circuit Breaker
NOTE! Circuit breakers are mounted left to right.
Distribution circuit breakers are added or replaced by adding or replacing the complete factory wired circuit breaker assembly.
Procedure
Refer to Figure 3.2 as this procedure is being performed.
1. Place the distribution sub-rack’s ROW BREAKER (if furnished) to the OFF position. A lockout/tagout bracket is furnished to
allow the breaker to be locked in the OFF position. If a ROW BREAKER is not furnished, the system MUST be completely
powered down and isolated from all power sources (AC and battery).
DANGER! If a ROW BREAKER is not furnished, hazardous DC voltage (400V DC) is present behind the access cover being
removed in this procedure. The system MUST be completely powered down and isolated from all power sources (AC and
battery).

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2. Remove the distribution sub-rack’s top front cover to access the distribution circuit breaker mounting positions.
3. Remove the distribution sub-rack’s inside shield by sliding the front of the shield up then out of the distribution sub-rack.
4. Remove the distribution sub-rack’s blank distribution position cover from the distribution position to be populated. Save the
screws for installation of the circuit breaker.
5. Install the circuit breaker using the screws removed above. Ensure when the circuit breaker is in the OFF position, the handle
is in the down position.
6. HRMG (High Resistance Midpoint Ground) Configuration: Connect the circuit breaker leads to the distribution sub-rack’s
busbars located in the lower section of the distribution sub-rack. Use the hardware provided with the circuit breaker.
Connect the lead labeled positive (+) to the bottom busbar. Connect the lead labeled minus (-) to the top busbar. Torque to
84 in-lbs.
7. Loosen the right DIN-rail stop and slide it to the right.
8. Install the DIN-rail terminal blocks furnished with the circuit breaker to the distribution sub-rack’s DIN-rail. Place the top
edge of the terminal block onto the DIN-rail and rotate the terminal block down until the bottom of the terminal block snaps
into the DIN-rail. Install the black terminal block to the left and the red terminal block to the right.
9. Slide the DIN-rail stop to the edge of the terminal blocks just installed and secure by tightening the screw.
10. Slide the distribution sub-rack’s inside shield into place. Note that cutouts in the shield may have to be removed, as required.
11. Connect load wiring to the terminal blocks, observing proper polarity. See Figure 3.3.
12. Install the distribution sub-rack’s top front cover.
13. Place the distribution sub-rack’s ROW BREAKER to the ON position (if furnished) or restart the system if it was powered
down.
14. Ensure that there are no local or remote alarms active on the system.

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Figure 3.2 Adding or Replacing a DC Distribution Circuit Breaker
Distribution
Circuit Breakers
Removable Panel
Distribution
Blank Covers
Front
Distribution
Sub-Rack
Row Breaker
Breaker
Lockout/Tagout
Bracket
Front
to minus (-) busbar
(top busbar)
to positive (+) busbar
(bottom busbar)
Distribution Terminal Blocks
(HRMG Configuration)
Black
Terminal
Block
Red
Terminal
Block
to minus (-) busbar
(top busbar) to positive (+) busbar
(bottom busbar)
Rear
Distribution Terminal Blocks
(HRMG Configurations)
Black
Terminal
Block
Red
Terminal
Block
OBSERVE CORRECT
POLARITY.

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Figure 3.3 Connecting DC Load Distribution Leads
4Maintenance
Contact Vertiv for all of your maintenance needs.
4.1 Important Safety Instructions
DANGER! Adhere to the “Important Safety Instructions” presented at the front of this document. These procedures are only
to be performed by trained personnel.
4.2 System Maintenance Procedures
DANGER! The system MUST be completely powered down and isolated from all power sources (AC and battery) before any
maintenance procedure is performed, or use full PPE protection for arc flash.
It is recommended to perform the maintenance procedures listed in Table 4.1 every 12-months to ensure continual system operation.
4.3 Recommended Battery Maintenance
Lockout/Tagout (LOTO)
The “Battery Disconnect Circuit Breaker” on an battery tray contains a bracket which allows the circuit breaker to be padlocked in the
off position.
Maintenance
Inspect the batteries according to battery manufacturer’s instructions. Maintain records as required by the battery manufacturer to
maintain the battery warranty.
Typical battery life is expected to be 3-5 years (depending on conditions).
Distribution Terminal Blocks
(HRMG Configuration)
+
-
±200V DC
Field Connections to
External Customer Loads.
OBSERVE CORRECT POLARITY.
Black
Terminal
Block
Red
Terminal
Block

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Battery life is determined by a variety of factors, including the technology deployed, the charge/discharge cycle history, operating
temperature, peak current draw, etc. Battery health should be checked at regular intervals per battery manufacturer’s instructions. It
is recommended to verify battery string voltage (336V DC nominal) and individual battery block voltages (12V DC nominal). To verify
the health of individual battery blocks, it is recommended to isolate and disconnect the battery string from the system (via the battery
disconnect circuit breaker).
The ACU+ Controller contains a Battery Test feature to validate batteries. Refer to the ACU+ Controller Operation Instructions
(UM1M820NNB-1).
Table 4.1 Maintenance Procedures to be Performed at 12-Month Intervals
Check Procedure
Ventilation Openings Check ventilation openings for obstructions such as dust, papers, manuals, etc.
Grounding Connections
Inspect the HDU ground termination (if applicable), tightness of all lugs on the master
ground bar and equipment sub-racks, and low ohmic values to the facility ground per local
practice.
AC Input Connections Inspect the AC input mains terminations for proper temperature and/or torque values.
DC Load Connections Inspect the DC load breaker wiring for proper temperature and/or torque values.
Power and Control Sub-Rack DC Output
Connections
Inspect the output lead terminations in the power and control sub-rack for proper
temperature and/or torque values.
Battery Connections Inspect the battery lead terminations for proper temperature and/or torque values.
Power and Control Sub-Rack Battery
Connections
Inspect the battery lead terminations in the power and control sub-rack for proper
temperature and/or torque values.
5Troubleshooting and Repair
5.1 Important Safety Instructions
DANGER! Adhere to the “Important Safety Instructions” presented at the front of this document. These procedures are only
to be performed by trained personnel.
5.2 Contact Information
Refer to Section 4154 (provided with your customer documentation) for support contact information.
5.3 Controller and Rectifiers
For troubleshooting and repair instructions on these units, refer to the following documents.
•ACU+ Controller Operation Instructions (UM1M820NNB-1)
•Rectifier Instructions (UM1R40015000e)
5.4 ACU+ Controller Configuration
If any ACU+ Controller configuration settings were changed, refer to the ACU+ Operation Instructions (UM1M820NNB-1) and save a
copy of the configuration file. This file can be used to restore the ACU+ Controller settings, if required, at a later date.
•Note that provided on a USB drive furnished with the system is an ACU+ configuration drawing (C-drawing) and the ACU+
configuration files loaded into the ACU+ as shipped.

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5.5 System Troubleshooting Information
This system is designed for ease in troubleshooting and repair. The various indicators as described in “Operating Procedures” on
Page 3 and in the controller and rectifier instructions are designed to isolate failure to a specific component. Once the faulty
component has been identified, refer to “Replacement Information” on Page 11 and "Replacement Procedures" on Page 11.
Troubleshooting Alarm Conditions on the ACU+ Controller
The ACU+ Controller displays alarm conditions as listed in the Available Alarms section of the ACU+ Operation Instructions
(UM1M820NNB-1). Programmable external alarm relays are also available. Refer to the ACU+ Configuration Drawing (C-drawing)
furnished with your system for your alarm relay configurations.
The ACU+’s Active Alarm and Alarm History submenus allow the User to view alarm details. Refer to the ACU+ Operation
Instructions (UM1M820NNB-1) to access these menus.
Clearing a Rectifier Communications Fail Alarm after Removing a Rectifier
If a rectifier is removed from the system, a rectifier communications failure alarm is generated. If the rectifier will not be replaced, the
alarm can be cleared as described in the following local LCD interface procedure.
Procedure
1. With the Main screen displayed, press ENT to go to the Main Menu. Navigate to and select “Manual” (ENT).
2. If a password screen opens, a password must be entered to allow the User to make adjustments. If a password was
previously entered and has not yet timed out, skip this step and proceed to step 3). Otherwise, to enter a password, with the
cursor at the User Name field (default is “Admin”), press the down arrow key to move cursor down to the password line.
Press ENT. “0” is highlighted. Press the up arrow key once to change the “0” to”1” (default password is “1”), then press ENT
twice. (
Note: If you have been assigned a unique User Name and password, follow this procedure to enter these.)
3. With the Manual menu screen displayed, navigate to and select “Rectifier” (ENT) / “All Rect Ctrl” (ENT).
4. Navigate to “Clear Comm Fail”. Press ENT. “Yes” highlights.
5. Press ENT to select the operation. Press ENT again to confirm.
6. Return to the Main screen by repeatedly pressing ESC (escape).
Clearing a Rectifier Lost Alarm
If the ACU+ Controller resets while a rectifier communications fail alarm is active, the rectifier communications fail alarm is replace
with a rectifier lost alarm. The alarm can be cleared as described in the following local LCD interface procedure.
Procedure
1. With the Main screen displayed, press ENT to go to the Main Menu. Navigate to and select “Manual” (ENT).
2. If a password screen opens, a password must be entered to allow the User to make adjustments. If a password was
previously entered and has not yet timed out, skip this step and proceed to step 3). Otherwise, to enter a password, with the
cursor at the User Name field (default is “Admin”), press the down arrow key to move cursor down to the password line.
Press ENT. “0” is highlighted. Press the up arrow key once to change the “0” to”1” (default password is “1”), then press ENT
twice. (
Note: If you have been assigned a unique User Name and password, follow this procedure to enter these.)
3. With the Manual menu screen displayed, navigate to and select “Rectifier” (ENT) / “All Rect Ctrl” (ENT).
4. Navigate to “Clear Rect Lost”. Press ENT.“Clear” highlights.
5. Press ENT to select the operation. Press ENT again to confirm.
6. Return to the Main screen by repeatedly pressing ESC (escape).

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5.6 Replacement Information
User Replaceable Components
Refer to SAG584000300 (System Application Guide) for part numbers of User replaceable components.
When a trouble symptom is localized to a faulty rectifier, controller, or User replaceable circuit card; that particular component should
be replaced in its entirety. Other than a rectifier fan replacement, no attempt should be made to troubleshoot or repair an individual
rectifier, controller, or circuit card.
5.7 Replacement Procedures
DANGER! Adhere to the “Important Safety Instructions” presented at the front of this document. These procedures are only
to be performed by trained personnel.
Replacing a Rectifier or Rectifier Fan
Refer to the Rectifier Instructions (UM1R40015000e) for a rectifier replacement procedure and a rectifier fan replacement procedure.
Refer also to “System Troubleshooting Information” on Page 10.
The rectifier being replaced is assigned by the ACU+ the lowest available identification number. If desired, you can change the
identification number, see “Configuring the ACU+ Identification of Rectifiers” in the separate Power System Installation Instructions
(IM584000300).
Replacing the ACU+ Controller
Refer to the ACU+ Operation Instructions (UM1M820NNB-1) for a controller replacement procedure.
Replacing a DC Distribution Circuit Breaker
Replace distribution circuit breakers with the same type and rating. Refer to System Application Guide SAG584000300 for part
numbers.
Distribution circuit breakers are replaced by replacing the complete factory wired circuit breaker assembly. Refer to “Adding or
Replacing a DC Distribution Circuit Breaker” starting on page 5.
Replacing an AC Input Surge Suppressor
A tripped AC input surge suppressor is indicated by an alarm issued via the ACU+ controller and local indicator on the surge
suppressor module.
Refer to System Application Guide SAG584000300 for replacement part numbers.
Refer to Figure 5.1 as this procedure is being performed.
Procedure
DANGER! Hazardous AC voltage (380V/400V/480V AC) is present behind the access cover being removed in this
procedure. Ensure you do not touch the terminals on the AC input terminal block if AC power has not been removed from
the system.
1. Remove the left rear access cover from the power and control sub-rack.
2. Locate the tripped surge suppressor. The tripped surge suppressor will have a visible red indicator.
3. Gently pull the tripped surge suppressor from its holder.
4. Plug the replacement surge suppressor into the holder.
5. Replace the power and control sub-rack’s left rear access cover.

Vertiv™ NetSure™ 4015 30kW 400V DC Power System User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
12
6. Ensure that there are no local or remote alarms active on the system.
Figure 5.1 AC Surge Suppressor Replacement

Vertiv™ NetSure™ 4015 30kW 400V DC Power System User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
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