ROOTECH ACCURA 3550 User manual

ACCURA 3550
Digital Power Meter for Rectifier Panel
Replaces TD and RTU
User Guide[English]
Rev 1.8 2018/01/02

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Notice
Caution
Indicates the presence of
dangerous voltage which can cause severe injury or death
to persons if proper precautions are not followed.
Warning
Alerts
the user to the presence of hazards which can cause somewhat injury to
p
ersons, damage to property or damage to the device itself, if proper precautions
are not followed.
Note
Indicates the user’s attention to installation, operating and maintenance instructions.
Electrical Symbols
Indicates alternative voltage or current.
Indicates direct voltage or current.
Installation Considerations
Installation and operation of Accura 3550 meter should be performed only by qualified,
competent personnel that have appropriate training and experience with high voltage and current
devices.
Caution
Failure to observe the following instructions may result in severe injury or death.
During normal operation of the Accura 3550 meter, hazardous voltages are present on
its terminal strips.
Standard safety precautions are followed while performing any installation or service
work[removing PT fuses, shorting CT secondaries, etc].
Do not access to terminal strips of the Accura 3550 meter after installation.

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Warning
Observe the following instructions, or permanent damage to the meter may occur.
Do not apply Accura 3550 to voltages and currents that exceed Input ratings of PT and
CT.
Manual
Rootech Inc. reserves the right to make changes in the device specifications shown in this User
Guide without notice. Rootech Inc. advises customers to obtain the latest specifications of device
before giving orders to confirm that the information being relied on by the customer is up to date.
In the absence of written agreement to the contrary, Rootech Inc. assumes no liability for Rootech
Inc. applications assistance, customer’s system design, or infringement of patents or copyrights of
third parties by or arising from the use of devices described herein.
Limitation of Liability
Where applicable law allows and does not prohibit or restrict such limitation, the Rootech, Inc’s
liability for anything relating to this product shall be limited to the price paid for the product.
Warranty Information
For products and software that are sold or licensed by Rootech Inc. during the period from the
date of receipt by you until the present, Rootech warrants only to the original purchaser
The purchased products other than software shall be substantially free from material defects in
material and workmanship by Rootech for two years from the date receipt by you.

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The software itself is provided “as is”without any warranty of any kind.
Limitation of Warranty
These limited Warranties shall not apply to any product that has been subject to alteration,
accident, misuse, abuse, neglect or failure to exactly follow Power Measurement's instructions for
operation and maintenance.
In order for the original purchaser to make a claim under the warranties described above, the
original purchaser must promptly contact Rootech headquarter. After receiving such notice,
Rootech may either in Rootech’s sole discretion, examine the product at the original purchaser’s
site or issue shipping instructions to the original purchaser to return the relevant product to
Rootech for examination at the original purchaser’s expense, transportation charges prepaid.
If after examining the product Rootech reasonably confirms that such examined product does not
meet the warranties, then the original purchaser’s sole remedy and Rootech’s sole obligation or
liability shall be, at Rootech’s option, to repair, replace or refund the price paid for that product.
Regardless of whether any remedy set forth herein fails of its essential purpose, except to the
extent the following limitation is prohibited by applicable law, Rootech shall not, in any event or
under any legal claim or theory, be liable to the original purchaser or any other person or entity
for special, indirect, incidental, punitive, liquidated, special or consequential damages whatsoever
with respect to any purchased product, including, without limitation, business interruption, loss of
use, profit or revenue, even if Rootech has been advised of the possibility of such damages. To the
extent that a limitation or exclusion of consequential damages are prohibited by applicable law,
then Rootech’s liability shall be limited to twice the amount of the relevant purchased product.
Rootech shall not be liable for any claim- other than a claim solely for the breach of one of the
above warranties that is made in accordance with the above described procedures- made by the
original purchaser, its employees, agents, or contractors for any loss, damage, or expense
incurred due to, caused by, or related to any purchased product
Any technical assistance provided by Rootech's personnel or representatives in system design shall
be deemed to be a proposal and not a recommendation. The responsibility for determining the
feasibility of such proposals rests with the original purchaser and should be tested by the original
purchaser.

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It is the original purchaser’s responsibility to determine the suitability of any product and
associated documentation for its purposes. The original purchaser acknowledges that 100% "up"
time is not realizable because of possible hardware or software defects. The original purchaser
recognizes that such defects and failures may cause inaccuracies or malfunctions.
Only the terms expressed in these limited Warranties shall apply and no distributor, corporation or
other entity, individual or employee of Rootech or any other entity is authorized to amend, modify
or extend the Warranties in any way.
Copyright © 2006, Rootech Inc.
Headquarter
102-611, Digital Empire2, Sinwonro-88,
Suwon, Korea
Tel : [phone] Fax : [phone]
Homepage
www.rootech.com
E-mail
[email protected]

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Standard Compliance
CE Approved
EN61326 and IEC61010
Process Control Equipment
E324900
QMS-1347 KAB-QC-09

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Revision History
The following versions of the Accura 3550 User’s Guide have been released.
Revision #
Revision date
Description
Firmware version
Revision 1.0 2006. 06. 30 Initial draft
Revision 1.1 2007. 04. 24 Modifying basic module recognition 1.17
Revision 1.2 2007. 07. 13 Mounting modified
Revision 1.3 2009. 11. 28 Voltage input range modified
Revision 1.4 2015. 05. 12 Standard compliance updated
Revision 1.5 2016. 09. 05 Voltage wiring diagram updated
Revision 1.6 2017. 08. 07 IrDA deleted
Revision 1.7 2017. 09. 20 UL Certification code changed
Revision 1.8 2018. 01. 02 Notice, Warranty changed

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Contents
Chapter 1 Introduction ...................................................................................................................................13
Overview .........................................................................................................................................................................................13
AC/DC Measurements dedicated to Rectifier ....................................................................................................13
Accuracy, Power Quality................................................................................................................................................13
CE/UL Safety and Reliability........................................................................................................................................13
Features ...........................................................................................................................................................................................14
Measurement .....................................................................................................................................................................14
Power Quality.....................................................................................................................................................................14
Basic Module......................................................................................................................................................................14
Communication.................................................................................................................................................................14
Power Supply......................................................................................................................................................................14
Applications...................................................................................................................................................................................15
Measurements dedicated to Rectifier....................................................................................................................15
True RMS Measurements robust to harmonics.................................................................................................15
Power Quality Analysis ..................................................................................................................................................15
Compatibility with Analog Meters...........................................................................................................................15
High Reliability Energy Management.....................................................................................................................15
Parameters .....................................................................................................................................................................................16
Chapter 2 Mounting........................................................................................................................................17
Environmental Conditions............................................................................................................................................17
Enclosure Considerations .............................................................................................................................................17
Before You Begin ........................................................................................................................................................................18
Meter Overview.................................................................................................................................................................18
Meter Dimensions............................................................................................................................................................19
Step 1: Mounting........................................................................................................................................................................20
Sequence..............................................................................................................................................................................20
Step 2: Voltage and Current Inputs...................................................................................................................................21
Voltage Input......................................................................................................................................................................21
Current Input......................................................................................................................................................................22
Wiring Diagram Using External PTs ........................................................................................................................23
Direct Diagram Using No PTs ....................................................................................................................................26
Step 3: Wire the RS485 Communication ........................................................................................................................29
Step 4: Wire the Power Supply and Ground Terminal .............................................................................................30
Power Supply......................................................................................................................................................................30

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Ground Terminal ...............................................................................................................................................................30
Step 5: Add a Basic Module[DC module].......................................................................................................................31
Step 6: Wire a Basic Module.................................................................................................................................................32
DC Module ..........................................................................................................................................................................32
Step 7: Wire the Power Supply and Ground Terminal of a Basic module .....................................................35
Power Supply......................................................................................................................................................................35
Ground Terminal ...............................................................................................................................................................35
Step 8: Power Up the Meter ..............................................................................................................................................36
Chapter 3 Meter Operation/Setup .............................................................................................................37
Display Mode ...............................................................................................................................................................................37
Setup Mode ..................................................................................................................................................................................40
Reset Mode ...................................................................................................................................................................................42
System Mode................................................................................................................................................................................43
Reactive Calculation Method......................................................................................................................................45
Module Mode ..............................................................................................................................................................................47
Module Display Menu ...................................................................................................................................................47
Module Setup Menu ......................................................................................................................................................48
APPENDIX A Standard Specification..........................................................................................................52
APPENDIX B Standard Compliance............................................................................................................54
APPENDIX C Test Report .............................................................................................................................55
Measuring Test.............................................................................................................................................................................55
Reliability Test...............................................................................................................................................................................56
INDEX.................................................................................................................................................................57

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Figures
Fig 1.1 Front Side.............................................................................................................................................................18
Fig 1.2 Rear Side...............................................................................................................................................................18
Fig 1.3 Basic Module[DC Module] Rear Side .....................................................................................................18
Fig 1.4 Front View............................................................................................................................................................19
Fig 1.5 Rear View..............................................................................................................................................................19
Fig 1.6 Side View..............................................................................................................................................................19
Fig 1.7 ANSI 4” ..................................................................................................................................................................20
Fig 1.8 DIN96 .....................................................................................................................................................................20
Fig 1.9 Voltage and Current Connector ................................................................................................................21
Fig 1.10 Single Phase 2 Wires, Wiring Mode = 1P2U ...................................................................................23
Fig 1.11 Three Phase 3 Wire Open Delta Using 2CTs, Wiring Mode = 3P3O...................................24
Fig 1.12 Three Phase 3 Wire Open Delta Using 3CTs, Wiring Mode = 3P3O...................................24
Fig 1.13 Three Phase 4 Wires Using 3 PTs and 3 CTs, Wiring Mode = 3P4U ...................................25
Fig 1.14 Single Phase 2 Wire Direct , Wiring Mode = 1P2U .....................................................................26
Fig 1.15 Single Phase 3 Wire Direct Using 2 CTs, Wiring Mode = 1P3U ............................................27
Fig 1.16 Three Phase 3 Wire Open Delta Direct, Wiring Mode = 3P3O..............................................27
Fig 1.17 Three Phase 3 Wire Open Delta Direct Using 3 CTs, Wiring Mode = 3P3O ...................28
Fig 1.18 Three Phase 4 Wire Direct Using 3 CTs, Wiring Mode = 3P4U .............................................28
Fig 1.19 Communication Wiring...............................................................................................................................29
Fig 1.20 Wiring of Power Supply and Ground Terminal ...............................................................................30
Fig 1.21 Adding of a Basic Module.........................................................................................................................31
Fig 1.22 DC Module........................................................................................................................................................32
Fig 1.23 DC Voltage/Current ......................................................................................................................................32
Fig 1.24 Digital Input......................................................................................................................................................33
Fig 1.25 DC Relay application ....................................................................................................................................34
Fig 1.26 AC Relay application ....................................................................................................................................34
Fig 1.27 Wiring of Power Supply and Ground Terminal of a Basic module .......................................35
Fig 2.1 Measurement Groups.....................................................................................................................................37
Fig 2.2 P, Q[according to general calculation] ...................................................................................................45
Fig 2.3 DC module channel information..............................................................................................................47
Fig 2.4 DC module rectifier current shunt...........................................................................................................50
Fig 2.5 DC module battery current shunt............................................................................................................50
Fig 2.6 DC module digital input channel 1 of rectifier fault ......................................................................50

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Fig 2.7 DC module digital input channel 2 of rectifier fault ......................................................................50
Fig 2.8 DC module digital input channel 3 of rectifier fault ......................................................................51
Fig 2.9 DC module digital input channel 4 of rectifier fault ......................................................................51
Fig 2.10 DC module digital output channel 1 setup......................................................................................51

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Chapter 1 Introduction
Overview
AC/DC Measurements dedicated to Rectifier
Accura 3550 is a high accuracy digital power meter dedicated to rectifier, suited to power
measurements and DC measurements. In rectifier, the existing customers obtain dc voltage and
current from analog inputs of RTU after converting signals using separate tranducer. The signal
conversion several times deteriorates the overall data reliability, and causes the rising of costs. The
device simply replaces the existing RTU using Tranducer, solving the above two problems.
Accuracy, Power Quality
The measuring accuracy is the most important criterion to evaluate the reliability of energy
management system. Actually low accuracy makes it hard for customers to precisely manage
energy, causing inequality of energy between incoming feeder and sum of load sides. Accura
3550 makes ±0.2% high accuracy measurements for voltage and current, and conforms to
IEC62053-22 class 0.5S for power and energy. This makes it possible to solve the problem with
energy inequality. Furthermore the device provides the information of power qualities, such as
voltage/current THD, harmonic analysis, and k factor.
CE/UL Safety and Reliability
The structure- framework, circuit, fire - of Accura 3550 conforms to safety standard,
CE[IEC61010], UL[UL61010-2, 2nd edition]. Particularly the device provides pass-through busbar,
allowing CT leads to be terminated on the device. This eliminates any possible point of failure at
the device. And optic interface between meter and module essentially disturbs danger of the
existing electrical contacts.

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Features
Measurement
64 Sampling/Cycle True RMS
IEC 62053-22 Class 0.5S
50, 60Hz
Phase voltage, line to line voltage, current
Power, energy, power factor, frequency
Fundamental component, True RMS of current
4 Quadrant Power
Demand, peak demand†
Maximum, Minimum†
Power Quality
Voltage/current THD
Harmonic Analysis†
K factor†
†It is available only on 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
Baudrate: 1,200 ~ 57,600bps
Power Supply
AC 85 ~ 265V, 50/60Hz
DC 100 ~ 300V
Burden: 10VA

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Applications
Measurements dedicated to Rectifier
Rectifier panel guarantees reliability of control power in energy system during the interruption of
power. Accura 3550 is a high accuracy digital power meter dedicated to rectifier, suited to power
measurements, DC measurements, and rectifier status.
True RMS Measurements robust to harmonics
Most of energy environments consist of nonlinear loads, such as industrial load, rectifier, power
electronic device, electric furnace and etc. this causes fatal distortion of voltage and current
waveforms. Accura 3550 makes high accuracy True RMS measurements for voltage and current
distorted with harmonics.
Power Quality Analysis
Accura 3550 provides k factor, analysis of voltage and current up to 31st harmonic, and realtime
waveform of voltage and current.
Compatibility with Analog Meters
Accura 3550 mounts directly in ANSI C39.1[4” Round] or DIN 96. this is perfect for new
installations and for existing panels. In new installations, simply use existing DIN or ANSI punches.
For existing panels, pull out old analog meters and fit the device in its cutout.
High Reliability Energy Management
The most important point to evaluate the overall data reliability of energy management is the
accuracy of meters. Accura 3550 makes ±0.2% high accuracy measurements for voltage and
current, and conforms to IEC62053-22 class 0.5S for power and energy. Energy management
gives customers various services, monitoring, cost curtailment, demand, energy planning, rectifier
management and etc.

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Parameters
Realtime
1
Average
2
Total
3
Maximum
4
Minimum
5
Phase voltage ■■■
*■ *
Line to line voltage ■■■
*■ *
Current ■■■
*
Power Active ■■■
*
Reactive ■■■
*
Apparent ■■■
*
Energy Active ■
Reactive ■
Apparent ■
Frequency ■
Power factor ■■
THD Voltage ■
Current ■
Demand Voltage ■
*■ *
Current ■
*■ *
DC Voltage ■
Current ■
1Instaneous measuring. 2Average of three phase parameters. 3Total sum of three phase parameters.
4If realtime measurements exceed maximums, the maximums will be updated, the measurements being
ignored within 10msecs after power up.
5If realtime measurements is less than minimums, the minimums will be updated, the measurements being
ignored within 10msecs after power up.
*It is available only on RS485 communication
Note
The Maximums and minimums will not be updated with no power-up.

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Chapter 2 Mounting
Environmental Conditions
The Accura 3550 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
Items Acceptable Range
Position Indoor use
Operating Temp -20 ~ 70°C[-4℉~ 158℉]
Storage Temp -40 ~ 85°C[-40℉~ 185℉]
Operating Humidity 5 ~ 95% Non condensing
Enclosure Considerations
The enclosure the Accura 3550 is mounted in (typically a switchgear cabinet) should protect the
device from atmospheric contaminants such as oil, moisture, dust, and corrosive vapors, or other
harmful airborne substances. The mounting enclosure should be positioned such that the doors
may be opened fully for easy access to the Accura 3550 wiring and related components to allow
for convenient troubleshooting.
Warning
T
he 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.
Danger
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]
Fig 1.7 ANSI 4”Fig 1.8 DIN96
Note
The meter is mounted on switchgear boards (metal cabinet) in electrical facilities.