ROOTECH ACCURA 3500S User manual

◼
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.

Page 2
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.

Page 3
◼During normal operation of the product, hazardous voltages are present on the
terminals that connect PTs/CTs, digital inputs, power, and external I/O circuits. The
PT/CT secondary can produce lethal voltage or current caused by the energy of the
primary.
◼Standard safety precautions should be followed during the installation and maintenance
of the product, including removing PT fuses and shorting CT secondaries.
◼Install the product in enclosures or a similar cabinet to prevent access to the terminal
strips of the product after wiring.
Caution
Observe the following instructions, or it may cause permanent damage to the product.
◼Do not apply voltages and currents that exceed the input ratings of the PT and CT to the
product.
◼Using the device for other purposes not specified by the manufacturer can cause severe
damage to the product.
◼Connect the chassis ground terminal of the product to the earth ground to protect the
device from noise and surge. Failure to properly connect the chassis ground will void
the warranty of the product.

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About the Manual
Rootech, Inc. reserves the right to make changes in the product specifications shown in this User
Guide without prior notice. We recommend that customers should obtain the latest information on
product specifications and the manual before making orders.
In the absence of written agreements, Rootech, Inc. assumes no liability for applications assistance,
customer’s system design, or infringement of patents or copyrights induced by third parties arising
from the use of the products described herein.
We endeavor to provide accurate information in the document. However, we are not responsible
for any errors which may appear here and reserves the right to make changes without prior 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.

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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 coming from when 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,

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or removed.
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 with system design provided by Rootech's personnel or representatives
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 the product and
associated documentation. The original purchaser should acknowledge that 100% up time is not
realizable because of possible hardware or software defects. The original purchaser should
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
Process Control Equipment
E324900
KCC-REM-RTE-ACCURA3500S

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Revision History
The following versions of the Accura 3500S User’s Guide have been released.
Revision
Revision date
Description
Revision 1.0
2008. 03. 05
Initial draft
Revision 1.1
2010. 10. 07
Voltage input rating adjusted
Revision 1.2
2015. 05. 12
Standard compliance updated
Revision 1.3
2016. 09. 05
Voltage wiring diagram updated
Revision 1.4
2017. 08. 07
IrDA deleted
Revision 1.5
2017. 09. 20
UL Certification code changed
Revision 1.6
2018. 01. 02
Notice, Warranty changed
Revision 1.9
2022. 04. 13
Setup items, wiring diagrams and screen images
changed

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Contents
Notice.............................................................................................................................................. 1
Chapter 1 Introduction .................................................................................................................... 13
Overview.......................................................................................................................................13
Cost-effective Power Meter Providing Digital/Analog Inputs and Outputs...................................13
Accurate Measurements/ Power Quality Data Available............................................................13
CE/UL Safety and Reliability....................................................................................................13
Easily Attachable I/O Modules ................................................................................................14
Features ........................................................................................................................................15
Measurement.........................................................................................................................15
Power Quality.........................................................................................................................15
Basic Module .........................................................................................................................15
Expansion Module1.................................................................................................................15
Communication .....................................................................................................................16
Power Supply..........................................................................................................................16
Applications...................................................................................................................................17
True RMS Measurements.........................................................................................................17
Power Quality Analysis............................................................................................................17
Module Structure to adapt to different requirements in the field.................................................17
Ideal for Replacing Analog Meters...........................................................................................17
Highly Reliable Energy Management .......................................................................................17
Parameters.............................................................................................................................19
Item............................................................................................................................................... 19
Chapter 2 Mounting ..................................................................................................................... 20
Environmental Conditions.......................................................................................................20
Before You Begin ...........................................................................................................................21
Meter Overview......................................................................................................................21
Meter Dimensions ..................................................................................................................22
Step 1: Mounting.........................................................................................................................23
Sequence...............................................................................................................................23
Step 2: Voltage and Current Inputs...............................................................................................24

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Voltage Input..........................................................................................................................24
Current Input .........................................................................................................................25
Wiring Diagram Using External PTs .........................................................................................26
Direct Connection Diagram Using No PTs................................................................................29
Step 3: Wiring the Device for RS485 Communication ......................................................................32
Step 4: Wiring the Power Supply and Ground Terminal ....................................................................33
Power Supply..........................................................................................................................33
Ground Terminal....................................................................................................................33
Step 5: Adding the Basic Module DIO module]................................................................................34
Step 6: Wiring the Basic Module .....................................................................................................35
DIO Module...........................................................................................................................35
Step 7: Wiring the Power Supply and Ground Terminal of the Basic Module......................................38
Power Supply..........................................................................................................................38
Ground Terminal....................................................................................................................39
Step 8: Adding the Expansion Module ..........................................................................................40
Step 9: Wiring the Expansion Module..............................................................................................41
DI Module..............................................................................................................................41
DO Module............................................................................................................................43
Fig 1.31 DO Module ..............................................................................................................43
AI Module..............................................................................................................................45
AO Module............................................................................................................................46
Step 10: Wiring the Power Supply and Ground Terminal of the Expansion Module ............................47
Power Supply..........................................................................................................................47
Ground Terminal....................................................................................................................48
Step 11: Powering Up the Meter ...................................................................................................49
Chapter 3 Meter Operation/Setup .................................................................................................. 50
Display Mode ................................................................................................................................51
Setup Mode...................................................................................................................................58
Reset Mode....................................................................................................................................60
System Mode.................................................................................................................................61
Reactive Power Calculation .....................................................................................................63
Module Mode................................................................................................................................66
Module Display Menu.............................................................................................................66
Module Setup Menu ...............................................................................................................68

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Appendix A Specifications ................................................................................................................ 72
Appendix B Standard Compliance .................................................................................................. 73
Appendix C Test Report.................................................................................................................. 74
Measuring Test...............................................................................................................................74
Reliability Test ................................................................................................................................75

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Figures
Fig 1.1 Front Side...................................................................................................................21
Fig 1.2 Rear Side....................................................................................................................21
Fig 1.3 Rear Side of Basic Module[DIO Module] ......................................................................21
Fig 1.4 Front View ..................................................................................................................22
Fig 1.5 Rear View ...................................................................................................................22
Fig 1.6 Side View ...................................................................................................................22
Fig 1.7 Side View[one expansion module attachable as an option when ordering the product]...22
Fig 1.8 ANSI 4”......................................................................................................................23
Fig 1.9 DIN96........................................................................................................................23
Fig 1.10 Voltage and Current Connector.................................................................................24
Fig 1.11 Single Phase 2 Wire Connection, Wiring Mode = 1P2U..............................................26
Fig 1.14 Three Phase 4 Wire Connection Using 3 PTs and 3 CTs, Wiring Mode = 3P4U ............28
Fig 1.15 Single Phase 2 Wire Direct Connection, Wiring Mode = 1P2U....................................29
Fig 1.16 Single Phase 3 Wire Direct Connection Using 2 CTs, Wiring Mode = 1P3U .................30
Fig 1.17 Three Phase 3 Wire Open Delta Direct Connection, Wiring Mode = 3P3O..................30
Fig 1.18 Three Phase 3 Wire Open Delta Direct Connection Using 3 CTs Wiring Mode = 3P3O 31
Fig 1.19 Three Phase 4 Wire Direct Connection Mode Using 3 CTs Wiring Mode = 3P4U .........31
Fig 1.20 Communication Wiring .............................................................................................32
Fig 1.21 Wiring of Power Supply and Ground Terminal ............................................................33
Fig 1.22 Adding the Basic Module...........................................................................................34
Fig 1.23 DIO Module .............................................................................................................35
Fig 1.24 Digital Inputs ............................................................................................................36
Fig 1.25 DC Relay Application ................................................................................................37
Fig 1.26 AC Relay Application.................................................................................................37
Fig 1.27 Wiring of Power Supply and Ground Terminal of the Basic Module..............................38
Fig 1.28 Adding the Expansion Module ...................................................................................40
Fig 1.29 DI Module ................................................................................................................41
Fig 1.30 Digital Input .............................................................................................................42
Fig 1.32 DC Relay Application ................................................................................................44
Fig 1.33 AC Relay Application.................................................................................................44
Fig 1.34 AI Module ................................................................................................................45

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Fig 1.35 Analog Inputs ...........................................................................................................45
Fig 1.36 AO Module ..............................................................................................................46
Fig 1.37 Analog Output..........................................................................................................46
Fig 1.38 Wiring of Power Supply and Ground Terminal of the Expansion Module ......................47
Fig 2.1 Measurement Group A, B............................................................................................51
Fig 2.2 Measurement Group C ...............................................................................................51
Fig 2.3 Measurement Group D ...............................................................................................51
Fig 2.4 x1000, x10 LED..........................................................................................................52
Fig 2.5 P, Q[according to general calculation]..........................................................................64
Fig 2.6 DIO module channel information ................................................................................67
Fig 2.7 DI module channel information ...................................................................................67
Fig 2.8 DO module channel information .................................................................................67
Fig 2.9 AI module channel information†..................................................................................67
Fig 2.10 AO module channel information†..............................................................................67
Fig 2.11 DIO module digital output channel 1 setup................................................................71
Fig 2.12 DIO module digital output channel 2 setup ..............................................................71
Fig 2.13 DO†module digital output channel 1 setup................................................................71
Fig 2.14 DO†module digital output channel 2 setup................................................................71
Fig 2.15 DO†module digital output channel 3 setup................................................................71
Fig 2.16 DO†module digital output channel 4 setup................................................................71

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Chapter 1 Introduction
Overview
Cost-effective Power Meter Providing Digital/Analog Inputs and Outputs
Accura 3500S is an integrated digital power meter that performs power measurements and also
provides digital/analog inputs and outputs. It is cost-effective in that it perfectly suits the needs of
managing various digital and analog inputs and outputs in the field. Thus, Accura 3500S
eliminates the need to buy extra RTU products. It can be widely used in manufacturing plants, IBS,
semiconductor plants, etc, where power measurements and the management of inputs and
outputs are required.
Accurate Measurements/ Power Quality Data Available
Measurement accuracy is a key factor that determines the reliability of energy management
systems. Low measurement accuracy causes inconsistency between the energy of the incoming
feeder and the sum of energy measured on the load side. It makes it difficult to perform reliable
energy management. Accura 3500S provides highly accurate measurements of voltage and
current (±0.2% of reading) and meets IEC 62053-22 class 0.5S for power and energy
measurements. It helps to address problems caused by measurement errors and allows for
efficient energy management. Accura 3500S provides power quality data such as voltage/current
THD, harmonics, and K-Factor.
CE/UL Safety and Reliability
The internal and external structures(the product and circuit design) of Accura 3500S meet safety
requirements for CE(IEC 61010) and UL(UL 61010-2, 2nd edition) standards. The busbar
provided with the product allows for easier wiring of CTs when installing the product. The busbar
minimizes fire hazards by ensuring safety under an overcurrent condition. And the optic interface
between the meter and connected modules removes risks of electrical hazards.

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Easily Attachable I/O Modules
A variety of I/O expansion modules can be easily attached to the rear side of the Accura 3500S
device. The I/O modules available include the digital input, digital output, analog input, and
analog output modules. Users can purchase the module they need when ordering the Accura
3500S device.

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Features
Measurement
◼64 samples/cycle, True RMS
◼IEC 62053-22 Class 0.5S
◼50, 60Hz
◼Energy stored periodically to non-volatile memory.
◼4 Quadrant Energy
kWh/kVARh received1, kWh/kVARh delivered1
kWh/kVARh net[kWh/kVARh received - kWh/kVARh delivered]
kWh/kVARh total[kWh/kVARh received + kWh/kVARh delivered]
◼Phase voltage, line to line voltage, current
◼Active power, reactive power, active energy, reactive energy†, power factor, frequency
◼Fundamental component†, True RMS of current
◼4 Quadrant Power
◼Demand, peak demand
◼Maximum, Minimum†
1kWh/kVARh received is positive for “view as load”, kWh/kVARh
delivered is positive for “view as generator”.
Power Quality
◼Voltage/current THD
◼Harmonic Analysis†
◼K factor†
†It is available only on RS485 communication.
Basic Module
◼DIO Module: Digital Input/output, 8/2 channels
Expansion Module1
◼DI Module: Digital Input 12 channels

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◼DO Module: Digital Output 4 channels
◼AI Module: Analog Input 6 channels
◼AO Module: Analog Output 6 channels
1Only one module to be chosen as option when ordering.
Communication
◼RS485 Port[rear]
Modbus RTU Protocol
Baud rate: 1,200 - 57,600bps
Power Supply
◼AC 85 - 265V, 50/60Hz
◼DC 100 - 300V
◼Burden: 10VA

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Applications
True RMS Measurements
Nonlinear loads mainly used in the field include rectifiers and electric furnaces and cause
harmonics that involve severe voltage and current waveform distortion. Accura 3500S performs
true RMS measurements for voltage and current waveforms distorted due to harmonics.
Power Quality Analysis
Accura 3500S provides data on voltage and current THD and K-Factor and allows for the analysis
of voltage and current harmonics up to the 31st order. It allows for effective analysis of power
quality by providing real time data on voltage and current waveforms.
Module Structure to adapt to different requirements in the field
I/O expansion modules can be easily added to the rear side of Accura 3500S. Thus, its modular
structure helps to meet requirements for various applications in the field. In the existing
IBS(Intelligent Building System), all I/O modules should be connected to the DDC panel. It results
in increased costs and reduced system reliability. The DDC panel can be easily replaceable with
Accura 3500S since the device performs the function of the DDC panel. With reduced costs and
greater system reliability, Accura 3500S helps to establish optimized intelligent building systems.
Ideal for Replacing Analog Meters
Accura 3500S meets both NSI C39.1(4" Round) and DIN 96 standards for installation. It features
the installation dimensions same as those of analog meters. Thus, there is no need to create
cutouts on the panel when installing Accura 3500S in the existing switchgear panels. It makes it
easy to replace analog meters with digital meters.
Highly Reliable Energy Management
Energy management includes monitoring energy consumption, managing energy costs and

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energy demand, replacing energy facilities, and performing energy planning. In this regard,
measurement accuracy is a key factor that determines the reliability of energy management
systems. Accura 3500Sprovides highly accurate measurements of voltage and current (±0.2% of
reading) and meets IEC62053-22 class 0.5S for power and energy measurements. It allows for
efficient energy management through accurate measurements

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Parameters
Item
Real-time1
Average2
Total3
Maximum4
Minimum5
Phase voltage
■
■
■
■†
Line to line voltage
■
■
■
■†
Current
■
■
■
Power
Active
■
■
■
Reactive
■†
■
■†
Apparent
■†
■†
■†
Energy6
Active
■
Reactive
■†
Apparent
■†
Frequency
■
Power factor
■†
■
THD
Voltage
■
Current
■
Demand
Power
■
■
Current
■
■
†It is available only via RS485 communication.
1Instaneous value of each parameter 2Average value of three phase parameters. 3Total value of three phase
parameters.
4If a real-time value is greater than the maximum value, the maximum value is updated.(The value
measured within 10 msecs after power up is ignored.)
5If If a real-time value is smaller than the minimum value, the minimum value is updated. (The value
measured within 10 msecs after power up is ignored.)
6Energy values are periodically stored to non-volatile memory.
Note
The Maximums and minimums will not be updated with no power-up.
Measurement data are not shown for 5 seconds after power-up.

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Chapter 2 Mounting
Environmental Conditions
The Accura 3500S should be mounted in a dry, dirt free location away from heat sources and very
high electric fields. To operate properly and effectively, environmental conditions should range
within the following guidelines
Environmental Conditions
Description
Installation location
Indoors
Operating Temp
-20 to 70C[-4 to 158℉]
Storage Temp
-40 to 85C[-40 to 185℉]
Operating Humidity
5 - 95% (non-condensing)
Caution
The meter should be installed in a switchgear cabinet or similar enclosure to ensure the terminal
strips on the meter base are not user accessible after installation.
Mount the meter in a dry location free from dirt and corrosive vapors. Once installed, no cleaning
of the device is necessary.