ROOTECH Accura 3550S User guide

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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.)

6 Energy 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.

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ROOTECH Accura 3550S User guide

ROOTECH Accura 3550S User guide

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