Vertiv C48/24-1500 User manual

DC/DC Converter Module
User Manual
Specification Number: 1C48241500
Model Number: C48/24-1500

Vertiv™ DC/DC Converter Module User Manual
Vertiv™ DC/DC Converter Module 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.
Visit https://www.vertiv.com/en-emea/support/ for additional assistance.
Visit https://www.vertiv.com/zh-CN/support/ for additional assistance.

Vertiv™ DC/DC Converter Module User Manual
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TABLE OF CONTENTS
Admonishments Used in this Document.............................................................................................................................iv
Important Safety Instructions..................................................................................................................................................v
Safety Admonishments Definitions ..........................................................................................................................................................................................................................v
General Safety ..............................................................................................................................................................................................................................................................................v
Voltages..............................................................................................................................................................................................................................................................................................v
Hazardous Voltage ..................................................................................................................................................................................................................................................................v
Handling Equipment Containing Static Sensitive Components....................................................................................................................................................v
Static Warning ..............................................................................................................................................................................vi
1Introduction...............................................................................................................................................................................1
1.1 Overview.................................................................................................................................................................................................................................................................................1
1.2 Specifications.....................................................................................................................................................................................................................................................................1
2Operation ..................................................................................................................................................................................5
2.1 Local Indicators ..............................................................................................................................................................................................................................................................5
2.2 Converter High Voltage Shutdown and Lockout Restart.......................................................................................................................................................5
2.3 Converter Current Limit..........................................................................................................................................................................................................................................5
2.4 Installing Converter Modules.............................................................................................................................................................................................................................6
3Troubleshooting and Repair ..............................................................................................................................................7
3.1 Troubleshooting.............................................................................................................................................................................................................................................................7
3.2 Replacement Procedures......................................................................................................................................................................................................................................8

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Admonishments Used in this Document
DANGER!
Warns of a hazard the reader will be exposed to that will likely result
in death or serious injury if not avoided. (ANSI, OSHA)
WARNING!
Warns of a potential hazard the reader may be exposed to that could
result in
death or serious injury if not avoided. This admonition is not used for situations that pose a
risk only to equipment, software, data, or service. (ANSI)
CAUTION!
Warns of a potential hazard the reader may be exposed to that could
result in minor or moderate injury if not avoided. (ANSI, OSHA) This admonition is not
used for situations that pose a risk only to equipment, data, or service, even if such use
appears to be permitted in some of the applicable standards. (OSHA)
ALERT!
Alerts the reader to an action that must be avoided in order to protect
equipment, software, data, or service. (ISO)
ALERT!
Alerts the reader to an action that must be performed in order to prevent
equipment damage, software corruption, data loss, or service interruption. (ISO)
FIRE SAFETY!
Informs the reader of fire safety information, reminders, precautions,
or policies, or of the locations of fire
-fighting and fire-safety equipment. (ISO)
SAFETY!
Informs the reader of general safety information, reminders, precautions, or
policies not related to a particular source of hazard or to fire safety. (ISO, ANSI, OSHA)

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Important Safety Instructions
Safety Admonishments Definitions
Definitions of the safety admonishments used in this document are listed under “Admonishments Used in this Document” on page iv.
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
DC Input Voltages
DANGER! This system operates from DC input voltage. Although the DC voltage is not hazardously high, the input power
can deliver large amounts of current.
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 converters 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.
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 under “Static Warning” on
page vi.

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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 static dissipative
surfaces such as conductive foam or ESD bag. 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.

Vertiv™ DC/DC Converter Module User Manual
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1
1Introduction
1.1 Overview
The Vertiv™ C48/24-1500 is a compact DC/DC converter which offers efficient power conversion. It operates from a nominal -48 VDC
source to provide nominal +24 VDC load power.
1.2 Specifications
1.2.1 DC Output Ratings
•Voltage: Nominal +24 volts DC, negative ground. Output voltage is adjustable from 24 to 28 volts DC via the associated
controller.
•Nameplate Rating: 24 to 28 VDC, 1500W.
•Regulation:
a) Output Voltage Tolerance: < ±0.2% when the load is 50% and the temperature is from +15 to +35°C; < ±0.5% when the
load is 50% and the temperature is from -5 to +55°C; < ±1% when the load is 50% and the temperature is from -20 to
+55°C.
b) Temperature Regulation: < ±0.02% when the load is 50% at -48 VDC and temperature range is from -10°C to +55°C.
c) Dynamic Response: The dynamic response time at rated input and output voltage is ≤ 200us and overshot ≤ 5% for load
changes at 50%-25%-50% and 50%-75%-50%.
d) The output voltage is accurate at half load. At half load, the error of output voltage is ≤ ±100mV. Static regulation will
give other voltage depending on load. The default value at half load is 27 VDC.
•Filtering:
a) Peak-peak voltage is ≤ 250mV at 1-100MHz and normal output voltage.
b) Psophemetic noise voltage is ≤ 2mV between 5-100% of the maximum load (output voltage > 24 VDC).
c) Wideband noise is < 20mV rms between 25HZ-20kHz (test according to ETS300132).
d) Output noise according to Telcordia GR-947-CORE: < 38 dBrnC (between 5-100% of the maximum load, output voltage >
24 VDC).
•Ripple Attenuation: Ripple attenuation is better than +24dB, input to output and f < 360Hz.
1.2.2 DC Input Ratings
•Voltage: Nominal -48 volts DC.
•Nameplate Rating: -41 to -58.5 VDC, 39.5A max.
•Inrush Current: The peak value of the inrush current does not exceed 2 times the maximum steady-state peak value.
•Input Regulation: ≤ ±0.1% when the load is 100% at -42 to -58.5 VDC input and temperature is +25°C.
•Temperature Coefficient: ≤ ±0.02%/°C over the specified operating temperature range.
•Typical Input Data: When equipped with one DC-DC converter.
a) See Table 1.1.

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b) Maximum Current: Input current is 39.5 amperes at -41.0 volts DC input and full load.
Table 1.1 Typical Input Data
Input
Voltage
Percent
of Full Load
Input Current
(Amps)
Efficiency
(%)
Typical Heat
Dissipation
(BTU/Hr)
42 VDC
0 0.125 -- 18.02
25 9.388 95.661 58.28
50
18.803
95.416
122.84
75
28.714
94.217
235.77
100
38.888
92.835
394.06
48 VDC
0
0.122
--
20.02
25
8.218
95.516
60.33
50
16.431
95.336
125.12
75 25.055 94.181 237.34
100 33.887 92.800 396.04
58 VDC
0 0.105 -- 20.93
25
6.811
95.286
63.55
50
13.601
95.141
130.57
75
20.713
94.049
243.05
100
27.987
92.689
402.69
NOTE! The output voltage of the DC-DC converter is initially adjusted to 24 volts DC at 50% load and 48 volts DC input.
1.2.3 Environmental Ratings
•Operation Temperature Range: -40°C to +80°C (-40°F to +176°F), -20°C to +55°C (-4°F to +131°F) with full performance.
•Storage Ambient Temperature Range: -40°C to +70°C (-40°F to +158°F).
•Humidity: This converter is capable of operating in an ambient relative humidity range of 0 to 90%, non-condensing.
•Altitude: The maximum operating ambient temperature should be derated by 3°C per 1000 feet at an elevation of 6,000 feet.
•Ventilation Requirements: The converter is fan cooled and utilizes front to back forced ventilation.
•Audible Noise: With a single converter installed and operating, the audible noise measured in front of converter at a 0.6m
distance from a horizontal line from the middle of converter does not exceed 50 dBA with a temperature of 25°C.
•Over Voltage Category: II.
•Power Distribution System: TN/TT/IT.
NOTE! The converter is recommended to be used in an environment with Pollution of Degree 2 or less.Pollution Degree 2
applies where there is only non-conductive pollution that might temporarily become conductive due to occasional
condensation (such as the office environment).
1.2.4 Compliance Information
•Safety Compliance: This unit meets the requirements of UL 60950-1, Standard for Information Technology Equipment, and is
UL Recognized as a power supply for use in Telephone, Electronic Data Processing or Information Processing Equipment.

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•EMC: This unit meets EN300 386 V1.51, Class A, other than Telecom centers.
•EFT: This unit meets EN61000-4-4, EFT will be fulfilled for DC terminals at 4KV (CM) with criteria B and signal line at 1KV
(CM) with criteria B.
•ESD: This unit meets EN61000-4-2; requirements are 6KV contact and 8KV air for criteria B and 8KV/15KV for criteria C.
•Radiated Electrical Fields: This unit meets EN61000-4-3. 10V/m in the frequency range 80MHZ-1GHz and 1.4-2GHz with
criteria A will be fulfilled.
•Power Frequency Magnetic Field: This unit meets EN61000-4-8. 30A/m magnetic field at 50Hz will be fulfilled for criteria A.
•Radiated Emission: For electrical field, meets EN55022 Class A between 150KHZ-30MHZ. For a standalone converter the
levels are 6db below the class A limits.
•Climatic Environment:
a) Transportation: Meets ETS 300 019-1-2, Class 2.3.
b) Storage and Handling: Meets ETS 300 019-1-1, Class 1.2.
c) Operation: Meets ETS 300 019-1-3, Class3.2.
d) Transportation, Storage and Handling, Operation: Meets Telcordia GR-63-Core, Chapter 4.
•GR-3108 Class 2 Compliant
1.2.5 Standard Features
•Type of Power Conversion Circuit: High Frequency.
•Input Voltage Protection:
a) Fusing: A non-user replaceable fuse is located in the positive input lead of each DC-DC converter.
b) High and Low Input Voltage Inhibit: The converter shuts down at low or high input voltage.
1. Low Voltage Disable Point: -40.0 VDC ±0.5 VDC; hysteretic at least 3 VDC for restart.
2. High Voltage Disable Point: 59.5 VDC ±0.5 VDC; hysteretic at least 2 VDC for start.
•Output Protection:
a) Overvoltage Protection: When output voltage goes above a preset value (30.5±0.5V, not to exceed 31V for more than
150ms), the converter shuts down. Software settable HVSD level (from controller) 27V-30V.
b) Power Limit: Output power is limited to 1500W.
c) Over Temperature Protection: The operation of a DC-DC converter will automatically shut down and lock out if the
internal temperature of the module exceeds a predetermined value. Operation will automatically resume after the over-
temperature condition is corrected.
•Series Paralleling Output FET: A series paralleling output FET is provided in each DC-DC converter. This allows the modules
to be paralleled for redundancy.
•Hot Swappable: The converter is designed to be plug-and-play. The converter can be inserted or removed from a live DC
power system with no damage. When the converter is plugged into the system, the sub-system output voltage will not be
affected.

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•Cooling: Each converter contains a fan for forced convection cooling.
a) Fan Fault Protection: The converter shuts down and its alarm indicator (red) flashes if the fan fails. Fan failure is
detected and reported to controller. The fan is not field replaceable.
b) Fan Control: Fan speed is continuously variable. When input voltage is within normal range, the built-in processor
adjusts fan speed according to the converter’s output power. For example, a higher output power increases the fan
speed.
•Communication Failure: The protection indicator (yellow) will flash should communication between the converter and
associated system controller fail. The failure information will be reported to the associated system controller and the
controller will process the failure accordingly. During a communication failure, the converter output voltage will automatically
adjust to 24.00 VDC. The converter will revert to normal operation once normal communication is restored.
•Monitoring Function: The converter has a built-in advanced DSP (Digital Signal Processor) that monitors and controls the
operation of the converter. The DSP also communicates with the associated system controller in real time through the CAN
bus. Table 1.2 lists the different commands and information exchanged between the converter and the controller.
•External Alarm: Provided via the associated controller. Refer to the separate Power System documentation for a description
of available external alarms.
Table 1.2 Monitoring Function
Commands / signals that can be received
by the Converter Module from the
Controller.
Information gathered by the Controller from the
Converter Module.
•Turn On/Off
•HVSD Reset
•Current Limit Adjustment
•Voltage Adjustment
•Fan Speed Control Enable/Disable
•HVSD Threshold
•Output Voltage
•Output Current
•Current Limit Setting
•Temperature
•Over Voltage Setting
•On/Off Status
•Fault Alarms, such as:
HVSD
Fan Fail
•EEPROM Failure
•Protection Alarms, such as:
Input Voltage Protection
High Temperature Protection
•Thermal Derating
•Address
•Code
•Date
•Software Version
•Hardware Version
•
Imbalance Output Current
1.2.6 Mechanical Specifications
•Weight: 1.13kg (2.49 lbs).
•Dimensions (H x W x D): 1.65” (42mm) x 3.33” (84.5mm) x 10.2” (260mm).
•Local Controls: None.