ROOTECH ACCURA 2500 User manual

U
ser Guide [English]
R
evision 1.60 March 8, 2023
Energy Solution for
Human & Nature
ACCURA
Smart DC Distribution Panel Digital Power
Meter/Power Measuring Module
Provide the Best Multi-functional Smart Device Solution
2500/2550[DC]
(
UL Certification Process Underway)

Smart Distribution Panel Digital Power Meter
Main Distribution Panel Module
Accura 2500M Front Accura 2500M Rear
Main Distribution Panel Module + Main Distribution Panel
HMI Module
Main Distribution Panel Module with Voltage Divider
Accura 2500D/2500M Front Accura 2500M-VD Front
Main Distribution Panel HMI Module
Accura 2500D Front Accura 2500D Rear

DC Power Measuring Module DC Power Measuring Module DC Terminal Block
Accura 2550CMD-1P-250A TM-CM-1P-105
Accura 2550CMD-1P-1500A Accura 2550CMD-1P-125A TM-CM-1P-60
Accura 2550CMD-1P-100A TM-CM-1P-50L
Accura 2550CMD-1P-750A Accura 2550CMD-1P-60A TM-CM-1P-50

DC Power Measuring Meter
Accura 2550DCM-500V-80A Accura 2550DCM-50V-80A
Special-purpose Modules
Accura 2550TEMP Accura TSEN
Accura 2550GW

Accura 2500/2550 User Guide [DC] Notice
ⓒ2019 Rootech Inc. All Rights Reserved Page 5
Notice
Symbols
Caution
Indicates the presence of dangerous voltage which can cause severe injury or death if
proper precautions are not followed.
Caution
Alerts users of the presence of hazards which can cause injury to persons, property damage
or damage to the device if proper precautions are not followed.
Note
Indicates major instructions for the installation, operation, and maintenance of the product.
Indicates alternative voltage or current.
Indicates direct voltage or current.
Installation Considerations
The installation, operation, and maintenance of the product should be performed only by qualified,
competent personnel that have received appropriate training for high voltage and current devices.
Caution
If hazardous voltages are mishandled while installing and operating the product in the field, it can cause
serious injury or death.
This device must be installed and serviced only by qualified personnel who have in-depth knowledge of
installing, commissioning and operating the device and have had appropriate training. He or she should
have read and understood the various safety measures and warnings stated in the instructions.
Before carrying out any work on the device, switch off the power supply to the device.
Always use an appropriate voltage detection device to confirm the absence of voltage.
Always power the device with the correct rated voltage.
Install the device in a suitable electrical cabinet by following recommended installation instructions.
Failure to take these precautions could cause serious injuries or death.

Notice Accura 2500/2550 User Guide [DC]
Page 6 ⓒ2019 Rootech Inc. All Rights Reserved
Caution
Observe the following instructions, or permanent damage may occur to the product.
To ensure that the device operates correctly, make sure that:
The device is correctly installed.
The auxiliary power supply voltage indicated on the product is observed: AC 100 – 240 V, DC 100 –
300 V
About the Manual
Rootech Inc. reserves the right to make changes in the device specifications shown in this User Guide without
notice. Therefore, we recommend that customers should check the latest information on specifications of
the device before making orders.
In the absence of written agreements, Rootech Inc. assumes no liability for assistance with product
applications and the system design created by customers or legal issues, including infringement of
intellectual property arising from the use of modules described herein by third-parties.
We are committed to providing accurate information in this document. However, we assume no responsibility
for any errors in the document and reserves the right to make changes without notice.
Limitation of Liability
Where applicable law allows and does not prohibit or restrict such limitation, Rootech, Inc’s liability for this
product shall be limited to the amount actually paid by customers for the product.

Accura 2500/2550 User Guide [DC] Warranty
ⓒ2019 Rootech Inc. All Rights Reserved Page 7
Warranty
Rootech Inc. provides warrants for two years from the product receipt date only to the original purchaser of
the products and software that are sold or licensed by the company.
To obtain warranty service, the purchased products should be free from serious defects in material and
workmanship.
The software is provided in an up-to-date version, thus we do not offer any warranty for the software
product.
In order to make a product claim under the warranties described above, the original purchaser should
immediately contact Rootech headquarters. Upon receiving claims, Rootech will check out the product either
at where the purchaser is or at the company after receiving the product from the customer, who is
responsible for the cost of shipping the product. After inspecting the product, we will provide repair or
replacement services for the product.
Rootech will decide at its discretion whether to repair or replace it or give a refund for the product for when
the warranty period for the product expired or issues related to the product are not applicable for warranty
terms and conditions.
Limitation of Warranty
The Warranty does not apply to uninterrupted or error-free operation of the product or cover normal wear
and tear of the product or costs caused by the removal, installation, or troubleshooting of the customer's
electrical systems.
Defects caused by any of the following factors are not covered under the warranty.
Improper use(alteration, accident, misuse, abuse) or failure to act in accordance with installation,
operation or maintenance instructions
Unauthorized modifications, changes or repair attempts
Failure to comply with applicable safety standards & regulations
Damages resulting from transporting or storing the product
Damages caused by the force majeure event, including fire, flood, earthquakes, storm damage,
overvoltage & lightning
If the original identification marks(trade-mark, serial number, etc.) have been defaced, altered, or
removed

Warranty Accura 2500/2550 User Guide [DC]
Page 8 ⓒ2019 Rootech Inc. All Rights Reserved
Rootech shall not be liable for any other claims except the claims made by customers, including the original
purchaser, his employees, agents, or contractors for any loss, damage, or expense incurred related to the
purchased product when the above warranty terms and conditions are not fulfilled.
Any technical assistance provided by Rootech's personnel or representatives in system design shall be
deemed to be a suggestion. The original purchaser is responsible for determining the feasibility of such
suggestions and should conduct tests to prove their feasibility
It is the original purchaser’s responsibility to determine the suitability of any product and associated
documentation. The original purchaser should acknowledge that 100% uptime is not guaranteed because
of possible hardware or software defects. The original purchaser should also recognize that such defects and
failures may cause inaccuracies or malfunctions.
No agency, corporate entity, or employee of Rootech or other companies has authority to amend, modify
or extend the terms and conditions of this warranty in any way without express written authorization from
Rootech, Inc.
Standards Compliance
Energy-usage Monitor
E522977 (Certification Process Underway)
R-R-RTE-Accura2500

Accura 2500/2550 User Guide [DC] Revision History
ⓒ2019 Rootech Inc. All Rights Reserved Page 9
Revision History
The revision history of Accura 2500/2550 User Guide[DC] is as follows.
Revision Date Description
Revision 1.00 March 20, 2020 First issue
Revision 1.10 October 14, 2020 Updated content related to events
Modified content about accuracy
Revision 1.20 December 3, 2020 Added the Appendix B Module Connection
Changed description of accuracy
Added content on the start event of power quality events
Revision 1.21 January 8, 2021 Changed errors in set values for the aggregation of the Max/Min
values.
Revision 1.30 June 14, 2021 Divided the product manual into the AC and DC versions of Accura
2550CM module
Changed the name of Accura 2550CMD module for DC current
measurement
Added Accura 2550DCM module for DC voltage and current
measurement
Modified content on custom events
Added Accura 2550CMD-1P-750A model
Changed the maximum current value of Accura 2550CMD module
(170% -> 120%)
Changed the type of the internal communication cable for the
display module
Added the Locale item to system setup items
Revision 1.31 September 10, 2021 Added the Accura 2500M/Voltage Divider device for high DC voltage
measurement
Revision 1.40 March 30, 2022 Modified content on module connection
Added special-purpose modules
Added Accura 2550CMD-1P-1500A model
Changed content on event settings
Added the unipolar connection mode
Added content on standards, as well as the network setup parameter
Updated the setup section of Accura 2550DCM meter
Revision 1.41 July 18, 2022 Updated data on the product certifications
Revision 1.50 December 12, 2022 Changed the maximum measuring range of Accura 2550DCM-50V
module to 60 V
Revision 1.60 March 8, 2023 Changed the maximum measuring range of Accura 2550CMD-1P-
1500A module to 2,200 A
Changed the dimensions, components, and installation method for
Accura 2550CMD-1P-1500A module

Contents Accura 2500/2550 User Guide [DC]
Page 10 ⓒ2019 Rootech Inc. All Rights Reserved
Contents
Chapter 1
Product Introduction ..................................................................................................................................... 18
Overview ..................................................................................................................................................................................................................18
Product Information ...........................................................................................................................................................................................20
Smart DC Distribution Panel Digital Power Meter .....................................................................................................................20
Special-purpose Module.........................................................................................................................................................................21
Installation Example ..................................................................................................................................................................................22
Product Features.........................................................................................................................................................................................24
Chapter 2 Installation.......................................................................................................................................................28
Conditions for Installation...............................................................................................................................................................................28
Before Installation................................................................................................................................................................................................29
Product Appearance .................................................................................................................................................................................29
Components .................................................................................................................................................................................................34
Dimensions....................................................................................................................................................................................................38
Installation Example ..................................................................................................................................................................................43
Step 1: Panel Mounting ....................................................................................................................................................................................44
Mounting Accura 2500D on the Panel ............................................................................................................................................44
Mounting Accura 2500M on the Panel ...........................................................................................................................................45
Mounting Accura 2550CMD on the Panel.....................................................................................................................................48
Installation of Accura 2550DCM .........................................................................................................................................................53
Step 2: Wiring Accura 2500M Module......................................................................................................................................................54
Voltage Wiring of Accura 2500M .......................................................................................................................................................54
Voltage Wiring of Accura 2500M-VD...............................................................................................................................................57
Control Power Supply /Ground Wiring............................................................................................................................................59
Step 3: Connecting Accura 2500M with 2500D via the Communication Cable....................................................................61
Step 4A: Current Wiring of Accura 2550CMD Module......................................................................................................................63
Direct Connection to Accura 2550CMD-1P Module.................................................................................................................63
Through-hole Wiring of Accura 2550CMD-1P Module...........................................................................................................65
Step 4B: Voltage/Current Wiring of Accura 2550DCM......................................................................................................................66
Step 5: Connecting Accura 2500M with 2550 Modules ...................................................................................................................67
Step 6: Connecting Accura 2500M Modules for External Communication .............................................................................69
Ethernet Communication........................................................................................................................................................................69
RS-485 Communication ..........................................................................................................................................................................71
Chapter 3 Accura 2500M.................................................................................................................................................72
Device Composition ...........................................................................................................................................................................................72
Control Power Supply...............................................................................................................................................................................73
Voltage Terminal Block ............................................................................................................................................................................74
Ethernet Port for External Communication....................................................................................................................................76

Accura 2500/2550 User Guide [DC] Contents
ⓒ2019 Rootech Inc. All Rights Reserved Page 11
RS-485 Port for External Communication.......................................................................................................................................78
Communication Port for Connection with the HMI DISPLAY Module .............................................................................79
Communication Ports for Connection with Accura 2550 Modules....................................................................................80
LED Status Indicators................................................................................................................................................................................81
Functions..................................................................................................................................................................................................................82
External Communication with the Host System..........................................................................................................................82
Measurements..............................................................................................................................................................................................82
Power Quality...............................................................................................................................................................................................83
Events...............................................................................................................................................................................................................83
Controls of Accura 2550 Modules......................................................................................................................................................85
Accura 2500D Interface...........................................................................................................................................................................85
Chapter 4 Accura 2500D.................................................................................................................................................. 86
Device Composition ...........................................................................................................................................................................................86
Connection..............................................................................................................................................................................................................88
DISPLAY (HOME) Mode....................................................................................................................................................................................89
Screen Composition..................................................................................................................................................................................89
Display Screen of Accura 2550CMD Module................................................................................................................................90
Display Screen of Accura 2550DCM Meter ...................................................................................................................................94
SETUP Mode ..........................................................................................................................................................................................................95
Screen Composition..................................................................................................................................................................................95
Accura 2500M Setup ................................................................................................................................................................................95
Accura 2550CMD Setup....................................................................................................................................................................... 102
Accura 2550DCM Setup....................................................................................................................................................................... 105
EVENT Mode....................................................................................................................................................................................................... 109
Screen Composition............................................................................................................................................................................... 109
Measurement Events ............................................................................................................................................................................. 110
Power Quality Events............................................................................................................................................................................. 111
SYSTEM Events.......................................................................................................................................................................................... 112
Necessary Steps for Device Setup............................................................................................................................................................ 113
Step 1: Setup for the Measured Voltage Type of Accura 2500M.................................................................................... 113
Step 2: Voltage Wiring and Reference Voltage Setup of Accura 2500M ..................................................................... 113
Step 3: Module ID Setup of Accura 2550 Modules................................................................................................................ 113
Step 4: Ethernet Setup of Accura 2500M .................................................................................................................................... 113
Chapter 5 Accura 2550...................................................................................................................................................114
Operation Mode ...................................................................................................................................................................................... 114
Button Operation..................................................................................................................................................................................... 114
Accura 2550CMD.............................................................................................................................................................................................. 115
Applied Models........................................................................................................................................................................................ 115
LCD Display ................................................................................................................................................................................................ 115
Display Mode ............................................................................................................................................................................................ 116

Contents Accura 2500/2550 User Guide [DC]
Page 12 ⓒ2019 Rootech Inc. All Rights Reserved
Setup Mode ............................................................................................................................................................................................... 117
Accura 2550DCM.............................................................................................................................................................................................. 120
Applied Models........................................................................................................................................................................................ 120
LCD Display ................................................................................................................................................................................................ 120
Display Mode ............................................................................................................................................................................................ 121
Setup Mode ............................................................................................................................................................................................... 122
Chapter 6 Functions.........................................................................................................................................................125
Voltage/Current Sampling............................................................................................................................................................................ 125
Voltage Sensing........................................................................................................................................................................................ 125
Current Sensing........................................................................................................................................................................................ 125
Voltage and Current Sensing of Accura 2550DCM................................................................................................................. 126
Measuring Time ....................................................................................................................................................................................... 126
Calculation Per Subframe .................................................................................................................................................................... 126
Measurements.................................................................................................................................................................................................... 127
Measurement Parameters.................................................................................................................................................................... 127
Voltage Wiring.......................................................................................................................................................................................... 128
Power............................................................................................................................................................................................................. 133
Energy........................................................................................................................................................................................................... 133
Capacitance Estimation......................................................................................................................................................................... 134
Events ..................................................................................................................................................................................................................... 136
Power Quality Events............................................................................................................................................................................. 136
Measurement Events ............................................................................................................................................................................. 137
System Events ........................................................................................................................................................................................... 140
Providing Event Notifications and Resetting Notification Settings................................................................................. 140
Aggregation......................................................................................................................................................................................................... 142
Fixed Aggregation................................................................................................................................................................................... 142
Custom Aggregation ............................................................................................................................................................................. 143
Collection of Aggregated Data......................................................................................................................................................... 143
Appendix A Specifications.............................................................................................................................................144
General Specifications........................................................................................................................................................................... 144
Accura 2500M Main Distribution Panel Module...................................................................................................................... 144
Accura 2500D Main Distribution Panel HMI Module ............................................................................................................ 147
Accura 2550CMD-1P DC Power Measuring Module.............................................................................................................. 148
Accura 2550DCM DC Power Measuring Meter ........................................................................................................................ 150
Appendix B Module Connection ..................................................................................................................................152
Limitation in the Length of the Communication Cable due to Voltage Drops......................................................... 152
Limitation in the Number of Connectable Modules due to Power Consumption .................................................. 153
Limitation in the Number of Connectable Modules in a Single Group........................................................................ 153
Connecting Modules in Two Groups ............................................................................................................................................. 155

Accura 2500/2550 User Guide [DC] Contents
ⓒ2019 Rootech Inc. All Rights Reserved Page 13
Appendix C Standards .....................................................................................................................................................156
Appendix D Accuracy/Reliability ..................................................................................................................................157
Accuracy....................................................................................................................................................................................................... 157
Reliability ..................................................................................................................................................................................................... 158
Appendix E Ordering Information ...............................................................................................................................159
Accura 2500/2550 Smart DC Distribution Panel Digital Power Meter .......................................................................... 159
Special-purpose Modules.................................................................................................................................................................... 159

Figures Accura 2500/2550 User Guide [DC]
Page 14 ⓒ2019 Rootech Inc. All Rights Reserved
Figures
Fig 1.1 Identical Lengths of Accura 2550CMD and MCCBs with Various Ratings ....................................................... 19
Fig 1.2 Through-hole type Current Sensing Structure of Accura 2550CMD .................................................................. 19
Fig 1.3 Combined Installation of Accura 2500D and 2500M................................................................................................. 22
Fig 1.4 Connection of Accura 2500D and 2500M using Communication Cables........................................................ 23
Fig 2.1 Accura 2500M Front................................................................................................................................................................... 29
Fig 2.2 Accura 2500M Side..................................................................................................................................................................... 29
Fig 2.3 Accura 2500M Rear .................................................................................................................................................................... 29
Fig 2.5 Accura 2500M-VD Side............................................................................................................................................................. 30
Fig 2.6 Accura 2500M-VD Rear ............................................................................................................................................................ 30
Fig 2.7 Accura 2500D Front.................................................................................................................................................................... 31
Fig 2.8 Accura 2500D Side...................................................................................................................................................................... 31
Fig 2.9 Accura 2500D Rear ..................................................................................................................................................................... 31
Fig 2.10 Accura 2550CMD ...................................................................................................................................................................... 32
Fig 2.11 Accura 2550DCM ...................................................................................................................................................................... 33
Fig 2.12 TM-CM-1P-105........................................................................................................................................................................... 33
Fig 2.13 TM- CM-1P-60/50L/50 ........................................................................................................................................................... 33
Fig 2.15 Accura 2500M-VD Components........................................................................................................................................ 34
Fig 2.16 Accura 2500D Components ................................................................................................................................................. 35
Fig 2.17 Components of Accura 2550CMD-1P-1500A Model............................................................................................... 35
Fig 2.18 Components of Accura 2550CMD-1P-750A Model ................................................................................................. 36
Fig 2.19 Components of Accura 2550CMD-1P-250A Model ................................................................................................. 36
Fig 2.20 Components of Accura 2550CMD-1P-125A/100A/60A Model........................................................................... 36
Fig 2.21 Accura 2550DCM Components.......................................................................................................................................... 37
Fig 2.22 Components of TM-CM-1P-105 Terminal Block ........................................................................................................ 37
Fig 2.23 Components of TM-CM-1P-60/50L/50 Terminal Block........................................................................................... 37
Fig 2.24 Accura 2500D/2500M Dimensions ................................................................................................................................... 39
Fig 2.25 Accura 2500D Dimensions.................................................................................................................................................... 39
Fig 2.26 Accura 2550CMD-1P Dimensions ..................................................................................................................................... 40
Fig 2.27 Accura 2550DCM Dimensions ............................................................................................................................................ 41
Fig 2.28 TM-CM-1P Dimensions .......................................................................................................................................................... 42
Fig 2.29 Installation Diagram of Accura 2500M/ 2500D/ 2550CMD Modules.............................................................. 43
Fig 2.30 Mounting Accura 2500D on the Panel........................................................................................................................... 44
Fig 2.31 Mounting Accura 2500M on the Panel .......................................................................................................................... 45
Fig 2.32 Mounting Accura 2500M-VD on the Panel.................................................................................................................. 46
Fig 2.33 Combined Installation of Accura 2500M and 2500D .............................................................................................. 47
Fig 2.34 Mounting Accura 2550CMD on the Panel.................................................................................................................... 48
Fig 2.35 Installing Accura 2550CMD-1P-1500A............................................................................................................................ 49
Fig 2.36 Installing Accura 2550CMD-1P-750A through Mounting Holes (Mounting Plate/Busbar)................... 50

Accura 2500/2550 User Guide [DC] Figures
ⓒ2019 Rootech Inc. All Rights Reserved Page 15
Fig 2.37 Installling Accura 2550CMD-1P through Mounting Holes (Mounting Plate/Terminal Block) .............. 50
Fig 2.38 Panel Mounting.......................................................................................................................................................................... 53
Fig 2.39 DIN Rail Mounting.................................................................................................................................................................... 53
Fig 2.38 Voltage Wiring of Accura 2500M...................................................................................................................................... 54
Fig 2.41 1DC2W Connection.................................................................................................................................................................. 55
Fig 2.42 2DC3W Connection.................................................................................................................................................................. 55
Fig 2.43 3DC4W Connection.................................................................................................................................................................. 56
Fig 2.44 Bipolar(3W) Connection......................................................................................................................................................... 56
Fig 2.45 DC Voltage Connection of Accura 2500M-VD............................................................................................................ 57
Fig 2.46 1DC2W Connection of Accura 2500M-VD.................................................................................................................... 58
Fig 2.47 Bipolar(3W) Connection of Accura 2500M-VD........................................................................................................... 58
Fig 2.48 Unipolar(2W) Connection of Accura 2500M-VD........................................................................................................ 59
Fig 2.49 Control Power Supply Wiring of Accura 2500M........................................................................................................ 59
Fig 2.50 DISPLAY Port on Accura 2500M ........................................................................................................................................ 61
Fig 2.51 Accura 2500D Rear................................................................................................................................................................... 61
Fig 2.52 Connecting Accura 2500M with 2500D using the Communication Cable.................................................... 62
Fig 2.53 Wiring of Accura 2550CMD-1P-1500A Module......................................................................................................... 63
Fig 2.54 Wiring of Accura 2550CMD-1P-750A Module............................................................................................................ 64
Fig 2.55 Through-hole Wiring of Accura 2550CMD-1P-250A Module ............................................................................. 65
Fig 2.56 Through-hole Wiring of Accura 2550CMD-1P-125A/100A/60A Module....................................................... 65
Fig 2.57 Wiring of Accura 2550DCM................................................................................................................................................. 66
Fig 2.58 Connection between Accura 2500M/2550 Modules using Internal Communication Cables............... 68
Fig 2.59 Ethernet Ports on Accura 2500M...................................................................................................................................... 69
Fig 2.60 Connecting Accura 2500M Modules via Ethernet Communication.................................................................. 70
Fig 2.61 RS-485 Port on Accura 2500M........................................................................................................................................... 71
Fig 2.62 Connecting Accura 2500M Modules via RS-485 Communication .................................................................... 71
Fig 3.1 Device Composition of Accura 2500M.............................................................................................................................. 72
Fig 3.2 Control Power Supply of Accura 2500M .......................................................................................................................... 73
Fig 3.3 Voltage Wiring of Accura 2500M......................................................................................................................................... 74
Fig 3.4 Voltage Wiring of Acura 2500M-VD................................................................................................................................... 75
Fig 3.5 Ethernet Ports on Accura 2500M......................................................................................................................................... 76
Fig 3.6 Connecting Accura 2500M Modules with Ethernet Cables for External Communication........................ 77
(Daisy-chain & Ring Topology)............................................................................................................................................................. 77
Fig 3.7 RS-485 Port on Accura 2500M ............................................................................................................................................. 78
Fig 3.8 Connecting Accura 2500M Modules with the RS-485 Cable for External Communication .................... 78
Fig 3.9 Combined Connection between Accura 2500M and Accura 2500D.................................................................. 79
Fig 3.10 Connecting Accura 2500M with Accura 2500D using the Communication Cable.................................... 79
Fig 3.11 Connection Example of Accura 2500 and Accura 2550 Modules ..................................................................... 80
Fig 3.12 Block Diagram of Custom Events...................................................................................................................................... 84
Fig 4.1 Accura 2500D Device Composition .................................................................................................................................... 86

Figures Accura 2500/2550 User Guide [DC]
Page 16 ⓒ2019 Rootech Inc. All Rights Reserved
Fig 4.2 Combined Connection with Accura 2500M.................................................................................................................... 88
Fig 4.3 Connection with Accura 2500M using the Communication Cable ..................................................................... 88
Fig 4.4 SUMMARY Measurement Screen......................................................................................................................................... 90
Fig 4.5 DC Voltage Measurement Screen........................................................................................................................................ 91
Fig 4.6 Current Measurement Screen................................................................................................................................................ 91
Fig 4.7 DC Power Measurement Screen........................................................................................................................................... 92
Fig 4.8 DC Energy Measurement Screen ......................................................................................................................................... 92
Fig 4.9 Waveform Measurement Screen .......................................................................................................................................... 93
Fig 4.10 Description Screen.................................................................................................................................................................... 93
Fig 4.11 DO(Digital Output) Information Screen ......................................................................................................................... 94
Fig 4.12 SUMMARY Setup Screen....................................................................................................................................................... 96
Fig 4.13 Voltage Measurement Setup Screen ............................................................................................................................... 96
Fig 4.14 Changed Item Displayed....................................................................................................................................................... 97
Fig 4.15 Dip Event Setup Screen.......................................................................................................................................................... 97
Fig 4.16 Ethernet Communication Setup Screen ......................................................................................................................... 98
Fig 4.17 Main CMD Setup Screen....................................................................................................................................................... 99
Fig 4.18 Reset Screen ................................................................................................................................................................................ 99
Fig 4.19 Description Setup Screen....................................................................................................................................................100
Fig 4.20 SUMMARY Setup Screen.....................................................................................................................................................102
Fig 4.21 Current Measurement Setup Screen..............................................................................................................................102
Fig 4.22 Current Event Setup Screen...............................................................................................................................................103
Fig 4.23 DC Adjustment Setup Screen............................................................................................................................................104
Fig 4.24 Description Setup Screen....................................................................................................................................................104
Fig 4.25 SUMMARY Setup Screen.....................................................................................................................................................105
Fig 4.26 Voltage Measurement Setup Screen .............................................................................................................................105
Fig 4.27 Voltage Event Setup Screen...............................................................................................................................................106
Fig 4.28 DO Setup Screen.....................................................................................................................................................................107
Fig 4.29 DC Adjustment Setup Screen............................................................................................................................................108
Fig 4.30 Description Screen..................................................................................................................................................................108
Fig 4.31 SUMMARY Event Screen......................................................................................................................................................110
Fig 4.32 Measurement Event Screen................................................................................................................................................110
Fig 4.33 RMS/DC Trend Screen...........................................................................................................................................................111
Fig 4.34 Power Quality Event Screen ...............................................................................................................................................111
Fig 4.35 RMS/DC Trend Screen...........................................................................................................................................................112
Fig 4.36 SYSTEM Events Screen..........................................................................................................................................................112
Fig 6.1 Voltage Sensing and Signal Processing..........................................................................................................................125
Fig 6.2 Current Sensing and Signal Processing ..........................................................................................................................125
Fig 6.3 Voltage and Current Sensing and Signal Processing...............................................................................................126
Fig 6.4 DC Voltage Wiring with a Single Wire (1DC2W)........................................................................................................128
Fig 6.5 DC Voltage Wiring with 2 Wires and a Common Ground Wire (2DC3W).....................................................129

Accura 2500/2550 User Guide [DC] Figures
ⓒ2019 Rootech Inc. All Rights Reserved Page 17
Fig 6.6 DC Voltage Wiring with 3 Wires and a Common Ground Wire (3DC4W).....................................................130
Fig 6.7 Bipolar DC Voltage Wiring with a Common Ground Wire....................................................................................131
Fig 6.8 Unipolar DC Voltage Wiring.................................................................................................................................................132
Fig 6.9 Equivalent Circuit of a Capacitor........................................................................................................................................134
Fig 6.10 Voltage Dip Detection ..........................................................................................................................................................136
Fig 6.10 Block Diagram of Custom Events....................................................................................................................................138
Fig 6.12 「Over」Condition Detection ............................................................................................................................................139
Fig 6.13 「Under」Condition Detection .........................................................................................................................................139
Fig 6.14 Aggregation Process..............................................................................................................................................................142
Fig B.1 Module Connection Diagram in a Single Group........................................................................................................154
Fig B.2 Module Connection Diagram in Two Groups..............................................................................................................155

Chapter 1 Product Introduction Accura 2500/2550 User Guide [DC]
Page 18 ⓒ2019 Rootech Inc. All Rights Reserved
Chapter 1 Product Introduction
Overview
Voltage, Current, and Power Measurement in AC/DC Distribution Panels
Accura 2500M module measures both AC and DC voltage. However, Accura 2550 modules are divided into
the modules that measure AC current and DC current, respectively. Therefore, you should use the Accura
2550 module that suits your needs according to the AC/ DC voltage specifications of distribution panels.
Dip(Sag)/Swell Data Available for Power Quality Analysis
Accura 2500/2550 provide data on voltage dips and swells for power quality analysis. It allows energy
managers to easily identify changes in power quality in various distribution panels at power facilities,
enabling effective power quality management.
Highly Accurate Measurements of Voltage, Current, Power and Energy
Recently, it has become essential to establish enterprise-wide energy management systems for efficient
energy usage at sites such as plants, factories, and buildings due to greenhouse gas emission regulations.
A key factor determining reliability of energy management systems is the measurement accuracy of meters.
Accura 2500/2550 provide highly accurate measurements of voltage/current/ power/energy, enabling
accurate analysis and diagnosis of various problems in energy management at power facilities.
Max/Min/Average Values Available within an Aggregation Interval
Accura 2500/2550 provide measured values for every 0.2-second frame based on voltage, current, and power
values measured for each subframe (16.7 ms or 20 ms). It also provides the maximum/minimum/average
values for various aggregation intervals, including 1 second, 5 seconds, 1 minute, 5 minutes, 1 hour and 6
hours, as well as timestamped data for the max/min values. Since it offers measurement data that change
instantaneously in aggregation intervals, it allows for accurate trend analysis of voltage, current and power.
It also helps to reduce workload on data collection and calculation of the host system.
Proven Safety and Reliability with CE/UL/KC Certifications(UL Certification Process
Underway)
Accura 2500/2550's internal and external structures(product and circuit design) meet safety and reliability
requirements for CE(EN 55011, EN IEC 61326-1, EN IEC 61326-2-1, EN IEC 61000-3-2, EN 61000-3-3),
UL(UL61010-1 3rd edition, IEC 61010-2-030 2nd edition), and KC(EN 55011, EN IEC 61326-1, EN IEC 61326-
2-1) standards.

Accura 2500/2550 User Guide [DC] Chapter 1 Product Introduction
ⓒ2019 Rootech Inc. All Rights Reserved Page 19
Compatible with MCCBs with Various Ratings / Compact Size
Accura 2550CMD module is compatible with MCCBs with various current ratings since it has identical
installation dimensions and wiring hole positions. Thus, it can be installed with existing MCCBs in distribution
panels. Its compact size with minimized width also allows for easy installation.
Fig 1.1 Identical Lengths of Accura 2550CMD and MCCBs with Various Ratings
Through-hole Type Structure for Easier and Safer Installation
Accura 2550CMD module features the through-hole type current sensing structure with busbars, which
does not require electrical contact with cables, including busbars. Therefore, it ensures safety from electrical
accidents, as well as easy installations. The TM-CM terminal block allows for easier electrical wiring.
Fig 1.2 Through-hole type Current Sensing Structure of Accura 2550CMD

Chapter 1 Product Introduction Accura 2500/2550 User Guide [DC]
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Product Information
Smart DC Distribution Panel Digital Power Meter
The Smart DC Distribution Panel Digital Power Meter product line consists of Accura 2500D installed at the
front of the distribution panel, Accura 2500M installed inside the distribution panel or at the rear of Accura
2500D, Accura 2550CMD installed at branch lines in the distribution panel and Accura 2550DCM, which
directly measures DC voltage and current simultaneously.
Accura 2500M module receives measurement data from multiple Accura 2550CMD/DCM modules via
internal communication and provides the data through Accura 2500D. Accura 2500M can be combined with
Accura 2500D. Thus, users can install it by connecting it to the back of Accura 2500D, or it can be installed
separately.
Module Type Model Description Weight
Main distribution
panel module
Accura 2500M Measures the voltage of the incoming line in the
AC/DC distribution panel
500 g
Transmits the sampled voltage data to Accura
2550
Receives measurement data from Accura 2550
Sends/receives set values and measured data
to/from Accura 2500D
Communicates with the host system
Can be attached/detached to/from the back of
Accura 2500D
Accura 2500M-VD Voltage Divider is attached to Accura 2500M. 620 g
Measures high voltages in DC distribution panels
Main distribution Accura 2500D 5” Color TFT LCD (built-in touch panel) 400 g
panel HMI module Sends/receives set values and measured data
to/from Accura 2500M
Displays measured values and allows users to
set
up parameters on the LCD screen
Accura 2500M can be attached/detached
to/from the back of Accura 2500D.
DC power measuring Accura 2550CMD-1P -1500A Basic current 1,500 Adc 3,000 g
module -750A Basic current 750 Adc 850 g
-250A Basic current 250 Adc 125 g
-125A Basic current 125 Adc 85 g
-100A Basic current 100 Adc 80 g
-60A Basic current 60 Adc 80 g
DC power measuring Accura 2550DCM-500V -80A Basic voltage 500 Vdc / Basic current 80 Adc 250 g
meter Accura 2550DCM-50V -80A Basic voltage 50 Vdc / Basic current 80 Adc 250 g
Terminal block for TM-CM-1P -105 Accura 2550CMD-1P-250A terminal block 240 g
Accura 2550CMD -60 Accura 2550CMD-1P-125A terminal block 135 g
-50L Accura 2550CMD-1P-100A terminal block 125 g
-50 Accura 2550CMD-1P-60A terminal block 90 g