Accuenergy AcuDC 243-300V-A0-P2-C-D, AcuDC 243-1000V-A2-P1-X5-C, AcuDC 243-1000V-A0-P1-C-D, AcuDC 243-1000V-A2-P1-X5-C-D, AcuDC 243-1000V-A0-P1-C User manual

User's Manual

ACUDC 240

DC POWER & ENERGY METER

AcuDC 240 Series Power and Energy Meter

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ABOUT ACCUENERGY

Formed in 1998, Accuenergy is a leading producer of power and energy metering
products for the distribution, control and management of electrical energy and other
dynamic processes. Accuenergy’s vision is to make energy usage more dependable and
efficient, and to make energy management more convenient and intelligent. Accuenergy
products are easily integrated into new and existing energy management, automation
and building control systems for intelligent and user-friendly energy systems and are
backed by an industry-leading pre and post sale technical support and manufacturer’s
warranty.

With an emphasis on continuous improvement, innovation and high performance and
cost-effective solutions, Accuenergy has developed a growing global footprint with offices
in Toronto Canada (Headquarter), Los Angeles and Beijing.

WARNINGS GLOSSARY

The following symbols in this manual and on AcuDC 240 series meters are used to provide
warning of danger or risk during the installation and operation of the meters.

Electric Shock Symbol: Carries information about procedures which
must be followed to reduce the risk of electric shock and danger to
personal health.

When this symbol is seen on the meter, consult this user manual. Refer
to Chapter 2 for important safety information regarding mounting and
wiring of the AcuDC meter.

Safety Alert Symbol: Carries information about circumstances which if
not considered may result in injury or death.

Note: Please read this manual carefully before installation, operation and maintenance of
an AcuDC 240 series meter.

Installation and maintenance of the AcuDC 240 meter should only be performed
by qualified, competent professionals who have received training and should have
experience with high voltage and current devices.

ACCUENERGY shall not be responsible or liable for any damages caused by improper
meter installation and/or operation.

IV

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TABLE OF CONTENTS

CUSTOMER SERVICE AND SUPPORT .....................................................................II

PRODUCT WARRANTY .................................................................................................III

CHAPTER 1: Introduction to the AcuDC ................................................................1

1.1 Package Contents & Available Accessories ..............................................1

1.2 Introduction and Compliance ......................................................................1

1.2.1 Introduction ........................................................................................................................1

1.2.2 Compliance ........................................................................................................................2

1.3 Applications & Industries ................................................................................2

1.4 Features & Specifications ...............................................................................3

1.4.1 Features .................................................................................................................................3

1.4.2 Specifications ....................................................................................................................3

CHAPTER 2: Installation - Physical Setup............................................................7

2.1 Tools .........................................................................................................................7

2.1.1 Tools for Mounting ..........................................................................................................7

2.1.2 Tools for Wiring ................................................................................................................7

2.2 Mounting ..............................................................................................................7

2.2.1 Tools for Mounting..........................................................................................................8

2.2.2 Mounting I/O Modules Onto Meter ......................................................................9

2.3 Wiring .......................................................................................................................................12

2.3.1 Wiring Control Power ....................................................................................................13

2.3.2 Current Input Wiring ....................................................................................................14

2.3.3 Voltage Input Wiring ....................................................................................................16

2.3.4 Current & Voltage Wiring at the Same Time ...................................................17

2.3.5 Communications Wiring .............................................................................................20

2.4 Removing meter for servicing or maintenance ...................................21

CHAPTER 3: Installation - Configuration Parameter Set-up via display .............24

3.1 Display Panel and Keys ....................................................................................24

3.2 General Parameter Setup ...............................................................................25

3.2.1 Key’s Function in parameters setup .....................................................................26

3.2.2 Configure AcuDC to work with Shunt.................................................................26

3.2.3 Configure AcuDC to work with Current Hall Effect Sensor .....................27

3.2.4 Configure AcuDC to work with Current and Voltage Hall Effect Sensor

28

3.2.5 Clear Energy, Ah and DI Counter ...........................................................................29

V

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3.2.6 Set Backlight Brightness ............................................................................................30

3.2.7 Meter Clock Setting ......................................................................................................30

3.2.8 Password Setting ............................................................................................................31

3.3 AcuDC Communication Setup .....................................................................31

3.4 I/O Parameter Setup.........................................................................................32

3.4.1 Meter Clock Setting .......................................................................................................32

3.4.2 RO parameter setting ..................................................................................................34

CHAPTER 4: Viewing Metering Parameters – VIA Display ............................40

4.1 General Display on the AcuDC ......................................................................40

4.2 View the Meter and Load Running Time .................................................43

4.3 View the serial number from the meter ..................................................44

CHAPTER 5: Viewing Real-time Readings Via AcuView Software ...........46

5.1 Connection Setup ..............................................................................................46

5.1.1 Wiring .....................................................................................................................................46

5.1.2 Acuview Software Setup .............................................................................................46

5.2 Configuration Parameters Setup ................................................................49

5.2.1 General Meter Parameter Setting ..........................................................................49

5.2.2 Configure the Data Log using the meter’s onboard memory ...............51

5.2.3 Configure the data log to log the readings on the computer’s memory

53

5.3 Viewing Metering Parameters ......................................................................56

5.3.1 Real-Time Metering .......................................................................................................56

5.3.2 Reading Data Log on Meter’s Onboard Memory ..........................................57

5.3.3 Reading Data Log on the computer’s memory .............................................58

APPENDIX ..........................................................................................................................60

A. Troubleshooting ..................................................................................................60

B. Modbus Register Map ........................................................................................63

B.1 MODBUS-RTU Protocol ...................................................................................................63

B.2 Communication Format ................................................................................................66

B.3 AcuDC240 Communication Address Table .........................................................71

C. Ordering Information ........................................................................................83

D. Glossary of Definitions ......................................................................................84

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AcuDC 240 Series

DC Power and Energy Meters

Chapter 1: Introduction to AcuDC

1.1 Package Contents + Available
Accessories

1.2 Introduction and Compliance

1.2.1 Introduction

1.2.2 Compliance

1.3 Applications & Industries

1.4 Features & Specifications

1.4.1 Features

1.4.2 Specifications

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Chapter 1: Introduction to AcuDC

CHAPTER 1: INTRODUCTION TO THE ACUDC

1.1 Package Contents & Available Accessories

When you open the package, you will find the following items:

1. AcuDC 240 Meter X1

2. Terminal Blocks X1 - X3 (Depending on model)

3. Installation Clips X4 (Already assembled to the meter)

Available Accessories:

I/O modules (Combinations of digital I/O, analog I/O and relay output)

Current transformers

USB to Serial Converters

1.2 Introduction and Compliance

1.2.1 Introduction

Powerful Yet Cost-Effective

AcuDC 240 series monitors DC voltage, current, power and energy. It supports bi­directional current measurement, and also displays meter running hour and load running
hour. Analog Output applies to DCS system, industrial monitoring and control. AcuDC
240 has a combination of accurate measurement, intelligent multifunction and simple
human machine interface. The cost-effective meter fulfills the requirements of monitoring
and controlling the DC circuit.

Compact and Easy to Install

The dimensions of AcuDC 240 series meet DIN 72X72 requirements. With a mounting
depth of 65mm, the meter can even fit in small drawer type cabinets. It utilizes a self-lock
installation mechanism, eliminating the necessary of fix bolts, which makes installation or
removal quick and convenient.

User Friendly Interface

AcuDC 240 series utilizes a clear high-definition LCD screen with large characters. The
LCD screen comes with a brightness adjustable backlight, which ensures easy observation
of metering data in any environment. With a large LCD screen display, the two keys on the
meter from allow users to observe multiple parameter data at the same time. The meter
parameter settings can be set either via front panel keys or the communication port. The
Parameter settings are saved in the non-volatile EEPROM, which remains when power is
off.

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AcuDC 240 Series

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DC Energy & Power meters

High Safety and Reliability

AcuDC 240 series meter was designed according to industrial standards. It can run
reliably under high power disturbance conditions. This meter has been fully tested for
EMC and safety compliance in accordance with multiple international standards. The
casing is highly fire resistant due to high quality, durable engineering plastics.

1.2.2 Compliance

The following table lists the compliances this meter meets:

Safety

Quality Control

Environmental

1.3 Applications & Industries

Conforms to UL Std 61010-1
Certified to CSA Std C22/2 No. 61010-1

CE certified.

Certified to ISO 9001:2008 standard

IEC 60068-2; Nema3 Certified

IP54 Certified

Applications:

• DC meter & metering

Metering of DC consumption and generation of different DC electrical systems

• DC transducer

Installed transducer reads power, energy, voltage, current and amp hour data and
outputs digital pulse and/or analog signals

• DC data logger / data logging
Installed meter reads, records and stores power, energy, voltage, current and amp
hour data for subsequent download, reporting and analysis

Industries:

• Renewable energy & green systems

Generation by solar photovoltaic (PV) arrays, wind turbines, inverter & battery
monitoring, DC consumption of electric vehicle (EV) charging stations

• Transportation Systems

Consumption of rail / railway, subway and trains and transit systems and related DC
equipment

• Telecommunications

Consumption on cell / cellular towers and equipment

• Datacenters

Consumption of data centers and equipment

2

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Chapter 1: Introduction to AcuDC

1.4 Features & Specifications

1.4.1 Features

DC power system metering;

Monitor and control power switches;

Alarming and analog output;

Standard 72x72mm, allows for drawer type panel installation;

Three line high-definition LCD display;

Accessible with SCADA, PLC systems;

Easy installation, simple wiring;

Data Logging: Offers 3 configurable historical logs where the all of the metering
parameters can be recorded. The onboard memory is up to 4 MB and each log size is
adjustable.

1.4.2 Specifications

The following tables list the specifications of AcuDC 240 meter.

Parameter Accuracy Resolution Range

Voltage 0.2% 0.001 V 0~1200 V

Current 0.2% 0.001 A 0~±50000 A

Power 0.5% 0.001 kW 0~±60000 kW

Energy 0.5% 0.01 kWh 0~9999999.99 kWh

Drift with
Temperature

Stability 0.5‰/year

Voltage

Input Range

Voltage Direct Input0~1000V; Via Hall Effect Sensor0~1200V

Input Impedance 2MΩ

Load <0.6W

Accuracy 0.2%

<100ppm / °C

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3

AcuDC 240 Series

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DC Energy & Power meters

Voltage

Current

Input Range

Shunt 50~100mV(programmable)

Hall Effect Sensor 0~±5V/0-±4V, 4~20mA/12mA±8mA

Power Consumption 2W(MAX)

Accuracy 0.2%

Digital Input

Type Dry Contact

Isolation Voltage 2500Vac

Environment

Operation Temperature -25°C ~ +70°C

Storage Temperature -40°C ~ +85°C

Humidity 5%~95%Non-condensing

0~±10A(Direct Input, pick up current 0.01A)

0~±50000A(Via Shunt or Hall Effect Sensor, program-

mable range)

Output

Relay Output (RO)

Type Mechanical contact, Form A

Max Load Voltage 250Vac/30Vdc

Max Load Current 3A

On Resistance 100mΩ (Max)

Isolation Voltage 4000Vac

Mechanical Life 5 × 106 times

Digital Output (Photo-Mos)

Load Voltage Range 0~250Vac/dc

Load Current 100mA(Max)

Max Output Frequency 25Hz, 50% duty cycle

Isolation Voltage 2500Vac

Analog Output (AO)

Load Voltage Range 4-20mA/0~20mA; 0~5V/1-5V

Load Current 0.5%

Max Output Frequency

Current type, max load resistance: 750 Ohm Voltage

type, max load current: 20 mA

4

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Chapter 1: Introduction to AcuDC

Communication

Type RS485, half duplex, Optical Isolated

Protocol Modbus-RTU

Baud Rate 1200~38400bps

Isolation Voltage 2500VAC

Power Relay Supply

Input

Consumption 3W (typical value)

72 x 72 mm Panel mounted

Table 1-3 lists the functions of AcuDC240 series.

Table 1-3 AcuDC 240 Series

Function AcuDC 241 AcuDC 242 AcuDC 243

Voltage V

Current I

Metering

I/O

Power P

Energy E

Ampere

-Hour

2DI+2AO

2DI+2RO

2DI+2DO

2DI+ ±15Vdc

Ah

Support DI

Count

(P1)100-240Vac, 50/60Hz, 100-300Vdc

(P2) 20-60Vdc

Installation

• •

○ ○ ○

○ ○ ○

○ ○ ○

○ ○ ○

• •

•

•

•

All metering parameters can
be recorded (Voltage, Current,

Data Logging

Communication RS485, Modbus RTU

Display LCD

Dimensions

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Power, Energy, Ampere-hour, DI
Count); Interval 1 minute; Can
record 4 months

○

○ ○ ○

• • •

72×72×64.5mm (Cutout: 68x68 mm) / 2.835 x 2.835 x 2.539 inch (Cutout:

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2.677 x 2.677 inch)

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5

AcuDC 240 Series

DC Power and Energy Meters

Chapter 2: Installation - Physical Setup

2.1 Tools

2.1.1 Tools for Mounting

2.1.2 Tools for Wiring

2.2 Mounting

2.2.1 How to choose installation place

2.2.2 Mounting I/O modules onto meter

2.2.3 Mounting meter onto switchboard panel

2.3 Wiring

2.3.1 Wiring Control Power

2.3.2 Current input wiring

2.3.3 Voltage input wiring

2.3.4 Current & Voltage wiring at the same time

2.3.5 I/O Module wiring

2.3.6 Communications wiring

2.4 Removing meter for servicing or

maintenance

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Chapter 2: Installation - Physical Setup

CHAPTER 2: INSTALLATION - PHYSICAL SETUP

2.1 Tools

2.1.1 Tools for Mounting

• #2 Flathead Screwdriver

• Wire Cutters

2.1.2 Tools for Wiring

• A 1A/250Vac circuit breaker for the auxiliary power supply loopWire Cutters

• A 1A/250Vac circuit breaker should be used in the voltage input loop.

• Choice of wire of power supply is AWG22-16 or 0.6-1.5mm

• The wire for voltage input is AWG16-12 or 1.3-2.0mm

• The wire size of current input is AWG15-10 or 1.5-2.5mm

The following may be required:

• If using RS485 for communication, use a good quality shielded twisted pair cable,

AWG22 (0.5mm2) or higher

• The wire of digital input should be chosen between AWG22~16 or 0.5~ 1.3mm

• The wire of relay output should be chosen between AWG22~16 or 0.5~1.3mm

• The wire of the digital output circuit should be chosen between AWG22~16 or 0.5~1.3

2

mm

2

2

2

2

2

2.2 Mounting

Considerations When Installing Meters

• Installation of the meter must be performed by qualified personnel only, and should

follow standard safety precautions through the installation procedures. Those

personnel should have appropriate training and experience with high voltage devices.

Appropriate safety gloves, safety glasses and protective clothing are recommended.

• During normal operation, dangerous voltage may be present in many parts of the

meter, including terminals, and any connected I/O (Inputs and Outputs) modules and

their circuits. All primary and secondary circuits can, at times, produce lethal voltages.

AVOID contact with any current-carrying surfaces.

• The meter and its I/O output channels are NOT designed as primary protection

devices and shall NOT be used as primary circuit protection or in an energy limiting

capacity. The meter and its I/O output channels can only be used as secondary

protection. AVOID using the meter under situations where failure of the meter may

cause injury or death. AVOID using the meter for any application where risk of fire

may occur.

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AcuDC 240 Series

• All meter terminals should be inaccessible after installation.

• Applying more than the maximum voltage the meter and/or its modules can

withstand will permanently damage the meter and/or its modules. Please refer to the

specifications in section 1.4.1 for all devices before applying voltages.

DC Energy & Power meters

NOTE: If the equipment is used in a manner not specified by the

Alert

Alert

Alert

manufacturer, the protection provided by the equipment may be
impaired.

NOTE: There is no required preventive maintenance or inspection
necessary for safety. However, any repair or maintenance should be
performed by the factory.

DISCONNECT DEVICE: The following part is considered the equipment
disconnect device.

A switch or circuit- breaker shall be included in the installation.
The switch shall be in close proximity to the equipment and within
easy reach of the operator. The switch shall be marked as the
disconnecting device for the equipment.

2.2.1 Tools for Mounting

Note: Before installation, please check the environment, temperature and humidity to
ensure the AcuDC 240 series meter is being placed in a proper place.

1. Temperature

AcuDC 240 operation temperature is -25°C ~ 70°C, which will accommodate most user

Please Note: It can influence the meter life negatively if the meter operates under
extremely high or extremely low temperature environments. AcuDC 240 storage
temperature is -40°C ~ 85°C.

2. Humidity
5% to 95% non-condensing

3. Location

AcuDC 240 series meter should be installed in a dry and dust free environment. Avoid
exposing meter to excessive heat, radiation and high electrical noise sources.

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Chapter 2: Installation - Physical Setup

2.2.2 Mounting I/O Modules Onto Meter

If the meter is equipped with an I/O module, you need to mount the module onto meter
before installing the meter.

Installation Method

With the link pins, I/O module is linked to the meter.

1. Insert the mounting clips to the counterpart of AcuDC 240 meter, and then press the
I/O module lightly, so linking is established, as shown in Fig 2-2.

(A)

(B)

(C)

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(D)

9

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AcuDC 240 Series

2. Tighten the installation screws.
Note: Install I/O Module carefully to avoid damage; under no circumstances should any
installation be done with the meter powered on. Failure to do so may result in injury or
death.

2.2.3 Mounting Meter Onto Switchboard Panel

Appearance and Dimensions

DC Energy & Power meters

Fig 2-3 AcuDC 240 Appearance

Table 2-1 Part Name of AcuDC 240

Part Description

1. Casing High intensity fire resistant engineering plastics

2. Front Casing Visible portion after mounting onto a panel

3. Display Large LCD display

4. Key Two keys are used to select display and set

5. Voltage and Current Input Terminals Used for voltage and current input

6. Communication Terminals Communication output

7. I/O Module Optional I/O module

8. I/O Terminal Optional I/O terminals, including 2DI, 2AO/2RO

9. Power Supply Terminal Power supply terminal

10. Installation Clips Used for securing the meter to the panel

Fig 2-4 AcuDC 240 Dimensions

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Chapter 2: Installation - Physical Setup

Installation Steps

AcuDC 240 series meter is generally installed into the switchboard panel.

1. Cut a square hole (Standard DIN). See figure 2-5 for dimensions. Unit:mm

Fig 2-5 Panel Cutout

2. Remove the clips (10) from the meter, and insert the meter into the square hole from
the front side, as shown in following figures.

a. Panel Cutout

c. Putting back the Clips at the back

of the Panel

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b. Inserting the Meter to the Panel

Square Hole

d. Installation Completed

11

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AcuDC 240 Series

2.3 Wiring

Terminal Strips

There are 3 groups of current terminal strips. There will be another terminal strip if the
meter is connected with the I/O module.

DC Energy & Power meters

a. Voltage and Current Terminal Strip

c. I/O Terminal Strip (2DI+2AO)

e. I/O Terminal Strip (2DI+±15V)

Fig 2-7 AcuDC 240 Terminal Strip

Safety Earth Connection

b. Power Supply Terminal Strip

d. I/O Terminal Strip(2DI+2RO/2DO)

f. Communication Terminal Strip

Before setting up the meter’s wiring, please make sure that the
switchgear has an earth ground terminal. Connect both the
meters and the switchgear’s ground terminal together.

This ground terminal symbol is used in this user’s manual.

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Chapter 2: Installation - Physical Setup

2.3.1 Wiring Control Power

CAUTION: Make sure you check the power supply option you have before energizing the
meter. Check the silver sticker on the side of the meter to confirm what power supply
option you have.

The silver sticker on the side of the meter contains information such as the model
number, power supply, voltage/current inputs and serial number.

To power the meter, you need to connect the power supply terminal as shown below.

This will be connected based on the two power supply options available, that is:

1A FUSE

Power Supply

L/+

11

12

N/-

AcuDC 240

13

G

Fig 2-9 Power Supply Wiring

1. The Standard option: 100-240Vac, 50/60Hz or 100-300Vdc

2. The Low Voltage DC option: 20-60Vdc

The independent power supply circuit loop must have a fuse or air circuit breaker. The
fuse could be 1A/250Vac, time delay type. If circuit breaker is used, a CE certified product
with compliance of IEC947 is recommended.

Terminal G (13) must be connected to the ground for the safety.

An isolated transformer or EMC filter should be used in the auxiliary power supply loop if
power quality problem exists in the power supply, as shown in following figure.

Power Supply

1A FUSE

L

L

N

N

G

G

11

12

13

L/+

N/-

AcuDC 240

G

EMC lter

2-10 Power Supply Wiring with EMC Filter

Choice of wire power supply is AWG16-22 or 0.6-1.5 mm

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2

.

13

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AcuDC 240 Series

2.3.2 Current Input Wiring

AcuDC 240 meter current can be wired in three different ways: direct wiring, wiring using
a shunt and wiring using a current Hall Effect sensor.

NOTE: When wiring using a shunt or Hall Effect Sensor these must be wired on the
negative terminal of the load that is being measured.

Choice of wire current input is AWG15-16 or 1.5-2.5 mm2 or equivalent resistance wire.

DC Energy & Power meters

Vdc+Vdc-

Meter

I/O terminal strip

2423222120191817

V+GNDV-NCDI22DI21DI12DI11

shunt

Voltage, Current, Terminal Strip

Fig 2-11a Wiring using a Shunt

Meter

I/O terminal strip

Voltage, Current, Terminal Strip

123456

U+NCU-NCI+I-

Load

Vdc-

2423222120191817

V+GNDV-NCDI22DI21DI12DI11

123456

U+NCU-NCI+I-

Vdc+

Load

Fig 2-11b Direct Wiring

14

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Meter

I/O terminal strip

Voltage, Current, Terminal Strip

Fig 2-11 C Wiring using a Hall Effect Sensor

Chapter 2: Installation - Physical Setup

Hall Eect Sensor

2423222120191817

V+GNDV-NCDI22DI21DI12DI11

123456

U+NCU-NCI+I-

Fig 2-11 Current Input Wiring

Hall Eect Sensor Terminal

Vdc+Vdc-

Current

1

2

3

4

Load

Table 2-2 Accuenergy Line of Shunts/Hall Effect Sensors for Measuring Current

(Works with AcuDC 243 A1 Current Input Option)

Shunt

Rated Input: 50A

Output: 75mV

Rated Input: 100A

Output: 75mV

Rated Input: 200A

Output: 75mV

Rated Input: 500A

Output: 75mV

Rated Input: 1000A

Output: 75mV

Rated Input: 1500A

Output: 75mV

Rated Input: 2000A

Output: 75mV

(Works with AcuDC 243 A2 Current Input Option)

Hall Effect Sensor

Rated Input: 50A

Output: 4-20mA

Window Size: 21mm

Rated Input: 100A

Output: 4-20mA

Window Size: 21mm

Rated Input: 200A

Output: 4-20mA

Window Size: 21mm

Rated Input: 400A

Output: 4-20mA

Window Size: 40mm

Rated Input: 600A

Output: 4-20mA

Window Size: 40mm

Rated Input: 1000A

Output: 4-20mA

Window Size: 40mm

NOTE: For measuring higher currents or larger window size openings, please

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AcuDC 240 Series

Vdc+

2.3.3 Voltage Input Wiring

AcuDC 240 series meter Voltage can be wired in two different ways: direct wiring and
wiring using a voltage Hall Effect sensor. Choice of wire for the voltage input is AWG16-22
or 0.6~1.5 mm

DC Energy & Power meters

2

. Please see the wiring diagrams for details as shown in fig 2-12.

Meter

Vdc-

I/O terminal strip

Voltage, Current, Terminal Strip

Fig 2-12a Wiring using a Voltage Hall Effect Sensor

Meter

I/O terminal strip

Hall Eect Sensor

2423222120191817

V+GNDV-NCDI22DI21DI12DI11

+

­IN-

M

123456

U+NCU-NCI+I-

IN+

T

Vdc+Vdc-

2423222120191817

V+GNDV-NCDI22DI21DI12DI11

Voltage, Current, Terminal Strip

123456

U+NCU-NCI+I-

Load

Fig2-12b-Direct Wiring

Fig2-12-Voltage Input Wiring

16

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Chapter 2: Installation - Physical Setup

2.3.4 Current & Voltage Wiring at the Same Time

You can wire the voltage and current for different systems based on the different
methods above. Here are the common wiring methods used:

1. Direct voltage connection and a direct current connection see 2-13a.

2. Direct voltage connection and a current connection using a shunt see 2-13b.

3. Direct voltage connection and a current connection using a current Hall Effect sensor
see 2-13c.

The different wiring diagrams are shown below:

Meter

I/O terminal strip

Voltage, Current, Terminal Strip

Fig 2-13a Direct Wiring

Meter

I/O terminal strip

Vdc+Vdc-

2423222120191817

V+GNDV-NCDI22DI21DI12DI11

123456

U+NCU-NCI+I-

Load

Vdc+Vdc-

2423222120191817

V+GNDV-NCDI22DI21DI12DI11

shunt

Voltage, Current, Terminal Strip

123456

U+NCU-NCI+I-

Load

Fig 2-13b Voltage and Current Wiring Using a Shunt

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AcuDC 240 Series

Voltage, Current, Terminal Strip

DC Energy & Power meters

Meter

Hall Eect Sensor

I/O terminal strip

2423222120191817

V+GNDV-NCDI22DI21DI12DI11

1

2

3

123456

U+NCU-NCI+I-

Fig 2-13c Voltage and Current Wiring Using Current Hall Effect Sensor

4

Load

Vdc+Vdc-

Meter

I/O terminal strip

Voltage, Current, Terminal Strip

Fig 2-13 d Voltage and Current Wiring Using Hall Effect Sensors

Fig 2-13-Typical Voltage and Current wiring diagram for systems

Hall Eect Sensor

Voltage

Hall Eect Sensors

+

­IN-

M

2423222120191817

IN+

T

Vdc+Vdc-

V+GNDV-NCDI22DI21DI12DI11

1

2

3

123456

U+NCU-NCI+I-

4

Current

Hall Eect Sensors

Load

18

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Chapter 2: Installation - Physical Setup

Digital Input

AcuDC 240 optional I/O module is equipped with two dry contact digital inputs. The
terminals are (17), (18), (19) and (20), as shown in figure 2-7. The Circuit is simplified as:

When the switch is open, there is no current flowing into the diode side of the optical
coupler, the triode is off, OUT is in low state. When the switch is closed, there is current
flowing into the diode side, the triode is on, OUT is in high state. In this way, the ‘high’ and
‘low’ state of OUT corresponding to ‘closed’ and ‘’open’ state of the switch.

The I/O module has built in power supply therefore the digital input does not require an
external power supply.

2

DI wire may choose AWG22-16 or 0.5-1.5 mm

Analog Output

AcuDC 240 I/O module offers two Analog Output modes, which are the current output
0-20mA/4-20mA(max 24mA) mode, and the voltage output 0-5V/1-5V(max 6V) mode, as
shown in figure 2-15.

NOTE: Each module can only has one type of output, please specify when ordering.

.

Fig 2-15 Analog Output Wiring

19

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AcuDC 240 Series

Relay Output

The AcuDC 240 series I/O option has two relay outputs, which are terminal (21), (22) and
(23), (24) as shown in Fig 2-7. They can be used to remotely control circuit breakers.

The relay outputs are form A (normally open) electromagnetic relay. The nodal capacity is
3A/250 Vac or 3A/30Vdc. If the coil current is high, a medium relay is recommended.

DC Energy & Power meters

2.3.5 Communications Wiring

AcuDC 240 series meter uses RS485 serial communication and the Modbus RTU protocol.
The terminals of communication are A, B and S (14, 15 and 16). A is differential signal +, B is
differential -, and S is connected to the shield of twisted pair cable. The overall length of
the RS485 cable connecting all devices cannot exceed 1200m (4000ft). Utilizing a large
number of RS485 devices and utilizing a high baud rate will make the communication
range shorter. AcuDC 240 works as a Slave device. Master device can be PC, PLC, Data
Acquisition Device, or RTU.

Suggestions to improve communication quality:

A high-quality Shielded Twisted Pair cable, AWG22(0.6mm2) or larger diameter cable, is
recommended. Two cables should be in different colors.

• Pay attention to ‘single point earthling’. Make sure that there is only one point of the

shielding connected to ground in a single communication link.

• Every terminal A(+) should be connected to terminal A(+), terminal B(-) to terminal B(-

), or it will influence the network, or even damage the communication interface.

• The connection topology should avoid ‘T’ type which means there is a new branch

and it does not begin from the beginning point.

• Keep communication cables away from sources of electrical noise whenever possible.

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Chapter 2: Installation - Physical Setup

When using a long communication cable to connect several devices, an anti signal
reflecting resistor (typical value 120Ω-300 Ω/0.25W) is normally added to the end of the
cable beside the last meter if the communication quality is distorted.

Use RS485 converter with optical isolated output and surge protection.

RS485 Converter

VCCGNDRDX-RDX+T/R-T/R+

Fig 2-17 Communications Wiring

Communication

Terminal Block

S

Meter

16

15

14

2.4 Removing meter for servicing or maintenance

Power Supply Inputs

The wires carrying power into the AcuDC 240 meter must be de-energized regardless of
whether the meter is powered by an independent source or by the measured load line.
De-energize the wires by turning off the switchgear (disconnect switch, breaker or fuse)
leading to the terminal block for pins 11 through 13. The terminal block can then be safely
removed.

NOTE: Removing the terminal block without turning off the
switchgear switch may expose the operator to visible/bare wires
that are still connected to dangerously high voltage levels. This
may cause injury or death.

Voltage Inputs

1. Preparing for Safe Removal
De-energize the leads into the voltage pins by turning off the switchgear.

NOTE: Removing the voltage leads without turning off the
switchgear will expose the operator to dangerously high voltage
levels. This may cause injury or death.

2. Disconnecting the Voltage Inputs
Using a #2 flathead screw driver, turn each of the screws on pins 1 and 3 counter­clock wise. Stop turning when the wires can be easily removed from their
housing.

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AcuDC 240 Series

Current Inputs

1. Preparing for Safe Removal
If the meter was wired directly in series to the current carrying lines without the use of a
shunt/Hall effect sensor then the operator must de-energize the circuit before removing
the circuit wires from the AcuDC meter.

2. Disconnecting the current inputs
Using a #2 flat head screw driver, screw driver, turn the screws on pins 5 and pin 6
counter-clock wise. Stop turning when the wire can be easily removed from its housing.

Cleaning the Meter

ACCUENERGY recommends using a dry cloth to wipe the meter.

DC Energy & Power meters

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AcuDC 240 Series

DC Power and Energy Meters

Chapter 3: Installation - Configuration

parameter set-up via display

3.1 Display panel and keys

3.2 General parameter setup

3.2.1 Key’s function in parameters setup

3.2.2 Configure AcuDC to work with shunt

3.2.3 Configure AcuDC for current
hall effect sensor

3.2.4 Configure AcuDC for current and
hall effect sensor

3.2.5 Clear energy Ah and DI counter

3.2.6 Set backlight brightness

3.2.7 Meter clock setting

3.2.8 Password setting

3.3 AcuDC Communication Setup

3.4 I/O Parameter Setup

3.4.1 AO parameter setting

3.4.2 RO parameter setting

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AcuDC 240 Series

CHAPTER 3: INSTALLATION - CONFIGURATION PARAMETER

SET-UP VIA DISPLAY

3.1 Display Panel and Keys

The front of the AcuDC 240 series meter consists of an LCD screen and two control keys.
All the display segments are illustrated in Fig 3-1. Users should note that all the segments
will not display in a single page under normal conditions.

There are two keys on the front panel, marked as ‘F’ key and ‘V/A’ key, which are used to
display different parameter data and parameter settings.

DC Energy & Power meters

4

SET

1

2

1

kV
kA
kW
MW

2

3

Number Display Description

1

2

3

kV, kA, kW, MW, Hz, kvar, Mvar, kVA, MVA,

3

Fig 3-1 All Display Segments

kWh, kvarh, kVAh

kWh

Display data of voltage, current, power and
energy

Data Unit

No Icon: no communication
One icon: query sent
Two icons: query sent and response re­ceived

4

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Setting mode: Indicates the meter is in
Setting Mode

V: 1.0 Revised: Jan. 2018

Chapter 3: Installation - Con󳆂guration Parameter Set-up

3.2 General Parameter Setup

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering display mode to get to the
system parameter setting mode. In parameter setting mode, pressing ‘F’ and ‘V/A’
simultaneously will exit the system parameter setting mode and return to the metering
data mode.

General parameter setup will define the general operating characteristics, such as current
range setting, shunt current output range setting, rated voltage of voltage Hall Effect
sensor, reset energy, Ah and DI counter, meter clock setting, and password reset etc., as
shown in table 3-2.

NOTE: Some of these settings will vary depending on the model number and firmware
version of the meter.

Label Paramters Default Options Description Note

Communication

parameter setup

Shunt/Hall Effect

Sensor Parameter

Setup

Hall Effect Sensor

Setup

Energy, Ah and

DI counter clear

setup

Communica-

tion address

Baud Rate 19200

Parity Non1

Current input

of the shunt

/ hall effect

sensor

Current

output of the

shunt

output range

of the current

Hall Effect

Sensor

rated voltage

of the Voltage

Hall Effect

Sensor

output range
of the voltage

Hall Effect

Sensor

Energy

delete(energy

clear)

1 1 ~ 247

1200;
2400;
4800;

9600;
19200;
38400

even;

odd;
non1;
non2

20

100

0 0; 1

0 0; 1

NO

20 ~

50000A

50 ~

100mV

0 ~ 3000V

NO;

Yes

The address can

be any integer

between 1~247

Data Transmission

Rate

0: 4~20mA/0~±5V

1:

4~12-20mA/0~±4V

0: 0 ~ ±5V;

1: 0 ~ ±4V

No: energy not

cleared;

Yes: clear energy

to 0

Assign different ad-

dresses to meters on

same bus

All devices on the

same communica-

tion bus must use the

same baud rate

All devices on the

same communica-

tion bus must use the

same parity

Only indirect current

measurement has this

screen

Corresponds to the

output range of the

shunt

Only meter with indi-

rect voltage measure-

ment has this screen.

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AcuDC 240 Series

DC Energy & Power meters

Label Paramters Default Options Description Note

Energy, Ah
and DI count­er clear setup

Brightness

Setup

Meter Clock

Setup

Password

Setup

DI counter

delete(DI

counter clear)

Backlight

brightness

Date 1 ~ 31

Time 0 ~ 59 24-hour clock

Password 0000

NO

5 1 ~ 5

NO;

Yes

4

Digitals

No: means DI

counter not

cleared DI;

Yes: clear DI

counter to 0

1: minimum light

level;

5: maximum light

level

Year/month/ date

3.2.1 Key’s Function in parameters setup

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering display mode to get to the
system parameter setting mode. In parameter setting mode, pressing ‘F’ and ‘V/A’
simultaneously will exit the system parameter setting mode and return to the metering
data mode.

In the setting mode:

• ‘V/A’ can be used to confirm changes or go to the next screen

• ‘F’ can be used to change a setting or enter edit mode. A digit

When in edit mode:

• Press ‘F’ to increase the number of the flashing digit

• Press ‘V/A’ to switch the flashing digit

• Press ‘V/A’ on the last digit to confirm the change; the cursor should stop flashing.

Once you are in the settings mode, you will be required to type in a password on the
‘PASS’ screen.

• Enter your password or leave it as default ‘0000’ if it wasn’t changed.

• Press ‘V/A’ to enter the system parameter settings mode.

3.2.2 Configure AcuDC to work with Shunt

If the meter is wired to use a shunt to measure the current, you need to configure the full
range current setting and shunt output range in the AcuDC so that it can read accurately
from the shunt.

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Chapter 3: Installation - Con󳆂guration Parameter Set-up

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering display mode to get to the
system parameter setting mode. In the parameter setting mode, Press ‘V/A’ until you get
to the ‘I In’ screen. Enter the rated current input of the shunt in this screen.

SET

Press ‘F’ to change this setting. A digit will begin to flash and you
will enter the edit mode. Press ‘F’ to increase the value of the
flashing digit and press ‘V/A’ to switch the flashing digit. Press
‘V/A’ when on the last digit to confirm the change; the cursor will

Fig 3-2 Full range

current setting

NOTE: The setting can be configured in the range of 20-50000A.

NOTE: Only indirect current wiring has this screen.

stop flashing at this point

SET

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering display
mode to get to the system parameter setting mode. In the
parameter setting mode, press ‘V/A’ until the screen ‘I o’ displays.
This setting corresponds to the output range of the shunt. Press
‘F’ to change this setting. The first digit will begin to flash. Press

Fig 3-3 Full range

shunt setting

‘F’ to increase the value of the flashing digit. Use ‘V/A’ to switch
the flashing digit. Press ‘V/A’ to confirm the change on the last
flashing digit to go to the next screen.

NOTE: The setting can be configured in the range of 50-100mV.

3.2.3 Configure AcuDC to work with Current Hall Effect Sensor

If the meter is wired to measure current using a Hall Effect sensor, you will have to
configure the full range current setting and Current Hall Effect sensor output range in the
AcuDC, so that it can read accurately from the Hall Effect Sensor. To change the settings
from the meter’s display, first get to the parameter setting mode.

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AcuDC 240 Series

DC Energy & Power meters

SET

Refer to section 3.2.2 configure AcuDC to work with Hall Effect
Sensor, first set the full range current setting as shown in Fig
3-2. Press ‘F’ and ‘V/A’ simultaneously whiles in the metering
display mode to get to the system parameter setting mode. In
the parameter setting mode, Press ‘V/A’ until you get to the ‘I In’

Fig 3-4 Current Hall

Effect sensor setting

screen as shown in Fig 3-2. Enter the rated current input of the
shunt in this screen. After setting up the current range, press
‘V/A’ until the screen ‘I P’ displays. This setting corresponds to the
output range of the Hall Effect Sensor. Press ‘F’ to change this
setting and to select required output. Press ‘V/A’ to confirm this
setting; the cursor will stop flashing at this point.

NOTE: The default setting is ‘0’ for 4~20mA/0~±5V. The other mode is ‘1’ for
4-12~20mA/0~±4V.

3.2.4 Configure AcuDC to work with Current and Voltage Hall Effect Sensor

If the meter is wired to measure current and voltage using a current hall effect sensor and
voltage hall effect sensor respectively, You need to configure the settings in the AcuDC so
that it can read accurately from both Hall Effect Sensors.

Refer to section 3.2.2 configure AcuDC to work with shunt, first set up the current input
range as shown in Fig 3-2 full range current setting.

SET

After setting up the current range, press ‘V/A’ to go to the next
screen, as shown in Fig 3-5. This will be the ‘I P’ screen. This
setting corresponds to the output range of the current Hall
Effect Sensor. Press ‘F’ to change this setting and to select
required output. Press ‘V/A’ to confirm this setting; the cursor will

Fig 3-5 Current Hall

stop flashing at this point.

Effect sensor setting

NOTE: The default setting is ‘0’ for 4~20mA/0~±5V. The other mode is ‘1’ for
4-12~20mA/0~±4V.

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Chapter 3: Installation - Con󳆂guration Parameter Set-up

SET

Fig3-6 Range

Voltage setting

After setting up the output range of the Current Hall Effect
Sensor, as shown in Fig 3-5, press ‘V/A’ to go to the next screen.
This will be the ‘U In’ screen, as shown in Fig 3-6. Enter the
rated voltage of the Voltage Hall Effect Sensor. Press ‘F’ to
change this setting. A digit will begin to flash and you will
enter edit mode. Press ‘F’ to increase the value of the flashing
digit. Press ‘V/A’ to switch the flashing digit. Press ‘V/A’ when
on the last digit to confirm the change; the cursor will stop
flashing at this point.

SET

After setting up the rated voltage of the voltage Hall Effect
Sensor, as shown in Fig 3-6, press ‘V/A’ to go to the next screen.
This will be the ‘U P’ screen. This setting corresponds to the
output range of the voltage Hall Effect Sensor. Press ‘F’ to
change this setting and to select required output. Press ‘V/A’

Fig 3-7 Voltage Hall

Effect Sensor setting

to confirm this setting; the cursor will stop flashing at this
point.

NOTE: The default setting is ‘0’: 0~±5V. The other mode is ‘1’: for 0~±4V.

3.2.5 Clear Energy, Ah and DI Counter

SET

To clear the readings from the meter display mode, first get
to the Setting mode. Press ‘F’ and ‘V/A’ simultaneously whiles
in the metering display mode to get to the system parameter
setting mode. In parameter setting mode, press ‘V/A’ until
you get to the ‘EdEL’ screen, as shown in Fig 3-8. The screen

Fig 3-8 Clear Energy

displays ‘No’, which means energy not cleared. Press ‘F’ twice
and it will show ‘YES’, which means ‘clear energy’, and the
energy will be cleared to 0. After you choose ‘YES’ or ‘NO’,
press ‘V/A’ to confirm and go to the next screen.

SET

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering
display mode to get to the system parameter setting mode. In
parameter setting mode, press ‘V/A’ until you get to the ‘AdEL’
screen, as shown in Fig 3-9. The screen displays ‘No’, which
means charge not cleared. Press ‘F’ twice and it will show

Fig 3-9 Clear Ah

‘YES’, which means clear charge Ah, and the charge Ah will
be cleared to 0. After you choose ‘YES’ or ‘NO’, press ‘V/A’ to
confirm and go to the next screen.

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AcuDC 240 Series

DC Energy & Power meters

SET

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering
display mode to get to the system parameter setting mode. In
parameter setting mode, press ‘V/A’ until you get to the ‘ddEL’
screen, as shown in Fig 3-10. The screen displays ‘No’, which
means DI counter not cleared’. Press ‘F’ twice and it will show

Fig 3-10 DI Counter

Reset

‘YES’, which means clear Di counter , and DI counter will be
cleared to 0. After you choose ‘YES’ or ‘NO’, press ‘V/A’ to confirm
and go to the next screen.

3.2.6 Set Backlight Brightness

To set the backlight brightness from the meter display mode, first get to the Setting
mode.

SET

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering
display mode to get to the system parameter setting mode.
In the parameter setting mode, press ‘V/A’ until you get to the
‘bL’ screen, as shown in Fig 3-11. There are 5 levels backlight
brightness. ‘1’ is minimum light level and ‘5’ is maximum light

Fig 3-11 Backlight

Brightness Setting

level. Press ‘F’ to select and press ‘V/A’ to confirm and go to the
next screen.

3.2.7 Meter Clock Setting

SET

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering
display mode to get to the system parameter setting mode. In
parameter setting mode, press ‘V/A’ until you get to the ‘dATE’
screen, as shown in Fig 3-12. Press ‘F’ to change this setting. A
digit will begin to flash and you can change the number. Press

Fig 3-12 Date

Adjustment

‘F’ to increase the value of the flashing digit. Press ‘V/A’ to switch
the flashing digit. Press ‘V/A’ when on the last digit to confirm
the change; the cursor will stop flashing at this point. Press ‘V/A’
to confirm and go to the time setting screen.

SET

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering display
mode to get to the system parameter setting mode. In the
parameter setting mode, press ‘V/A’ until you get to the ‘TinE’
screen, as shown in Fig 3-13. The meter uses the 24-hour clock
system. The time shown in Fig 3-15 is 14:19:52. Press ‘F’ to change

Fig 3-13 Time

Adjustment

this setting. A digit will begin to flash and you can change the
number. Press ‘F’ to increase the value of the flashing digit. Press
‘V/A’ to switch the flashing digit. Pressing ‘V/A’ when on the last
digit will confirm the change; the cursor will stop flashing at this
point. Press ‘V/A’ to confirm and go to the next screen.

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Chapter 3: Installation - Con󳆂guration Parameter Set-up

3.2.8 Password Setting

SET

Press ‘F’ and ‘V/A’ simultaneously whiles in the metering
display mode to get to the system parameter setting mode. In
parameter setting mode, press ‘V/A’ until you get to the ‘PASS’
screen, as shown in Fig 3-14. Press ‘F’ to change this setting. A
digit will begin to flash and you can change the number. Press

Fig 3-14 Password

Setting

‘F’ to increase the value of the flashing digit. Press ‘V/A’ to switch
the flashing digit. Press ‘V/A’ when on the last digit to confirm
the change; the cursor will stop flashing at this point. Press ‘V/A’
to confirm and go to the next screen.

By now the parameter settings are almost completed, except for the I/O module setting.
Pressing ‘F’ and ‘V/A’ simultaneously will exit system parameter settings mode and return
to the metering data mode.

3.3 AcuDC Communication Setup

NOTE: Only meters with communication options have device address, baud rate and

parity setting screens.

To set communication parameters from the meter display mode, you must first press
the ‘F’ and ‘V/A’ buttons simultaneously to get to the parameter setting mode. The
communication parameter setup includes address setup, Baud rate setup, and parity
setting, as shown in table 3-3.

SET

Communication address can be any integer 1 ~ 247. Fig 3-15
shows the address number is 1. Press ‘F’ to change this setting.
The first digit will begin to flash and you can change the edit
mode. Press ‘F’ to increase the value of the flashing digit. Press
‘V/A’ to switch the flashing digit. Press ‘V/A’ when on the last

Fig 3-15

Communication

digit to confirm the change; the cursor will stop flashing at this
point. Press ‘V/A’ to confirm and scroll to the next screen.

Address Setup

NOTE: Modbus-RTU communication protocol requires that all meters on the same
communication bus should have different addresses.

SET

After address setup, the second screen is Baud rate setting
page, or in parameter setting mode, press ‘V/A’ until see ‘bPS’
on the screen. Baud rate can be set as 1200, 2400, 4800, 9600,
19200 and 38400. Fig 3-18 shows the baud rate is 19200 bps.
Press ‘F’ to select the desired baud rate, and then press ‘V/A’ to

Fig 3-16 Baud Rate

confirm and go to the next screen.

Setting

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DC Energy & Power meters

SET

Fig 3-17 Parity

Setting

NOTE: All devices on the same communication bus should use the same baud rate and
parity settings.

After Baud rate setup, the next screen is the Parity setting page,
or in parameter setting mode, press the ‘V/A’ button until you see
‘CHEC’ on the screen. Parity can be set as EVEN: even parity, 1 stop
bit; ODD: odd parity, 1 stop bit; 1: no parity, 1 stop bit; 2: no parity, 2
stop bits. Fig 3-17 shows no parity, and 1 stop bit. Press ‘F’ to select
the desired baud rate, and then press ‘V/A’ to confirm and go to
the next screen.

3.4 I/O Parameter Setup

I/O module has two optional types: AO(Analog Output) type and RO(Relay Output) type.

In the system parameter setting operation, hold the ’F” key for 3 seconds to enter the AO
parameter setting mode, or hold the ‘V/A’ key for 3 seconds to enter the RO parameter
setting mode. In the AO or RO setting mode, key functions are the same as in system
parameter settings mode. ‘F’ key is used to increase value by 1 for the flashing digit.
‘V/A’ key is used to confirm the flashing digit and move to the cursor. At the last digit of
the parameter, pressing ‘V/A’ key will confirm and go to the next screen. On ant screen,
pressing ‘F’ and ‘V/A’ simultaneously will exit AO or RO parameter settings mode and
return to the system parameter settings mode.

Note: only the meters have AO or RO functions have the valid operations for the
corresponding AO or RO parameter setting .

3.4.1 Meter Clock Setting

For the module that supports the Analog Output function, it offers two AO channels. The
AO parameter can be voltage, current and power. AO upper and lower limits include ‘sign’
and ‘percentage’ digit. The sign digit has three options”:

represents (±). The range of the percentage digit is ‘0.00~1.00’, representing ‘0%~100%’
of the full range value. When the AO parameter is set as voltage, the upper and lower
limit setting is ‘0%~100%’. When AO parameter is set as current or power, there are four
modes:’ 0%~ +100%’; 0%~ -100%’;’-100%~ +100%’ and ‘0%~ ±100%’.

NOTE:

1. There is no ‘sign’ digit when AO is set as voltage. ‘sign’ digit is invisible when percentage is 0.

2. For limit setting, 1.00 is 100%, 0 is 0%, and 0.25 is 25%.

represents (+), represents (-),

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Chapter 3: Installation - Con󳆂guration Parameter Set-up

SET

In parameter setting mode, hold ‘F’ for 3 seconds until the screen
‘AotP’ displays (as shown in Fig 3-18), the meter is in AO parameter
setting mode. It is the AO output setting. There are four AO
output modes: 0: 0 ~ 5V; 1: 1 ~ 5V; 2: 0 ~ 20mA; 3: 4 ~ 20mA. Press
‘F’ key to select the type number (0, 1, 2 or 3), and then press

Fig 3-18 AO Output

Setting

‘V/A’ key to confirm and scroll to the next screen setting page.
For example, Fig 3-18 shows the output type is 3, it means its AO
output type is 4~20mA mode.

NOTE: AO output type is determined by the equipped I/O module you ordered; incorrect
parameter setting will result in invalid AO output value.

SET

In AO parameter setting mode, press ‘V/A’ until the screen ‘Ao 1P’
displays (as shown in Fig 3-19). It is AO1 parameter setting. There
are three options: 0: voltage; 1: current; 2: power. Press ‘F’ key to
select the parameter number (0, 1, or 2), and then press ‘V/A’ key
to confirm and scroll to the next screen setting page. Fig 3-19

Fig 3-19 AO1

shows the AO1 is se t as current.

Parameter Setting

NOTE: AcuDC 241 and 242 do not have this screen. AO1 is set as what is being measured.

SET

Fig 3-20 AO1 Lower

Limit Setting

SET

Fig 3-21 AO1 Up Limit

Setting

In AO parameter setting mode, press ‘V/A’ until the screen ‘Ao 1L’
displays (as shown in Fig 3-20). It is AO1 lower limit setting, range
is ‘0.00 ~ 1.00’. There is no ‘sign’ digit when the limit is 0. When
the limit is not 0, the ‘sign’ digit will be visible, the sign can be
adjusted by moving the cursor to the digit. Press ‘F’ and ‘V/A’ to
edit the value, and then press ‘V/A’ key to confirm and scroll to the
next screen setting page. Fig 3-20 shows the AO1 lower limit is set
as 0.

In AO parameter setting mode, press ‘V/A’ until the screen ‘Ao 1H’
displays (as shown in Fig 3-21). It is AO1 upper limit setting, range
is ‘-100% ~ +100%’. The entire upper limit’s absolute value cannot
be smaller or equal to the lower limit’. Under no circumstance
can the upper limit be 0. Press ‘F’ to edit the value, and then press
‘V/A’ key to confirm and scroll to the next screen setting page. Fig
3-21 shows the AO1 up limit is set as +100%.

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DC Energy & Power meters

SET

In AO parameter setting mode, press ‘V/A’ until the screen ‘Ao 2P’
displays (as shown in Fig 3-22). It is AO2 parameter setting. There
are three options: 0: voltage; 1: current; 2: power. Press ‘F’ key to
select the parameter number (0, 1, or 2), and then press ‘V/A’ key
to confirm and scroll to the next screen setting page. Fig 3-22

Fig 3-22 AO2

shows the AO2 is set as voltage.

Parameter Setting

NOTE: 241 and 242 do not have this screen. AO1 is set as what is being measured.

SET

In AO parameter setting mode, press ‘V/A’ until the screen ‘Ao 2L’
displays (as shown in Fig 3-23). It is AO1 lower limit setting, range
is ‘0.00 ~ 1.00’. There is no ‘sign’ digit when the limit is 0. When
the limit is not 0, the ‘sign’ digit will be visible, the sign can be
adjusted by moving the cursor to the digit. Press ‘F’ to edit the

Fig 3-23 AO2 Lower

Limit Setting

value, and then press ‘V/A’ key to confirm and scroll to the next
screen setting page. Fig 3-23 shows the AO1 lower limit is set as 0.

SET

In AO parameter setting mode, press ‘V/A’ until the screen ‘Ao
2H’ displays (as shown in Fig 3-22). It is the AO2 upper limit
setting, range is ‘-100% ~ +100%’. The entire upper limit’s absolute
value cannot be smaller or equal to the lower limit’. Under no
circumstance can the upper limit be 0. Press ‘F’ to edit the value,

Fig 3-24 AO2 Up

Limit Setting

and then press ‘V/A’ key to confirm and scroll to the next screen
setting page. Fig 3-24 shows the AO1 up limit is set as +100%.

3.4.2 RO parameter setting

In the system parameter setting operation page after successfully entering the password,
hold the ‘V/A’ key for 3 seconds to enter the RO parameter setting page. The I/O module
that contains the Relay Output function offers two RO channels. There are three
modes for RO: Latch, Momentary and alarm. The mode setting depends on the object
requirement i.e. A circuit breaker use Momentary. The momentary delay time is 300-5000
ms. Due to the relay action time error, this delay time has up to 3ms error.

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SET

Fig 3-25 RO1 Mode

Setting

SET

Fig 3-26 RO1

Momentary Delay

Time

SET

Fig 3-27 RO1 Alarm

Parameter Setting

RO1 mode setting: In the parameter setting mode, hold ‘V/A’ for 3
seconds until the screen ‘Ro1F’ displays (as shown in Fig 3-23), the
meter is in RO parameter setting mode. There are 3 RO1 modes:
0: Latch; 1: Momentary; 2: Alarm. Press ‘F’ key to select the mode
number (0, 1 or 2), and then press ‘V/A’ key to confirm and scroll
to the next screen setting page. For example, Fig 3-25 shows the
RO1 mode is Latch.

RO1 momentary delay time setting: In RO parameter setting
mode, if RO1 mode is set as 1, Momentary, press ‘V/A’ key until the
screen ‘Ro1d’ displays. The delay range in 300 ~ 5000 ms. Press
‘F’ to set the delay time. And then press ‘V/A’ key to confirm and
scroll to the next screen setting page. Fig 3-26 shows the RO1
momentary delay time is 500ms, or 0.5s.

RO1 alarm parameter setting: In RO parameter setting mode, if
RO1 mode is set as 2, Alarm, press ‘V/A’ key until the screen ‘Ro1P’
displays. There are 4 options: 0: no alarm; 1: voltage; 2: current; 3:
power. Press ‘F’ to select setting and press ‘V/A’ key to confirm
and scroll to the next screen setting page. Fig 3-27 shows the RO1
alarm is ‘no alarm’.

SET

RO1 alarm inequality setting: In RO parameter setting mode, if
RO1 mode is set as 2, Alarm, press ‘V/A’ key until the screen ‘Ro1S’
displays. There are 2 options: 0: smaller than; 1: larger than. Press
‘F’ to select and press ‘V/A’ key to confirm and scroll to the next
screen setting page.

Fig 3-28 RO1 Alarm

Inequality Setting

SET

RO1 alarm threshold range setting: In RO parameter setting
mode, if RO1 mode is set as 2, Alarm, press ‘V/A’ key until the
screen ‘Ro1u’ displays. The threshold setting range is the same as
measurement range. Voltage: 0 ~ 3000V; Current: 0 ~ 50000A;
Power: 0- 60000kW. Press ‘F’ to edit the value, and press ‘V/A’ key

Fig 3-29 RO1 Alarm

to confirm and scroll to the next screen setting page.

Threshold Range

Setting

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SET

DC Energy & Power meters

SET

Fig 3-30 RO1 Alarm

Delay Setting

SET

Fig 3-31 RO2 Mode

Setting

SET

Fig 3-32 RO2

Momentary Delay

Time

RO1 alarm delay setting: In RO parameter setting mode, if RO1
mode is set as 2, Alarm, press ‘V/A’ key until the screen ‘Ro1t’
displays. The alarm delay time range is 0 ~ 255 s. In Fig 3-30,
the alarm delay time is 15 seconds. If the alarm condition is
met, after 15 second, the alarm will be triggered; or if the alarm
condition is no longer met, after 15 seconds, the alarm will be
restored. Press ‘F’ to edit the value, and press ‘V/A’ key to confirm
and scroll to the next screen setting page.

RO2 mode setting: In RO parameter setting mode, press ‘V/A’
until the screen ‘Ro2F’ displays (as shown in Fig 3-31). There are
3 RO2 modes: 0: Latch; 1: Momentary; 2: Alarm. Press ‘F’ key to
select the mode number (0, 1 or 2), and then press ‘V/A’ key to
confirm and scroll to the next screen setting page. For example,
Fig 3-29 shows the RO2 mode is Latch.

RO2 momentary: In RO parameter setting mode, if RO1 mode
is set as 1, Momentary, press ‘V/A’ key until the screen ‘Ro2d’
displays. The delay range in 300 ~ 5000 ms. Press ‘F’ to set the
delay time and then press ‘V/A’ key to confirm and scroll to the
next screen setting page. Fig 3-30 shows the R21 momentary
delay time is 500ms, or 0.5s.

SET

RO2 alarm parameter setting : In RO parameter setting mode,
if RO2 mode is set as 2, Alarm, press ‘V/A’ key until the screen
‘Ro2P’ displays. There are 4 options: 0: no alarm; 1: voltage; 2:
current; 3: power. Press ‘F’ to select and press ‘V/A’ key to confirm
and scroll to the next screen setting page. Fig 3-33 shows the

Fig 3-33 RO2 Alarm

RO2 alarm parameter is set as ‘voltage’.

Parameter Setting

RO2 alarm inequality setting: In RO parameter setting mode,
if RO2 mode is set as 2, Alarm, press ‘V/A’ key until the screen
‘Ro2S’ displays. There are 2 options: 0: smaller than; 1: larger than.
Press ‘F’ to select and press ‘V/A’ key to confirm and scroll to the
next screen setting page.

Fig 3-34 RO2 Alarm

Inequality Setting

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SET

RO2 alarm threshold range setting: In RO parameter setting
mode, if RO2 mode is set as 2, Alarm, press ‘V/A’ key until the
screen ‘Ro2u’ displays. The threshold setting range is the same as
measurement range. Voltage: 0 ~ 3000 V; Current: 0 ~ 50000A;
Power: 0~ 60000kW. Press ‘F’ to edit the value and press ‘V/A’ key

Fig 3-35 RO2 Alarm

to confirm and scroll to the next screen setting page.

Threshold Range

Setting

SET

RO2 alarm delay setting: In RO parameter setting mode, if RO2
mode is set as 2, Alarm, press ‘V/A’ key until the screen ‘Ro2t’
displays. The alarm delay time range is 0 ~ 255, unit: second. In
Fig 3-36, the alarm delay time is 15 second. If the alarm condition
is met, after 15 second, alarm will be triggered; or if the alarm

Fig 3-36 RO2 Alarm

Delay Setting

condition is no longer met, after 15 seconds, the alarm will be
restored. Press ‘F’ to edit the value, and press ‘V/A’ key to confirm
and scroll to the next screen setting page.

Table 3-3 I/O Parameter Setting

Label Paramters Options Description

AO (Analogy

Output)

RO

AO Output 0; 1; 2; 3

AO1 Parameter 0; 1; 2 0: voltage; 1: current; 2: power

AO1 lower limit 0.00 ~ 1.00 0%-100%

AO1 up limit -1.00 ~ +1.00

AO2 parameter 0; 1; 2 0: voltage; 1: current; 2: power

AO2 lower limit 0.00 ~ 1.00 0%~100%

AO2 up limit -1.00 ~ +1.00

RO1 mode 0; 1; 2

RO1 momentary delay

time

RO1 alarm parameter 0; 1; 2; 3 0: no alarm; 1: voltage; 2: current; 3: power

300 ~ 5000 Unit: ms

The entire upper limit’s absolute value

should be larger than the lower limit.

The entire upper limit’s absolute value

should be larger than the lower limit.

0: 0 ~ 5V; 1: 1 ~ 5V;

2: 0 ~ 20mA; 3: 4 ~ 20mA

-100%~100%

-100%~100%

0: Latch;

1:Momentary;

2: Alarm

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Label Paramters Options Description

RO

RO1 alarm inequality 0; 1

RO1 alarm threshold

range

RO1 alarm delay 0 ~ 255 unit: second

RO2 mode 0; 1; 2

RO2 momentary delay

time

RO2 alarm parameter 0; 1; 2; 3

RO2 alarm inequality 0; 1

RO2 alarm threshold

range

RO2 alarm delay 0 ~ 255 unit: second

Voltage: 0 ~ 3000 V;
Current: 0 ~ 50000A;
Power: 0~ 60000kW.

300 ~ 5000 Unit: ms

0: no alarm; 1: voltage; 2: current;

Voltage: 0 ~ 1200V;

Current: 0 ~ 50000A;

Power: 0~ 6000kW

0: smaller than;

1: larger than

0: Latch;

1:Momentary;

2: Alarm

3: power

0: smaller than;

1: larger than

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DC Power and Energy Meters

Chapter 4: Viewing Metering Parameters via Display

4.1 General Display on the AcuDC

4.2 View the Meter and Load Running Time

4.3 View the Serial Number from the Meter

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AcuDC 240 Series

CHAPTER 4: VIEWING METERING PARAMETERS – VIA

DISPLAY

You can view different information from the metering screen. For example, you can view voltage,
current, power, energy, electric charge and clock information.

In the metering screen, press ‘F’ to go to next screen, press ‘V/A’ to go to the different windows to
view different information.

4.1 General Display on the AcuDC

AcuDC 240 normally displays the metering screen, which shows real-time measured
data, such as voltage, current, power, energy, meter clock, DI counter etc., as shown in
table 4-1.

DC Energy & Power meters

The first screen on the metering screen shows voltage, current and power. Please note
that AcuDC241 only shows voltage and AcuDC242 only shows current. Only AcuDC243
shows voltage, current and power at the same time.

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Chapter 4: Viewing Metering Parameters via Display

V

Fig 4-1 Voltage

Display (AcuDC 241)

k

Fig 4-2 Current

Display (AcuDC 242)

1

2

3

V
A
kW

Fig 4-3Multifunction
Display (AcuDC 243)

For the AcuDC 241, it only displays voltage, and there is a unit ‘V’
shown at the top right corner. For example, the screen in Fig. 4-1
shows it is AcuDC 241, and the voltage is 220.2V.

For the AcuDC 242, it only displays current, and there is a unit ‘A’
shown at the top right corner. For example, the screen in Fig. 4-2
Shows it is AcuDC 242, and the current is 49.99A.

For the AcuDC 243, the screen displays current, voltage and
power, and the units are ‘V, A and kW’ shown at the top right
corner. The first line displays voltage, the second line displays
current and the third line displays power. For example, the voltage
shown in the left figure is 220.2V; the current shown in the left
figure is 49.99A, the power shown in the left figure is 11.00KW.
Communication status is active.

NOTE: Communication status is displayed on every screen in AcuDC 243.

Press ‘F’ to view the Energy data.

You can press ‘V/A’ on the energy screen to switch between different types of energy.

E1 = Import Energy (consumed energy), E2 = Export Energy (generated energy) , E3 =
Total Energy (absolute sum of import energy and export energy), and E4 = Net Energy
(algebraic sum of import energy and export energy).

kWh

kWh

kWh

(a) Import Energy (b) Export Energy (c) Total Energy (d) Net Energy

Fig 4-4 Energy Display

kWh

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Press ‘F’ to go to the third screen. The third screen shows Electric charge.

You can press ‘V/A’ on the electric charge screen to switch between different types of
charges. Ah1 = Import Charge, Ah2 = Export Charge, Ah3 = Total Charge (absolute sum of
Import Charge Ah and Export Charge Ah), and Ah4 = Net Charge (algebraic sum of Import
Charge Ah and Export Charge Ah).

DC Energy & Power meters

(a) Import Charge (b) Export Charge

Fig 4-5 Charge Display

Press ‘F’ to go to the fourth screen. The fourth screen shows clock information. For
example, screen displayed in Fig 4-6a shows the date is 2014:04:09; screen displayed in
Fig 4-6b shows the time is 14:19:52. You can press ‘V/A’ on the clock information screen to
switch between the date and time.

(a) Date Display

Fig 4-6 Clock Information Display

If the meter is equipped with DI counting function (AcuDC 240 with I/O module), press ‘F’
key to go to the DI count display screen. You can press ‘V/A’ on the DI counting screen to
switch between the DI1 and DI2 counting.

(c) Total Charge

SET

(b) Time Display

(d) Net Charge

(a) DI1 Count Display

Fig 4-7 DI Count Display

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(b) DI2 Count

Display

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Chapter 4: Viewing Metering Parameters via Display

Screen No. Widnow No. Description Operation

Voltage Current Power 1 1

Energy E1 2 1 E1: import energy Press ‘F’ at last screen

E2 2 E2: export energy Press ‘V/A’

E3 3 E3: Total energy Press ‘V/A’

E4 4 E4: net energy Press ‘V/A’

Charge Ah1 3 1 Ah1: import charge Press ‘F’ at last screen

Ah2 2 Ah2: export charge Press ‘V/A’

Ah3 3 Ah3: Total charge Press ‘V/A’

Ah4 4 Ah4: net charge Press ‘V/A’

Meter Clock Date 4 1 Year/month/day Press ‘F’ at last screen

Time 2

DI count number

DI1

Count

DI2

Count

5 1 Press ‘F’ at last screen

2 Press ‘V/A’

241 only displays voltage;

242 only displays current;

243 displays all

Hour/min/sec
24-hour clock

First screen in metering data

display mode

Press ‘V/A’

4.2 View the Meter and Load Running Time

If you press down the ‘F’ button for about 3 seconds while in the metering data mode,
you will get to the meter information display mode. You can press ‘F’ to exit the meter
information display mode.

• In this meter information display mode, you can press ‘V/A’ to switch between the

meter running hours and load running hours. ‘r’ means meter running hours while ‘L’

means load running hours.

(a) Meter Running

Time

(b) Load Running

Time

Fig 4-8 Running Time Display

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4.3 View the serial number from the meter

If you press down the ‘V/A’ button for about 3 seconds while in the metering data mode,
you will get to the serial number display mode. You can press ‘V/A’ to exit the serial
number display mode.

NOTE: This screen displays the last 8 digits of the meter’s serial number.

DC Energy & Power meters

Fig 4-9 Serial Number

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DC Power and Energy Meters

Chapter 5: Viewing Real-Time Readings

via Acuview Software

5.1 Connection Setup

5.1.1 Wiring

5.1.2 Acuview software setup

5.2 Configuration Parameters Setup

5.2.1 General meter parameter setting

5.2.2 Configure the Data Log using the
meter’s memory

5.2.3 Configure the Data Log to log to
computer memory

5.3 Viewing Metering Parameters

5.3.1 Real-time Metering

5.3.2 Reading Data Log on
meter’s onboar memory

5.3.3 Reading Data Log on a
computer’s memory

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CHAPTER 5: Viewing Real-time Readings Via AcuView

Software

This chapter will mainly discuss how to use the meter via the communication port using
software. It is highly recommended that previous chapters be read before moving onto
Chapter 5, a familiarity with Modbus would also be helpful.

5.1 Connection Setup

5.1.1 Wiring

Refer to section 2.3.6(Communications Wiring)

5.1.2 Acuview Software Setup

1. New Connection:

A connection is required before communicating with the meter. To add a new
connection, do one of the following:

1) Click Setting > Connection Manager

DC Energy & Power meters

or

2) Click the icon

The Connection Manager is shown as in Fig 5-1.

Fig 5-1 Connection Manager

• New: add a new connection

• Delete: Delete the select connection

• Edit: Edit the selected connection settings.

• Close: Close the window

• Status: ‘Available’ means Com Port is active, and ‘not Available’ means Com Port is

inactive. If the status is blank, it means that Com Port has not been established.

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2. Connection Settings:

Set the connection parameters. The Connection Settings box is shown on the screen as in
Fig. 5-2 Click ‘OK’ after settings finish.

1) Click Operation > Add Device

or

2) Click the icon

Fig 5-2 Acuview Software Connection Settings

• Name: Give connection a name

• Type: Select the serial port that the RS485 connection is using

• Com Port: Select the serial port that the RS485 connection is using

• Baud Rate: Should match the baud rate in the meter settings.

• Parity: Should match the parity in the meter settings.

• Scan Interval: Used to adjust the time interval between two message(200ms or

500ms is recommended)

NOTE: Baud Rate and Parity must match between meter and software.

NOTE: How to find ‘Com Port’ in your computer

Right click on ‘Computer’, then click ‘Properties’ menu. In the pop up window click on
‘Device Manager’ from the left navigation panel to find the port number. In the device
Manager window, double click on ‘Port (COM&LPT)’ from the dropdown list. Find the ‘USB
Serial Port (COMx)’ the number in brackets is the port number, i.e. COM4. Please select
the corresponding Com Port here.

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3. Add Device:

After performing step 1 and 2 above, you need to add a device to communicate with. To
add a new device, do one of the following:

1) Click Operation >Add Device

or

2) Click the icon

The Add Device box is shown as Fig 5-3. Click ‘OK’ after settings finish.

DC Energy & Power meters

Fig 5-3 Add Device

• Device Type: The model of the device you are going to communicate with

• Connection: Select a connection for the communication

• Device Address: Should match the address in the meter settings

• Description: Device description such as where the device is used, for example,

‘Building 1’.

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Chapter 5: Viewing Real-Time Readings via Acuview Software

4. Connection:

You can read all the measurement data after you successfully complete Step 3. To
connect, do one of the following:

1) Click Operation > Connect

Or

2) Click the icon

Or

3) Press F9 on keyboard

If the connection is successful, the screen will show the measured data on the screen, and
you will see ‘Com Failure = 0, Log Failure = 0’ at the bottom right corner on the screen.

If the connection is not successful, no measured data will appear on the screen, and you
will see ‘Com Failure = 1, Log Failure = 0’ at the bottom right corner on the screen in red.

NOTE: If connection is not successful, please make sure: The physical connection of the
device is correct; the communication parameters, such as Baud Rate, Parity, device type
and device address are not properly set.

5.2 Configuration Parameters Setup

5.2.1 General Meter Parameter Setting

• From the left navigation panel click on the ‘Settings’ tab and then on ‘General’. You

can set up the system parameters and I/O settings from this section, as shown in Fig

5-4.

• Click on ‘Update Device’ after making changes, so that the changes can be saved on

the meter.

Parameters can be setup with following rules:

Security and Communication: You can set the meter’s password, device address, Baud
Rate and parity from this section and the meter will make the corresponding changes.

Voltage and Current: If you are measuring your voltage using a voltage Hall Effect sensor
and/or your current using either a Hall Effect sensor or a shunt, you will have to set the
Voltage and/or Current sections.

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RO1 Output Mode/RO2 Output Mode: This is available with the ‘X3’ module

Choose between the three modes:

• Latch: To manually turn on and off the relay

• Momentary: To turn on the relay for a set number of seconds before it goes back off.

• If momentary mode is selected, set the delay time ‘On Time’; the range is 300-

5000ms. The delay time has an error of up to 3ms (due to the relay action time

error)

• Alarm: To trigger the relay output through an alarm event.

RO Alarm Limit: Set the Alarm Channel, Setting, Setpoint and Delay (in sec) for both RO1
and RO2; this is needed if RO1/RO2 Output mode is set as ‘Alarm’

DC Energy & Power meters

Fig 5-4 General settings

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Raw Channel of AO1/Raw Channel of AO2: The settings are available with the X1 and X2
modules

Select the parameter (Voltage, Current, Power) you will like to send as an Analog Output.

Set the High and Low Limit based on the parameter you have selected.

Note:

• When AO parameter is set as voltage, the upper and lower limit setting range is

between 0% - 100%. E.g. it can be set as: 0% - 100%, 0% - 50% etc.

• When AO parameter is set as current or power, there are four different modes for

the upper and lower limit setting range. It can be between: 0% - +100%, 0% - -100%,

-100% - +100%, and 0% - ±100%. E.g. it can be set as: 0% - +50%, 0% - -50% etc.

• Upper Limit cannot be 0%

Other:

• You can adjust the backlight brightness under the Backlight Adjustment section. The

range is from 1 to 5.

DI 1 Type/ DI 2 Type:

Select DI 1 or DI 2 as:

• State: DI will act as a switch status monitor

• Counter: DI will act as a pulse counter.

NOTE: You can ‘import’ a saved device profile to quickly setup the meter parameters:

Click Tools->Import Device Settings, select the desired file and click ‘Open’, and after
importing successfully, click ‘Update Device’, or click Tools->Import and Update Device,
select the desired file.

You also can save the current settings to a file via the export device profile function in
‘Tools’.

5.2.2 Configure the Data Log using the meter’s onboard memory

You can set up the meter to log data on the onboard memory.

• From the left navigation panel click on the settings tab then click ‘Data Log’ to access

the data log setting page (as shown in Fig 5-5).

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Parameter Selection: Select the parameters you would like to log (from the left
box), click ‘Add’ to add them to the box on the right.

DC Energy & Power meters

Fig 5-5 Data Log readings

Enable Data Log: Make sure you check the box ‘Enabled’ to enable data log.

Time Setting: There are three different Logging Modes.

• Continuous: This will start logging data immediately, after the ‘Update Device’ button

is clicked.

• In this mode, you will have to set the Logging Interval.

• Scheduling: This will start logging data from a set Start Time.

• In this mode, you will have to set the Logging Interval and Start Time.

NOTE: When the memory is full, a memory sector is deleted and the data logging

will continue for the above two modes.

• Interval: This will log data from a start time to an end time.

• In this mode, you will have to set the Logging Interval, as well as the Start Time

and End Time.

NOTE: When the memory is full, the data logging will stop. Make sure to click on
‘Update Device’ after making changes, so that the changes can be saved on the
meter.

NOTE: When you click on ‘Update Device’, the meter’s data log memory will be erased.

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Chapter 5: Viewing Real-Time Readings via Acuview Software

5.2.3 Configure the data log to log the readings on the computer’s memory

This applies to AcuDC 240 series meters with communication option; the meters do not
need to have onboard memory since the data will be logged directly on the computer’s
memory.

You can set up the meter to log data directly on the computer memory. You must always

be connected to the software for this data log method to work.

You can access this data log setting by clicking on the ‘Settings’ option located on the
menu toolbar, and then clicking on ‘Data Log Settings’ or click the icon

Fig 5-6 Accessing Data Log

The Data Log Setting window will open. This is shown in Fig 5-6.

In data log setting, as shown in Fig 5-7, make sure you check the ‘Enabled’ box in the
window.

Under the ‘Logging Items of Selection’ Section: click on the required groups of
parameters you will like to log.

Under the ‘Logging Options’ Section:

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DC Energy & Power meters

Fig 5-7 Data Log settings

In data log setting, as shown in Fig 5-7, make sure you check the ‘Enabled’ box in the
window.

Under the ‘Logging Items of Selection’ Section: click on the required groups of
parameters you will like to log.

Under the ‘Logging Options’ Section:

• Choose the ‘Logging Data Interval’.

• Choose between the options ‘Log data until file is full’ or ‘Specify Log file duration’

• If ‘Specify Log file duration’ is selected: Choose how often you want a new file created.

• Choose the ‘Log file format’ you want the file(s) saved as.

Enter the preferred name for the file in ‘Log file name’.

Choose the ‘Log file folder location’ where the file(s) will be saved.

Once everything is set, click ‘OK’.

Finally, make sure you click the icon
the computer. You can click the icon

on the top of the screen to start data logging on

on the top of the screen to stop data logging.

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WARNING: If ‘Excel’ is chosen as the ‘Log file format’: After you click on the icon to
start data logging, a warning window will pop up. Take note of the warning in order to
prevent your files from being corrupt.

Fig 5-8 Warning

To get help or more information on the Acuview software, please click ‘help’ in the main
menu bar, of click the icon

.

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AcuDC 240 Series

5.3 Viewing Metering Parameters

5.3.1 Real-Time Metering

From the left navigation panel click on the ‘Readings’ tab and then select ‘Real-Time
Metering’ to view the meter’s real time data. You can read voltage, current, energy, charge
etc, as shown in Fig 5-9.

You can modify the value of energy and charge by clicking the underlined figures. And
you can also reset the energy, charge, DI counter and Max and Min by clicking ‘Reset’, the
values will reset to 0.

On this reading window you can also control relay 1 and relay 2.

DC Energy & Power meters

Fig 5-9 Reading Real Time Meter (change another picture, with load, this reading

without load, so voltage is 0)

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5.3.2 Reading Data Log on Meter’s Onboard Memory

From the left navigation panel click on the ‘Readings’ tab and then select ‘Data Log’
to retrieve the meter’s logged readings. The parameter settings for data log in meter’s
onboard memory refer to section 5.2.2 (Configure the Data Log using the meter’s onboard
memory).

On this window you can view the data log, while the maximum record number is 85995.

Fig 5-12 Reading Data Log on Meter’s Onboard Memory

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5.3.3 Reading Data Log on the computer’s memory

Find the data log files from the specified folder location where the file was saved. The
parameter settings for data log on the computer’s memory refer to section 5.2.3. If you

chose the default path, there is a folder named MonData in the Acuview installation
directory where all the data log files are stored. By default, each file name consists of
device description, device type, port(Serial mode), device address and data logging
starting time whose format is YYYYMMDD(Year, Month, Day).

DC Energy & Power meters

After you open a data log file, you will see the following items: ‘Time U (V) I (A) P (kW)’.

The file content is the same whether data is saved as .txt or .csv or .Excel.

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DC Power and Energy Meters

Appendix

A. Troubleshooting

B. Modbus Register Map

B.1 MODBUS-RTU Protocol

B.2 Communication Format

B.3 AcuDC 240 Communication
Address Table

C. Ordering Information

D. Glossary of Definitions

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APPENDIX

This chapter will mainly discuss how to use the meter via the communication port using
software. It is highly recommended that previous chapters be read before moving onto
Chapter 5, a familiarity with Modbus would also be helpful.

A. Troubleshooting

My AcuDC 243 is displaying the correct current but the power (kW) is negative.

Check to see if the AcuDC is installed on the negative terminal of the load.

Why is my AcuDC 243 measuring the wrong current with the Current Hall Effect

Sensor?

A connection is required before communicating with the meter. To add a new
connection, do one of the following:

• The Hall Effect Sensor should be installed on the negative side of the load.

• Ensure that the Hall Effect sensor is being powered. If the sensor was purchased from

Accuenergy then the sensor will need a ±15V dc power supply.

• Ensure that the wiring of the sensor is to the AcuDC is correct.

• Terminal 3 of the sensor should be connected to ‘I+’ of the AcuDC 243.

• Terminal 4 of the sensor should be connected to ‘I-‘of the AcuDC 243.

•• Terminal 4 of the sensor must also be connected to Ground.

•• Check that the settings in the meter are configured to read accurately from that

sensor.

DC Energy & Power meters

•• Press ‘F’ and ‘V/A’ simultaneously whiles on the meter data mode to get to the

settings mode.

•• A password screen will display. Leave the password as default ‘0000’ and press ‘V/A’ to

enter the setting mode; the communication address ‘AddR’ screen will display next.

•• Press ‘V/A’ until you get to the ‘I In’ screen. Enter the rated current input of the Hall

Effect Sensor in this screen.

•• Press ‘F’ to change this setting. A digit will begin to flash and you will enter the edit

mode.

•• Press ‘F’ to increase the value of the flashing digit

•• Press ‘V/A’ to switch the flashing digit

•• Press ‘V/A’ when on the last digit to confirm the change; the cursor will stop

flashing at this point

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SET

•• Press ‘V/A’ to go to the next screen. This will be the ‘I P’ screen. This setting

corresponds to the output range of the Hall Effect Sensor.

•• Press ‘F’ to change this setting and to select required output.

NOTE: The default setting is ‘0’ for 4-20mA/0-±5V. The other mode is ‘1’ for
4-12-20mA/0-±4V.

•• Press ‘V/A’ to confirm this setting; the cursor will stop flashing at this point

SET

Appendix

Why is my AcuDC 243 measuring the wrong current with the shunt I am using?

• The shunt should be installed on the negative side of the load.

• Ensure that the AcuDC 243 is wired correctly to the shunt so that it can be read

accurately.

• The positive output from the shunt should be connected to the AcuDC 243 ‘I+’

terminal.

• The negative output from the shunt should be connected to the ‘AcuDC 243

‘I-‘terminal.

• If the voltage is also being measured ensure that the positive DC source is

connected to the AcuDC 243 ‘V+’ terminal whiles the AcuDC 243 ‘V-‘ terminal should

be connected to the ‘I-‘ terminal on the AcuDC 243.

• Ensure that the shunt being used outputs a signal in the range of 50-100mV to work

with the meters current input.

• Check that the settings in the meter are configured to read accurately from the shunt.

• Press ‘F’ and ‘V/A’ simultaneously whiles on the meter data mode to get to the

settings mode.

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• A password screen will display. Leave the password as default ‘0000’ and press ‘V/A’ to

enter the setting mode; the communication address ‘AddR’ screen will display next.

• Press ‘V/A’ until you get to the ‘I In’ screen. Enter the rated current input of the shunt

in this screen.

• Press ‘F’ to change this setting. A digit will begin to flash and you will enter the edit

mode.

• Press ‘F’ to increase the value of the flashing digit

• Press ‘V/A’ to switch the flashing digit

• Press ‘V/A’ when on the last digit to confirm the change; the cursor will stop

flashing at this point.

DC Energy & Power meters

SET

• Press ‘V/A’ to go to the next screen. This will be the ‘I o’ screen. This setting

corresponds to the output range of the shunt.

• Press ‘F’ to change this setting. The first digit will begin to flash and you will enter

the edit mode.

• Press ‘F’ to increase the value of the flashing digit

• Press ‘V/A’ to switch the flashing digit

• Press ‘V/A’ when on the last digit to confirm the change; the cursor will stop

flashing at this point

SET

Why won’t my meter connect to the AcuView software?

• The physical connection of the device is incorrect, please refer to section 2.3.6;

• The communication parameters, such as Baud Rate, Parity, device type, device

address are not properly selected the same as the meter.

• The “Com Port” in the software is not selected as the same as the computer. Please

refer to section 5.1.2.

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B. Modbus Register Map

This chapter will discuss how to operate the meter via the communication port using
software. Before starting this chapter, you should be familiar with Modbus and read
other chapters of this manual to make sure that you have a good understanding of the
functions and applications of this product.

This chapter includes: Modbus protocol, communication format and communication
address table.

B.1 MODBUS-RTU Protocol

Modbus RTU protocol is used for AcuDC 240’s communication. Data format and error
check methods are defined in Modbus protocol. The half duplex query and respond
mode is adopted in Modbus protocol.

Modbus allows master device (PC, PLC etc.) to communicate with slave devices, it will not
allow data exchange between slave devices. Therefore, terminal devices will not engage
the communication link at initialization, only response to the master’s request.

Appendix

B.1.1 Transmission Mode

The mode of transmission defines the data structure within a frame and the rules used to
transmit data.

• Coding System 8 bit

• Start Bit 1 bit

• Data Bits 8bits

• Parity Even/ Odd/ None2/ None1

• Stop Bit 1/2bit

• Error Checking CRC

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B.1.2 Modbus Protocol

1. Frame

When data frame reaches the terminal unit, the unit removes the data frame’s header,
reads the data, if there is no error, it’ll implement the data’s task. Afterwards, the unit
puts its own data with the acquired header, and sends back the frame to the sender. The
response data frame contains: Address, Data and CRC Check. Any error will cause a failure
to respond.

Address Function Data Check

2. Address Field

The address field is at the start of the frame. It is composed of 1 byte (8 bits), its decimal
value range is 0~255.

DC Energy & Power meters

Table B-1 Data Frame Format

8-Bits 8-Bits N X 8-Bits 16-Bits

A master addresses a slave by placing the slave address in the address field of the
message. When the slave sends its response, it places its own address in this address field
of the response to let the master know which slave is responding.

3. Function Field

When a message is sent from a master to a slave device, the function code field tells the
slave what kind of action to perform.

Table B-2 Function Code

Code Meaning Action

01 Read RO Status Obtain Relay Output Current Status (ON/OFF)

02 Read DI status Obtain Digital Input Current Status(ON/OFF)

03 Read holding register

05 Control RO Control Relay Output(ON/OFF))

Obtain Current Binary Value of One or Multiple

Registers

16 Preset multiple registers Place Specific Binary Value into Multiple Registers

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4. Data Field

Data field contains the data that terminals need to complete the request and the data
that terminals respond to the request. This Data may be a numerical value, address or
setting. For example, Function Code tells the terminal to read one register, Data Field
needs to specify from which register and how many registers to read.

5. Error Check Field

The field allows the error check by master and slave devices. Due to electrical noise and
other interfaces, a group of data may be changed while transmitting from one location
to the other. Error Check ensures master or slave devices do not respond to the distorted
data during the transmission, which enhance the system security and efficiency. Error
Check uses 16-bit Cyclic Redundancy Check (CRC 16).

6. CRC Check

Every message includes an error checking field which is based on the Cyclical
Redundancy Check(CRC) method. The CRC field checks the contents of the entire
message. It is applied regardless of any parity check method used for the individual
characters of the message. The CRC field is two bytes long, containing a 16-bit binary
value. The CRC value is calculated by the transmitting device, and is appended to the
message.

Appendix

The receiving device recalculates the CRC value during reception of the message, and
compares the calculated value to the actual value it received in the CRC field.

An error will be reported if the two values are not equal. CRC calculation is first started by
preloading the whole 16-bit register to 1’s. The process begins by applying successive 8-bit
bytes of the message to the current contents of the register. Only the eight bits of data in
each character are used for generating the CRC. Start and stop bits, and the parity bit, do
not apply to the CRC.

When generating the CRC, each 8-bit character is exclusive ORed with the register
contents. The result is shifted towards the least significant bit (LSB), with a zero filled into
the most significant bit (MSB) position. The LSB is extracted and examined, if the LSB
equals to 1, the register is exclusive ORed with a preset, fixed value; if the LSB equals to 0,
no action will be taken. This process is repeated until eight shifts have been performed.
After the last (eighth) shift, the next 8-bit byte is exclusive ORed with the register’s current
value, and the process repeats for eight more shifts as described above. The final contents
of the register, after all the bytes of the message have been applied, the final contents of
the register, which should exchange the high-byte and low-byte, is the CRC value. When
the CRC is appended to the message, the low-order byte is appended first, followed by
the high-order byte.

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B.2 Communication Format

This section will illustrate the format indicated in Table B-3.

DC Energy & Power meters

Table B-3 Protocol Illustration (Hex value and Decimal value)

Addr Fun

06

Hex

Dec 6 3 0 0 0 33 132 101

H

03H 00H 00H 00H 21H 84H 65H

Data Start

Reg Hi

Data Start

Reg Lo

Data # of

Regs Hi

Data # of

Regs Lo

CRC16 Hi CRC 16 Lo

Addr: Slave device address

Data start reg hi: Start register address, high byte

Data start reg lo: Start register address, low byte

Data# of reg hi: Number of registers, high byte

Data# of reg lo: Number of registers, low byte

CRC 16 hi: CRC high byte

CRC 16 lo: CRC low byte

B.2.1 Read Relay Output Status (Function Code 01)

Query

The master device sends query frame to the slave device. Function Code 01 allows users
to acquire the relay output status (1=ON, 0=OFF) of the slave device with the specified
address. Along with slave device address and function code, query frame must contain
the relay register starting address and the number of registers to be read.

AcuDC 240 relay output address starts from 0000H (Relay 1=0000H, Relay 2=0001H).

Table B.4 depicts reading Relay 1 and 2 statuses from slave address 17.

Table B-4 Query Frame of Reading Relay Output Status

Addr Fun

Hex 11H 01H 00H 00H 00H 02H BFH 5BH

Dec 17 1 0 0 0 2 191 91

66

Data Start

Reg Hi

Data Start

Reg Lo

Data # of

Regs Hi

Data # of

Regs Lo

CRC16 Hi CRC 16 Lo

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Response

The slave device answers the master device’s query. The response frame contains slave
device address, function code, data quantity and CRC check. Each relay utilizes one bit
(1=ON, 0=OFF). Table B-5 depicts the response frame.

Table B-5 Response Frame of Reading Relay Output Status

Addr Fun Byte Count Data CRC16 Hi CRC 16 Lo

Hex 11H 01H 01H 02H D4H 89H

Dec 17 1 1 2 212 137

Data Bytes

7 6 5 4 3 2 1 0

Appendix

0 0 0 0 0 0 1 0

(Relay 1=OFF, Relay 2=ON)

B.2.2 Read DI Status (Function Code 02)

Query

This function allows the user to obtain DI status ON/OFF (1=ON, 0=OFF). On top of slave
device address and function code, query frame must contain the digital input register,
starting address and the number of registers to be read. AcuDC 240 DI address starts
from 0000H (DI1-0000H, DI2-0001H).

Table B.6 depicts reading DI1 to DI2 status of the slave device with the address of 17.

Table B-6 Query Frame of Reading DI Status

Addr Fun

Hex 11H 02H 00H 00H 00H 02H FBH 5BH

Data Start

Reg Hi

Data Start

Reg Lo

Data # of

Regs Hi

Data # of

Regs Lo

CRC16 Hi CRC 16 Lo

Dec 17 2 0 0 0 2 251 91

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Response

The slave device answers the master device’s query. The response frame contains slave
device address, function code, data quantity and CRC check. Each DI utilizes one bit
(1=ON, 0=OFF). Table B-7 depicts the response frame.

B.2.3 Read Data (Function Code 03)

Query

This function allows the master to obtain the measurement results from the meter. Table
B.6 depicts reading slave device (address 1) voltage. The AcuDC 240 voltage address is
0200H-0201H.

DC Energy & Power meters

Table B-7 Response Frame of Reading DI Status

Addr Fun Byte Count Data CRC16 Hi CRC 16 Lo

Hex 11H 02H 01H 01H 64H 88H

Dec 17 2 1 1 251 136

Table B-8 Query Frame of Reading Voltage

Addr Fun

Hex 01H 03H 02H 00H 00H 02H C5H B3H

Dec 1 3 2 0 0 2 197 179

Data Start

Reg Hi

Data Start

Reg Lo

Data # of

Regs Hi

Data # of

Regs Lo

CRC16 Hi CRC 16 Lo

Response

Response frame contains slave device address, function code, data quantity and CRC
check.

Table B-9 depicts the response of V=402851D8H (2.6299953V)

Table B-9 Response Frame of Reading Voltage

Addr Fun Byte Count Data1 Hi Data1 Lo Data2 Hi Data2 Lo CRC16 Hi CRC 16 Lo

Hex 01H 03H 04H 40H 28H 51H D8H 52H 31H

Dec 1 3 4 64 40 81 216 82 49

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B.2.4 Control Relay Output (Function Code 05)

Query

This query frame forces the rely status to ON or OFF. The AcuDC 240 relay output address
starts from 0000H(Relay 1= 0000H, Relay 2= 0001H).

Data FF00H changes the relay status to ON, data 0000H changes the relay status to OFF.
The relay will not be influenced by any other data input.

The following is to query slave device 1 to set relay status as ON.

Table B-10 Query Frame of Control Relay Status

Addr Fun DO Addr Hi DO Addr Lo Value Hi Value Lo CRC16 Hi CRC 16 Lo

Hex 01H 05H 00H 00H FFH 00H 8CH 3AH

Appendix

Dec 1 5 0 0 255 0 140 58

Response

The correct response to this request is to send back the received data after the relay status
is changed.

Table B-11 Response Frame of Control Relay Status

Addr Fun DO Addr Hi DO Addr Lo Value Hi Value Lo CRC16 Hi CRC 16 Lo

Hex 01H 05H 00H 00H FFH 00H 8CH 3AH

Dec 1 5 0 0 255 0 140 58

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B.2.5 Read Data (Function Code 03)

Query

Function Code 16 (10 H Hex) allows the user to modify the contents of multiple registers.
AcuDC 240 system parameters can be written by this function code.

The following example depicts how to preset slave device 1’s AO1 parameter (current),
lower limit sign (+), lower limit value (0%), upper limit sign(+), upper limit value (100%)

DC Energy & Power meters

Table B-12 Query Frame of Preset Multiple Registers

Addr Fun

Data Start

Reg Hi

Data Start

Reg Lo

Data # of

Regs Hi

Data # of

Regs Lo

Byte Count Value 1 Hi Value 1 Lo

Hex 01H 10H 01H 09H 00H 05H 0AH 00H 01H

Dec 1 1 9 0 5 10 0 1

Value 2 Hi

Value

2 Lo

Value 3 Hi

Value

3 Lo

Value 4 Hi

Value

4 Lo

Value 5 Hi

Value

5 Lo

CRC 16 Hi CRC 16 Lo

00H 00H 00H 00H 00H 00 00H 64H C5H 8AH

0 0 0 0 0 0 0 100 197 138

Response

The correct response is to send back the address, function code; data starting address,
data number, CRC check after the value is changed.

Table B-13 Preset Multiple Registers Response

Addr Fun

Data Start

Reg Hi

Hex 01H 10H 01H 09H 00H 05H D1H F4H

Dec 1 16 1 9 0 5 209 244

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Data Start

Reg Lo

Data # of

Regs Hi

Data # of

Regs Lo

CRC 16 Hi CRC 16 Lo

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B.3 AcuDC240 Communication Address Table

Basic Measurement Parameter Address

Use Function Code 03 to read

Table 5-14 Real-Time Measurement Address Table

Address (Hex) Address (dec) Parameter Data Type Property

0200H- 0201H 512- 513 Voltage Float R

0202H- 0203H 514- 515 Current Float R

0204H- 0205H 516- 517 Power Float R

0206H- 0207H 518- 519 AO1 Float R

Appendix

0208H- 0209H 520- 521 AO2 Float R

020AH- 020BH 522- 523

020CH- 020DH 524- 525

DI1 Count

Value

DI2 Count

Value

UINT32 R

UINT32 R

NOTE: The high byte is followed by the low byte.

Running Time

The data space below is for running time; function code: 03 Read.

Table B-15 Running Time Address Table

Address (Hex) Address (dec) Parameter Range Data Type Property

0280H-0281H 640- 641

0282H- 0283H 642- 643

Meter run-

ning time

Load run-

ning time

0 ~

999999999

0 ~

999999999

long R

long R

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Energy

The data space below is for energy;

Function Code: 03 Read; 16 Write

Address (Hex) Address (dec) Parameter Range Data Type Property

0300H- 0301H 768- 769 Import energy 0 ~ 999999999 long R/W

0302H- 0303H 770- 771 Export energy 0 ~ 999999999 long R/W

0304H- 0305H 772- 773 Total energy 0 ~ 999999999 long R/W

DC Energy & Power meters

Table B-16 Energy and Charge (Ah) Address Table

0306H- 0307H 774- 775 Net energy

0308H- 0309H 776- 777 Import Ah 0 ~ 999999999 long R/W

030AH- 030BH 778- 779 Export Ah 0 ~ 999999999 long R/W

030CH- 030DH 780- 781 Total Ah 0 ~ 999999999 long R/W

030EH- 030FH 782- 783 Net Ah

0 ~ ±

999999999

0 ~ ±

999999999

long R/W

long R/W

The relationship between the register value and the real value (Rx is the register value).

Table B-17 The relationship between Register Value and Real Value

Parameter Relationship Unit

Voltage Real=Rx V

Current Real=Rx A

Power Real=Rx kW

Energy Real=Rx/100 kWh

Ah Real=Rx/100 Ah

AO Real=Rx

Running Time Real=Rx/100 Hour

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V or mA(depends on the AO

Type)

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Real-Time Clock Area

(Data obtained only by AcuDC 243 meter equipped with storage function.)

Table B-18 Real Time Clock Address Table

Address (Hex) Address (dec) Parameter Range Data Type Property

0284H 644 Year 2000 ~ 2099 Word R/W

0285H 645 Month 1 ~ 12 Word R/W

0286H 646 Day 1 ~ 31 Word R/W

0287H 647 Hour 0 ~ 59 Word R/W

0288H 648 Minute 0 ~ 59 Word R/W

0289H 649 Second 0 ~ 59 Word R/W

MAX records

(Data obtained only by AcuDC 243 meter equipped with storage function.)

Appendix

Function code: 03H for reading

Table B-19 MAX Records Address Table

Address

(Hex)

0400H-

0401H

0402H

0404H High byte: minute; low byte: second

0405H-

0406H

0407H

0409H High byte: minute; low byte: second

040AH-

040BH

Parameter Range Data Type Property

Voltage MAX Float R

High byte: year; low byte: month

Time of occurrence,

Year, Month, Day, Hour,

Minute, Second

Current MAX Float R

High byte: year; low byte: month

Time of occurrence,

Year, Month, Day, Hour,

Minute, Second

Power MAX Float R

Word R0403H High byte: day; low byte: hour

Word R0408H High byte: day; low byte: hour

040CH

Time of occurrence,

040DH High byte: day; low byte: hour

040EH High byte: minute; low byte: second

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Minute, Second

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High byte: year; low byte: month

Word R

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AcuDC 240 Series

MIN records

(Data obtained only by AcuDC 243 meter equipped with storage function.)

Function code: 03H for reading

DC Energy & Power meters

Table B-20 MIN Records Address Table

Address

(Hex)

0460H-

0461H

0462H 1122

0464H 1124

0465H-0466H 1125-1126 Current MIN Float R

0467H 1127

Address

(dec)

1120-1121 Voltage MIN Float R

Parameter Range Data Type Property

High byte: year; low byte:

Time: Year, Month,
Day, Hour, Minute,

Second

High byte: minute; low byte:

High byte: year; low byte:

Time: Year, Month,
Day, Hour, Minute,

Second

month

Word R0463H 1123 High byte: day; low byte: hour

second

month

Word R0468H 1128 High byte: day; low byte: hour

0469H 1129

046AH-

046BH

046CH 1132

046EH 1134

74

1130-1131 Power MIN Float R

Time: Year, Month,
Day, Hour, Minute,

Second

High byte: minute; low byte:

second

High byte: year; low byte:

month

Word R046DH 1133 High byte: day; low byte: hour

High byte: minute; low byte:

second

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Data Logging Setting

(Data obtained only by AcuDC 243 meter equipped with storage function .)

Function code: 03H for reading, 16H for presetting

Table B-21 Data Logging Setting Address Table

Appendix

Address (Hex) Address (dec) Parameter Range Initial Value Data Type Property

0500H 1280

0501H 1281

0502H 1282 Interval time 1 ~ 1440 (Minute) 5 Word R/W 1

0503H 1283

0504H 1284

0505H 1285

0506H 1286

Enable data

logging

Mode of data

logging

Start time

(year, month)

Start time

(day, hour)

Start time

(minute)

End time

(year, month)

0: Disable

1: Enable

0: mode 1, continuous

mode (start after set

parameters)

1: mode 2, timing start

and stop

2: mode 3, specifies

the start time (hour,

minute)

High Byte: year(00~99)

Low Byte: Month(1-12)

High Byte: day(1~31)

Low Byte: hour (0~23)

High Byte: min-

ute(0~59)

Low Byte: reserve

High Byte: year(00~99)

Low Byte: Month(1-12)

0 Word R/W 1

0 Word R/W 1

Word R/W 1

Word R/W 1

Word R/W 1

(Only

used in

mode 2)

Word R/W 1

Register
Number

0507H 1287

0508H 1288

0509H 1289

050AH 1290

050BH-

0524H

1291-1316

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End time

(day, hour)

End time

(minute)

The specified
start recording
time: hour and

minute

Number of regis-

ters in a log

The contents of

a log (ModBus

Register)

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High Byte: day(1~31)

Low Byte: hour (0~23)

High Byte: min-

ute(0~59)

Low Byte: reserve

High Byte: hour(0~23)

Low Byte: min-

ute(0~59)

Register number: 1~26 0 Word R/W 1

(Only

used in

mode 3)

0 Word R/W 26

Word R/W 1

Word R/W 1

Word R/W 1

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AcuDC 240 Series

The contents of one log

Users can select any parameters they want to log from the 13 parameters. In order to
generate historical logs for the selected parameters, users should program the meter so
that selected parameters from the corresponding Modbus registers can be copied to the
historical log record. That is to say, if you want to log a certain parameters, only need to set
the corresponding Modbus address in the register of data logging. One parameter in the
meter is taking up two Modbus registers. The 13 parameters are voltage, current, power,
import energy, export energy, total energy, net energy, , import Ah, export Ah, total Ah, net
Ah, DI1 count value and DI2 count value.

For example” log the current data, register 0200H and 0201H programmed to be
recorded.

The number of Registers in a log

In a log, a parameter using two registers, if you select all of 13 parameters, there are 26
registers to be used.

DC Energy & Power meters

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Log Statue Block

(Data obtained only by AcuDC 243 meter equipped with storage function make sense.)
Function code: 03H for reading

Table B-22 Log Status Address Table

Appendix

Address (Hex) Address (dec) Parameter Range Data Type Property

0700H-0701H 1792-1793 MAX Records 0~350890 Unit32 R 2

0702H-0703H 1794-1795 Used Records 0~350890 Unit32 R 2

0704H 1796

0705H-0706H 1797-1798

0707H-0708H 1799-1800

0709H

070AH

070BH 1803

070CH

070DH

070EH 1806

070FH 1807 Memory status

1801

1802

1804

1805

MAX records in the

Retrieval window

Newest NO. of

records

Oldest NO. of

records

Newest Record Time

stamp

Oldest Record Time

stamp

High Byte: year(00~99)

Low Byte: Month(1-12)

High Byte: day(1~31)

Low Byte: hour (0~23)

High Byte: minute(0~59)

Low Byte: reserve

High Byte: year(00~99)

Low Byte: Month(1-12)

High Byte: day(1~31)

Low Byte: hour (0~23)

High Byte: minute(0~59)

Low Byte: reserve

High Byte: reserve

Low Byte: FEH, memory is

erasing; other, erased

Word R 1

Unit32 R 2

Unit32 2

Word R 3

Word R 3

Word R 1

Register
Number

1) MAX Record

The MAX number of Record of logs is determined by the maximum capacity and the
memory space occupied by one log.

2) Number of records

Number of records is the number of records that has currently been logged, which should
be less than or equal to MAX number.

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AcuDC 240 Series

3) MAX Records in the Retrieval Window

In the Retrieval Window, the maximum number of records can be read.

4) Newest Serial No. of Records

The serial number of the first record is 1, and then is accumulated by 1 as one more record
is put in. The system will delete the old record when the storage memory is full, but the
serial number will not reset, continue to accumulate by the latest serial number.

5) Oldest Serial No. of Records

After storage memory is full, the system will delete the old data to record new data. The
Oldest Serial No. of records is the serial number of the oldest record under the current
state.

6) Latest Record Timestamp

The recording time of the latest record

7) Oldest Record Timestamp

DC Energy & Power meters

The recording time of the oldest record

8) Memory Status

Check the status of the memory. To check whether it is in erasing.

Log Statue Block

(Data obtained only by AcuDC 243 meter equipped with storage function make sense.)
Function code: 03H for reading, 16H for presetting.

Table B-23 Log Retrieval Address Table

Address

(Hex)

0601H-0602H 1537-1538 Starting Record No.

0603H 1539

0604H-067BH 1540-1659 Window

Address

(dec)

Parameter Range Data Type Property

Records number(High

byte)

Record status(low

byte) read only, write

invalidate

Oldest No. of Records ~ Newest No. of

High byte: 1~ the MAX record number in

Low byte: 0~ the MAX record number in

a window: effective number of records in

FDH: Non-effective ‘Start record No.’ or

invalid ‘record number in a window’;

Window data: time mark(6 Bytes) +

Records +1

the window

the window;

FEH: memory is erasing;

FFH: Non-effective data

[data1~dataN](4N bytes)

Invalid data set to 0

UNIT32 R/W

Word R/W

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1) Starting Record No.

The Starting Record No. is accumulated by the number of records in one window after
reading the records in that window. If the new Starting Record No. is larger than the
Latest Serial No., then the Starting Record No. equals to the Latest Serial No. of Records
plus 1.

For example, the initial Starting Record No. of Records is 34, after reading 8 records in one
window, the Starting Record No. automatically turns into 42.

2) Records number

The number of records that fit within a window, which should not be larger than the
maximum record number in one window

The MAX number of records is 240 divided by the size of bytes of one record.

3) Record status

This parameter shows the status of the read data in current window, and is characterized
by the validity of read data. If display data is invalid, window data should be ignored.
If parameters set up correctly and read data is correct, it will return a valid data record
number, otherwise it will return error. This parameter is read-only.

Appendix

0~maximum records that one window can display: number of valid records in the
window.

FDH: Invalid ‘Starting record No.’ or invalid ‘record number in a window’;

FEH: Memory is erasing

FFH: The window is displaying invalid data

4) Window

Window displays valid record data, read-only.

The contents of each record is: time mark (6 bytes) + [data1 ~ data N] (4N bytes).

Note: the number of records in the window is an integer.

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AcuDC 240 Series

System Parameter Setting Address

The system parameter settings, including communication settings and I/O settings, use
Function Code 03H to read, Function Code 16H to preset.

DC Energy & Power meters

Table B-24 System Parameter Settings

Address

(Hex)

0100H 256 Password 0~9999 0000 Word R/W

0101H 257 Device Address 1~247 1 Word R/W

0102H 258 Baud Rate

0103H 259 Parity Setting

0104H 260

0105H 261

0106H 262

0107H 263

0108H 264

0109H 265 AO1 Parameter

010AH 266

Address

(dec)

Parameter Range Default Data Type Property

Full Range

Current Value

Full Range

Shunt Value

Current Hall

Effect Sensor(V)

Current

Hall Effect

Sensor(mA)

Full Range

Voltage Value

Voltage

Hall Effect

Sensor(mA)

AO1 Lower Limit

Sign

1200; 2400; 4800

9600; 19200; 38400

0: Even; 1: Odd;

2: None 2, and

3: None 1

20~50000A 20 Word R/W

50~100mV 100 Word R/W

0: 0~±5V;

1: 0~±4V

0: 4~20mA;

1: 4~12~20mA

5~9999 1000 Word R/W

0: 0~±5V;

1: 0~±4V

0: voltage;

1: current;

2: power

0: +; 1: -; 2: ± 0 Word R/W

19200 Word R/W

3 Word R/W

1

1 Word R/W

0 Word R/W

010BH 267 AO1 Lower Limit 0 ~ 100(%) 0 Word R/W

010CH 268

010DH 269

010EH 270 AO2 Parameter

010FH 271

0110H 272

0111H 273

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AO1 Upper

Limit Sign

AO1 Upper

Limit

AO2 Lower

Limit Sign

AO2 Lower

Limit

AO2 Upper

Limit Sign

0: +; 1: -; 2: ± 0 Word R/W

0 ~ 100(%) 100 Word R/W

0: voltage;

1: current;

2: power

0: +; 1: -; 2: ± 0 Word R/W

0 ~ 100(%) 0 Word R/W

0: +; 1: -; 2: ± 0 Word R/W

0 Word R/W

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Appendix

Address

(Hex)

0112H 274 AO2 Upper Limit 0 ~ 100(%) 100 Word R/W

0113H 275 RO1 Mode

0114H 276

0115H 277

0116H 278

0117H 279

011AH 282 RO2 Mode

011BH 283

011CH 284

011DH 285

011EH 286

011FH­0120H

0121H 289

Address

(dec)

280-281

287-288

Parameter Range Default Data Type Property

RO1 Momentary

Time Delay

RO1 Alarm Pa-

rameter

RO1 Alarm In-

equality

RO1 Alarm Time

Delay

RO1 Alarm

Threshold

RO2 Momentary

Time Delay

RO2 Alarm Pa-

rameter

RO2 Alarm In-

equality

RO2 Alarm Time

Delay

RO2 Alarm

Threshold

Backlight Bright-

ness Level

0: Latch; 1: Momentary;

2: Alarm

300~5000ms 1000 Word R/W

0: No Alarm; 1: Voltage; 2:

Current; 3: Power

0: Smaller than;

1: Larger than

0~255 S 5 Word R/W

The same as full range

values

0: Latch; 1: Momentary;

2: Alarm

300~5000ms 1000 Word R/W

0: No Alarm; 1: Voltage; 2:

Current; 3: Power

0: Smaller than;

1: Larger than

0~255 S 5 Word R/W

The same as full range

values

1~5 5 Word R/W

2 Word R/W

0 Word R/W

0 Word R/W

Float

2 Word R/W

0 Word R/W

0 Word R/W

Float R/W

0122H 290 Clear Energy 0X0A: Enable Word W

0123H 291

0124H 292

0125H 293 DI Working Mode

0126H 294

0127H 295 Clear Ah 0X0A: Effective Word W

0128H 296

0129H 297

Clear Meter Run-

ning Hour

Clear Load Run-

ning Hour

Clear DI Count

Value

Clear MAX/MIN

Value

Clear Data Log-

ging

0X0A: Enable Word W

0X0A: Enable Word W

according to Bit value:

0: Level mode;

1: Count mode;

Bit0: DI1 working mode;

Bit1: DI2 working mode

according to Bit value:

0: Not clear;

1: Clear

Bit0: Clear DI1

Bit1: Clear DI2

0X0A: Effective Word W

0X0A: Effective Word W

3 Word R/W

Word W

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AcuDC 240 Series

DI Status

Use Function Code 02 to read DI status.

Address (Hex) Address (dec) Parameter Range Data Type Property

0000H 0 DI1 1=ON; 0= OFF Bit R

0001H 1 DI2 1=ON; 0= OFF Bit R

Relay Status

Use Function Code 01 to read Relay Status, Function Code 05 to control.

Address (Hex) Address (dec) Parameter Range Data Type Property

DC Energy & Power meters

Table B-25 DI Address Table

Table B-26 Relay Status Table

0000H 0 DO1 1=ON; 0= OFF Bit R/W

0001H 1 DO2 1=ON; 0= OFF Bit R/W

NOTE:

1. Data Type: ‘Bit’ is 1-bit binary; ‘Word’ is 16-bit unsigned integer; ‘Integer’ is 16-bit signed
integer; ‘Float’ is 32-bit floating point.Table B-26 Relay Status Table

2. Read/Write: ‘R’ is read only, reading DI is Function Code 02H; reading DO is Function
Code 01H; reading the other parameter is 03H; ‘R/W’ is read/write, write(control) relay by
Function Code 05H; Use Function Code 10H to write system parameters. Writing into non­writable address is forbidden.

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C. Ordering Information

AcuDC 240

Appendix

Power Supply Option

Current Option

Voltage Option

Datalogging

Communication

I/O Option

P1: 100-240Vac 50/60Hz, 100-300Vdc

P2: 20-60Vdc

A0: 0~±10A

A1: Shunt (50~100mV)

A2: Current Hall Effect Sensor (4~20mA/12mA±8mA)

A3: Voltage Hall Effect Sensor (0~±5V/0~±4V)

1000V: Nominal Input Voltage 1000Vdc

600V: Nominal Input Voltage 600Vdc

300V: Nominal Input Voltage 630Vdc

60V: Nominal Input Voltage 60Vdc

5V: Nominal Input Voltage (0-5V/0-4V), ratio settable

NC: No Communication

C: RS485, Modbus RTU

X0: No I/O

X1: 2DI+2AO (4~20mA/0~20mA)

X2: 2DI+2AO (0~5V/1~5V)

X3: 2DI+2RO

X4: 2DI+2DO

X5: 2DI+ ±15Vdc

ND: No Datalogging

D: Datalogging (Acudc 243 Only)

Model

AcuDC 241: Voltage Meter

AcuDC 242: Current Meter

AcuDC 243: Multifunction

Example: AcuDC 243 - 300 - A2 - P1 - X1 - C - D

NOTE: When the input voltage is above 1000V, or the system design requires an isolation
sensor, the voltage input can be selected as Via Hall Effect Sensor (0~5 V). The Voltage Hall
Effect Sensor output range requires 0~5 V.

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AcuDC 240 Series

D. Glossary of Definitions

AWG: American Wire Gauge, is an U.S. standard of wire conductor sizes. The ‘gauge’ is
related to the diameter of the wire. Larger ‘gauge’ means smaller diameter and thinner
wire.

AO (Analog Output): is a measurable electrical signal with a defined range that is
generated by a controller and sent to a controlled device. The AcuDC 240 series power
meter can output analog voltage or analog current. When it outputs analog voltage, the
range of voltage is from 0 to 5V or from 1 to 5V. When it outputs analog current, the range
of current is from 0 to 20mA or from 4 to 20mA.

Baud Rate: Baud rate is the data transmission rate. In the AcuDC 240 series power meter,
the Baud Rate is used to define the communication rate of RS485, which can be set as
1200, 2400, 4800, 9600, 19200 or 38400.

Charge: the flow of electric charge is called electric current. In the AcuDC 240 series
power meter, the unit of charge is Ah (ampere hour), which equals to the charge
transferred by a steady current of oneampereflowing for one hour

DC Energy & Power meters

Import Charge: Charge that flows to the load from the grid or source

Export Charge: Charge that flows to the grid or source from the load

Total Charge: absolute sum of import charge and export charge

Net Charge: algebraic sum of import charge and export charge

DC: Direct Current is the electrical current which flows consistently in one direction.

DI counter: Digital Input counter for interfacing with devices that output pulses such as a

gas meter.

EMC filter: is a passive electronic device (comprised of multiple components) for
suppressing conducted interference found on any signal or power line to improve the
immunity from EMI (Electromagnetic Interference) signals in the surrounding setting.

Energy: is the integration of power over a defined time increment, measured in unit
of kWh (kilowatt hours). A kWh represents a constant load of 1000 watts for one hour.
Almost all electric bills are based on energy, so energy is a very important measurement
parameter.

Import Energy: energy that is consumed by the load from the grid or source.

Export Energy: energy that is absorbed by the grid or source from the load.

Total Energy: absolute sum of import energy and export energy

Net Energy: algebraic sum of import energy and export energy

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Hall Effect Sensor: is atransducer that is used to measure current and voltage.

I/O (Input/Output) Module: is interface card where data is transferred to accomplish a

function.

Parity: refers to a technique of checking whetherdatahas been lost or written over when
it is moved from one place in storage to another or when transmitted. Usually parity has
odd parity, even parity or no parity. ‘No parity’ means it will not transmit or check a parity
bit.

Power: is the rate at whichelectric energyis transferred by anelectric circuit. Power is an
instantaneous reading. Power = Voltage X Current, measured in unit of watts.

RO(Relay Output): A relay is an electrical switch that opens and closes under control of
another electrical circuit. Existence of relays as outputs makes it easier to connect with
external devices.

Shunt: is a device which allowselectric currentto pass around another point in
thecircuitby creating a low resistance path.

Appendix

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