ROOTECH Accura 3550S User manual

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Notice
Symbols
Caution
Indicates the presence of dangerous voltage which can cause severe injury or death
to persons 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.
◼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

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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.
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-Accura3550S

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Revision History
The following versions of the Accura 3550S User’s Guide have been released.
Revision #
Revision date
Description
Firmware version
Revision 1.0
2008. 03. 05
Initial draft
Revision 1.1
2000. 11. 28
Voltage input range modified
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
Symbols ..........................................................................................................................................2
Chapter 1 Introduction .................................................................................................................... 11
Overview.......................................................................................................................................11
AC/DC Power Measurements for Rectifier Panels......................................................................11
Accurate Measurements / Power Quality Data Available...........................................................11
Proven Safety and Reliability with CE/UL Certifications..............................................................11
Features ........................................................................................................................................12
Measurement.........................................................................................................................12
Power Quality.........................................................................................................................12
Basic Module .........................................................................................................................12
Communication .....................................................................................................................12
Power Supply..........................................................................................................................13
Applications...................................................................................................................................14
Power Measurements for Rectifier Panels..................................................................................14
True RMS Measurements.........................................................................................................14
Power Quality Analysis............................................................................................................14
Ideal for Replacing Analog Meters...........................................................................................14
Highly Reliable Energy Management .......................................................................................14
Parameters ....................................................................................................................................15
Item............................................................................................................................................... 15
Chapter 2 Mounting........................................................................................................................ 16
Environmental Conditions.......................................................................................................16
Before You Begin ...........................................................................................................................17
Meter Overview......................................................................................................................17
Meter Dimensions ..................................................................................................................18
Step 1: Mounting.........................................................................................................................19
Sequence...............................................................................................................................19
Step 2: Voltage and Current Inputs...............................................................................................20
Voltage Input..........................................................................................................................20
Current Input .........................................................................................................................21
Wiring Diagram Using External PTs .........................................................................................22
Direct Connection Diagram Using No PTs................................................................................25
Step 3: Wiring the Device for RS485 Communication ......................................................................28

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Step 4: Wiring the Power Supply and Ground Terminal ....................................................................29
Power Supply..........................................................................................................................29
Ground Terminal....................................................................................................................29
Step 5: Adding the Basic Module[DC module] .................................................................................30
Step 6: Wiring the Basic Module .....................................................................................................31
DC Module ............................................................................................................................31
Step 7: Wiring the Power Supply and Ground Terminal of the Basic module......................................34
Power Supply..........................................................................................................................34
Ground Terminal....................................................................................................................35
Step 8: Powering Up the Meter .....................................................................................................36
Chapter 3 Meter Operation/Setup .................................................................................................. 37
Display Mode ................................................................................................................................38
Setup Mode...................................................................................................................................43
Reset Mode....................................................................................................................................45
System Mode.................................................................................................................................46
Reactive Power Calculation .....................................................................................................48
Module Mode................................................................................................................................50
Module Display Menu.............................................................................................................50
Module Setup Menu ...............................................................................................................52
Appendix A Specifications ................................................................................................................ 57
Appendix B Standard Compliance .................................................................................................. 58
Appendix C Test Report.................................................................................................................. 59
Measuring Test...............................................................................................................................59
Reliability Test ................................................................................................................................60
Appendix D DC Voltage Scale Setup ................................................................................................. 61
Setup Menu for the Channels of Each Module..........................................................................61
Calculation of DC Voltage Scale .............................................................................................61

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Figures
Fig 1.1 Front Side...................................................................................................................17
Fig 1.2 Rear Side....................................................................................................................17
Fig 1.3 Basic Module[DC Module] Rear Side............................................................................17
Fig 1.4 Front View ..................................................................................................................18
Fig 1.5 Rear View ...................................................................................................................18
Fig 1.6 Side View ...................................................................................................................18
Fig 1.7 ANSI 4”......................................................................................................................19
Fig 1.8 DIN96........................................................................................................................19
Fig 1.9 Voltage and Current Connector ...................................................................................20
Fig 1.10 Single Phase 2 Wires, Wiring Mode = 1P2U ..............................................................22
Fig 1.11 Three Phase 3 Wire Open Delta Using 2CTs, Wiring Mode = 3P3O............................23
Fig 1.12 Three Phase 3 Wire Open Delta Using 3CTs, Wiring Mode = 3P3O............................23
Fig 1.13 Three Phase 4 Wires Using 3 PTs and 3 CTs, Wiring Mode = 3P4U.............................24
Fig 1.14 Single Phase 2 Wire Direct , Wiring Mode = 1P2U .....................................................25
Fig 1.15 Single Phase 3 Wire Direct Using 2 CTs, Wiring Mode = 1P3U ...................................26
Fig 1.16 Three Phase 3 Wire Open Delta Direct, Wiring Mode = 3P3O....................................26
Fig 1.17 Three Phase 3 Wire Open Delta Direct Using 3 CTs, Wiring Mode = 3P3O .................27
Fig 1.18 Three Phase 4 Wire Direct Using 3 CTs, Wiring Mode = 3P4U ....................................27
Fig 1.19 Communication Wiring .............................................................................................28
Fig 1.20 Wiring of Power Supply and Ground Terminal ............................................................29
Fig 1.21 Adding of a Basic Module .........................................................................................30
Fig 1.22 DC Module...............................................................................................................31
Fig 1.23 DC Voltage/Current..................................................................................................32
Fig 1.24 Digital Input .............................................................................................................32
Fig 1.25 DC Relay application ................................................................................................33
Fig 1.26 AC Relay application.................................................................................................33
Fig 1.27 Wiring of Power Supply and Ground Terminal of a Basic module.................................34
Fig 2.1 Group A, B.................................................................................................................38
Fig 2.2 Group C ....................................................................................................................38
Fig 2.3 Group D ....................................................................................................................38
Fig 2.4 Group E .....................................................................................................................38
Fig 2.5 x1000, x10 LED..........................................................................................................39
Fig 2.6 P, Q[according to general calculation]..........................................................................48

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Fig 2.7 DC module channel information..................................................................................51
Fig 2.8 DC module rectifier current shunt ................................................................................55
Fig 2.9 DC module battery current shunt .................................................................................55
Fig 2.10 DC module digital input channel 1 of rectifier fault.....................................................55
Fig 2.11 DC module digital input channel 2 of rectifier fault.....................................................55
Fig 2.12 DC module digital input channel 3 of rectifier fault.....................................................56
Fig 2.13 DC module digital input channel 4 of rectifier fault.....................................................56
Fig 2.14 DC module digital output channel 1 setup .................................................................56

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Chapter 1 Introduction
Overview
AC/DC Power Measurements for Rectifier Panels
Accura 3550S is a high accuracy digital power meter for rectifier panels and performs both AC
and DC power measurements. In existing rectifier panels, DC transducers are used to measure
DC voltages and currents and converted them into analog signals, and users can get the data via
analog inputs of the RTU. However, multiple signal conversions during the process decreases the
reliability of the data, and purchasing the RTU also increases the system’s total cost. Accura 3550S
directly measures DC voltages and currents(with a shunt resistor) without needing to install the TD.
By doing so, it helps solve the data reliability issue. The device is also cost-effective in that it can
replace the RTU by performing the function of the RTU.
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. It also provides a range of power quality data, including
voltage/current harmonics and THD and K-Factor.
Proven Safety and Reliability with CE/UL Certifications
The internal and external structures(the product and circuit design) of Accura 3550S meet safety requirements
for CE(IEC61010) and UL(UL61010-2, 2nd edition) standards. A busbar is provided with the product 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 the connected modules removes risks
of electrical hazards that may occur when attaching/detaching the modules.

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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 via RS485 communication.
Basic Module
◼DC Module:
DC Voltage Input 1 channel
DC Current Input 2 channels
Digital Input 4 channels
Digital Output 1 channel
Communication
◼RS485 Port[rear]
Modbus RTU Protocol
Baud rate: 1,200 ~ 57,600bps

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Power Supply
◼AC 85 ~ 265V, 50/60Hz
◼DC 100 ~ 300V
◼Burden: 10VA

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Applications
Power Measurements for Rectifier Panels
Rectifier panels ensure reliability of power supply during power interruptions in that all the
equipment use the DC power of the rectifier panel as the power supply. Designed specifically for
use with rectifier panels, Accura 3550S performs not only AC power measurements for the input
parameter, but also DC power measurements for the output parameter. It also provides data on
the status of the rectifier.
True RMS Measurements
Harmonics can cause severe distortion in input voltage and current waveforms measured in the
rectifier panel. Accura 3550S performs true RMS measurements for voltage and current
waveforms distorted due to harmonics.
Power Quality Analysis
Accura 3550S 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.
Ideal for Replacing Analog Meters
Accura 3550S 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 3550S 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
energy demand, replacing energy facilities, and performing energy planning. In this regard,
measurement accuracy is a key fac tor that determines the reliability of energy management
systems. Accura 3550S 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 allows for
efficient energy management through accurate measurements.

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Parameters
Item
Realtime1
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
■†
■†
DC
Voltage
■
Current
■
1Instaneous value of each parameter 2Average value of three phase parameters 3Total value of three
phase parameters.
4 If 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.)
5 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.
†It is available only via RS485 communication.
Note
The maximums and minimums will not be updated with no power-up.
All of the measurements are not shown for 5 seconds after power-up.

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Chapter 2 Mounting
Environmental Conditions
The Accura 3550S 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
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.

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Before You Begin
Before installing the meter, observe the instructions in this guide and read the safety precautions
presented on the “Installation Considerations”page.
Caution
Power up after the voltage and current wiring is completed.
Meter Overview
Fig 1.1 Front Side
Fig 1.2 Rear Side
Fig 1.3 Basic Module[DC Module] Rear Side

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Meter Dimensions
Fig 1.4 Front View
Fig 1.5 Rear View
Fig 1.6 Side View

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Step 1: Mounting
Sequence
1. Remove connector on the bottom of the meter.
2. Fit the meter into cutout[ANSI 4”or DIN96]
3. Fix the meter onto the panel by turning the mounting nut. When conforming to the
DIN96 standard, there is no need to drill holes on the panel.
Fig 1.7 ANSI 4”
Fig 1.8 DIN96
Note
The meter is mounted on switchgear boards (metal cabinet) in electrical facilities.

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Step 2: Voltage and Current Inputs
Fig 1.9 Voltage and Current Connector
Voltage Input
Item
Description
Pin name
V1, V2, V3, Vn
Connector
Terminal block
Wire spec
2.1 to 3.5 mm2[ 14 to 12 AWG]
Rating1
0 ~ 600V 3 ~ L-L[Line to line], 0 ~ 457V 3 ~ L-N[Line to neutral]
Burden
0.02VA/phase @220V
Impedance
3MΩ/phase
Compliance
Pollution degree 2, Installation Category Ⅲ
Caution
In three phase 3 wire open delta direct connection mode, line to line voltage should not exceed
457V because the voltage is applied to the inputs of phase voltage.
PT[Potential Transformer]
PTs are required for all systems with voltage levels greater than these above. The meter inputs can
be used with PTs that have secondaries rated between AC 0V and 457V. PTs should comply with
IEC 61010-1 2nd Edition, Pollution Degree 2, Overvoltage Category Ⅲ.
Caution
In case where PTs are required, fuses should be installed on the secondary of the PTs.