Accuenergy ACU-DC211, ACU-DC212, ACU-DC213 User manual

AcuDC 200 Series Power Meter

User’s Manual

Your Power and Automation Partner

This manual may not be altered or reproduced in whole or in part by any means without the expressed written consent of Accuenergy.

The information contained in this document is believed to be accurate at the time of publication, however, Accuenergy assumes no responsibility for any errors which may appear here and reserves the right to make changes without notice. Please ask the local representative for latest product specications before ordering.

[Document #1501E2122 Revision Date: Jul., 2012]

AcuDC 200 Series

Please read this manual carefully before doing installation, operation and maintenance of AcuDC 200 series DC meter.

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

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

DANGEROUS

Potential Danger Symbol: Carries information about nearby hazards. Safety operation procedures must be followed to avoid personal injuries.

Alarm Symbol: Carries information about user operation procedures which if not follow may cause malfunction of the meter and may result in injury.

Installation and maintenance of the AcuDC 200 series DC meter should only be performed by qualied, competent personnel who receive appropriate training and should have experience with high voltage and current devices.

Accuenergy shall not be responsible or liable for any damages cause by improper meter installation and or operation.

AcuDC 200 Series

III

AcuDC 200 Series

Content

Chapter 1 Introduction……………………………………………………………………………1

1.1 AcuDC 200 Overview………………………………………………………………………2

1.2 Application Area……………………………………………………………………………3

1.3 AcuDC 200 Series……………………………………………………………………………4

Chapter 2 Installation………………………………………………………………………………5

2.1 Appearance and Dimensions………………………………………………………………6

2.2 Installation Method…………………………………………………………………………8

2.3 AcuDC 200 Wiring Diagram………………………………………………………………14

2.3.1 Auxiliary Power Requirement………………………………………………………15

2.3.2 Voltage and Current Input…………………………………………………………17

2.3.3 I/O Setting……………………………………………………………………………22

2.3.4 Communication……………………………………………………………………28

Chapter 3 Basic Operation and Setup……………………………………………………………33

3.1 Display Panel and Keys……………………………………………………………………34

3.2 Real-Time Metering Mode ………………………………………………………………36

3.3 Parameter Setting Mode…………………………………………………………………37

Chapter 4 Communication……………………………………………………………………47

4.1 Modbus Protocol Introduction……………………………………………………………48

4.2 Communication Format…………………………………………………………………52

4.3 AcuDC 200 Address Table………………………………………………………………… 60

Appendix…………………………………………………………………………………………65

Appendix A Technical Data and Specication………………………………………………66 Appendix B Ordering Information……………………………………………………………70 Appendix C Hall Eect Sensor Specications…………………………………………………72 Appendix D Revision Information……………………………………………………………76

AcuDC 200 Series

Starting!

Congratulations!

You have purchased an advanced, versatile, multifunction power meter. This meter can work as a remote terminal unit (RTU) that contributes to your system's stability and reliability by providing real-time power quality monitoring and analysis.

When you open the package, you will nd the following items.

1. AcuDC 200 series meter 1

2. Removable 14 pin terminal 1

3. Installation clips 2

4. User’s manual 1

5. Maintenance guarantee card 1

Please read this manual carefully before operating or installing the AcuDC 200 meter to avoid unnecessary trouble. You can read part of this manual depends on how you use the AcuDC 200 meter.

Chapter 1 Basic function, specication and application area of AcuDC 200 meter.

Chapter 2 Installation and wiring details of AcuDC 200 meter. Chapter 3 Real-time metering data display and parameter setting method of AcuDC 200 meter.

Chapter 4 Communication protocol format and address table of AcuDC 200.

Appendix Technical data and specications of AcuDC 200 and ordering information.

AcuDC 200 Series

VII

AcuDC 200 Series

VIII

Chapter 1 Introduction

1.1 AcuDC 200 Overview

1.2 Application Area

1.3 AcuDC 200 Series

AcuDC 200 Series

1.1 AcuDC 200 Overview

Powerful Multifunction Power Meter

AcuDC 200 Series multifunction intelligent power meter can measure DC voltage and current with high accuracy. Analog output can be used in DCS system or industry control system. Large character LCD display with backlight provides clear real-time monitoring data readout. This DC meter is designed to meet the requirement for DC power measurement and monitoring.

Small Size and Easy Installation

With the size of DIN96 ×48 and 71mm depth after mounting, the AcuDC 200 meter can be installed in a small gear. Fixing clips are used for easy installation and removal.

Ease of Use

AcuDC 200 utilizes a large character LCD display for clear electrical parameters readout. All setting parameters are accessible by using front panel keys or

communication port (if equipped). Setting parameters are protected in EEPROM, which will maintain its content after the meter is powered o. With the backlight of the LCD, the display can be easily read under dim environment. The backlight "ON" time duration is programmable.

High safety, high reliability

AcuDC 200 meter was designed according to industry standards. The meter receives IEC and UL emission and immunity compliances and is able to operate reliably under high power disturbance condition.

1.2 Application Area

Solar and Wind Energy Systems

Industry Control Systems

DC Energy Management Systems

Large UPS Systems

AcuDC 200 Series

1.3 AcuDC 200 Series

This manual is based on AcuDC 223. Other models may not contain certain functions, please refer to the following table for details:

AcuDC

Function Parameter

Measuring

I/O options

Alarm

Communication RS485 MODBUS

LCD display

●

function

☉

option Blank NA

Voltage (V) Current ( I )

Power (P) Energy(E)

4~20mA

/0~5V

221

222

● ● ● ●

☉ ☉ ☉

☉ ☉ ☉ ☉ ☉ ☉

☉ ☉ ☉

● ● ● ● ● ●

AcuDC

223

211

● ●

AcuDC

212

AcuDC

213

Chapter 2 Installation

2.1 Appearance and Dimensions

2.2 Installation method

2.3 AcuDC 200 Wiring Diagram

2.3.1 Auxiliary Power Requirement

2.3.2 Voltage and Current Input

2.3.3 I/O Setting

2.3.4 Communication

AcuDC 200 Series

Accuenergy

V/A

①

②

③

④

⑤

⑥

⑦

⑧

2.1 Appearance and Dimensions

The installation method is introduced in this chapter. Please read this chapter carefully before installation work.

Appearance









Figure2.1 Appearance of AcuDC 200 meter









Table2.1 Part name of AcuDC 200 meter

AcuDC 200 Series

Part Name Description

1. Enclosure

2. Front Casing

The AcuDC 200 meter enclosure is made of high strength anticombustion engineering plastic

Visible portion (for display and control) after mounting onto a panel

3. LCD Display Large bright blue backlight LCD display

4. Key

Four keys are used to select display and to set parameters of the meter

5. Key Cover Close the cover to avoid wrong key operation

6. Installation Clip Use for locating the meter to the panel

7. Input Terminals Auxiliary power, voltage and current input

8. Extend Wiring Terminals Communication: DI,RO,AO

AcuDC 200 Series

96.00

48.00

60.00

71.00

48.00

Dimension (mm/inch)

( 1.89'')

2.2 Installation Method

Environment

Before installation, please make sure that the environment meets the following conditions.

( 1.89'')

(3.78'')

Figure 2.2 Dimension of AcuDC 200

(2.36'')

(2.80'')

1. Temperature

AcuDC 200 meter’s working temperature range is from -25⁰C to 70⁰C. Operating the meter beyond this range may result in abnormal performance or damaging meter permanently.

AcuDC 200 meter’s storage range is from -40⁰C to 85⁰C.

2. Humidity

AcuDC 200 meter’s working humidity range is from 0 to 95% non-condensing.

3. Position

AcuDC 200 meter should be installed in a dry and dust free environment. Avoid exposing meter to excessive heat, radiation and high electrical noise source.

AcuDC 200 Series

Installation Steps

AcuDC 200 Series meter is typically installed on the panel of switch gear.

1. Cut a rectangular hole on the panel of the switch gear.

The cutting size is as g 2.3, Unit: mm (inch).

cut

0.5

+0.5

-0.0

panel

Fig 2.3 Panel Cutting

0.0

0.5

-0.0

+0.5

0.5

2. Remove installation clips from the meter and insert the meter into the rectangular

hole from the front side.

Panel

Fig 2.4 Put the meter into the rectangular hole

3. Install clips back to the meter from the backside and push the clip tightly so that the meter is xed on the panel.

AcuDC 200 Series

Fig 2.5 Use the clips to x the meter on the panel

Space required for Installation

There should be enough spacing for users to run wires to the meter, install and remove wiring terminal connectors, and operate the meter without interfering or damaging nearby equipment.

Recommended minimum space around the meter is shown in Table2.2 and Fig 2.6.

Side

Fig 2.6 Space around the meter

Table 2.2 Minimum Space

Minimum distance(mm)

temperature

a b c d e f

<50⁰C 25 25 38 64 25 25 ≥50⁰C 38 38 51 76 38 38

AcuDC 200 Series

2.3 AcuDC 200 Wiring Diagram

There are two terminal strips at the back of AcuDC 200.

Top diagram: I/O ports and Communication terminals.

DIGITAL INPUTS AO RELAY OUTPUTS RS-485

DI1+ DI2+ DI3+ DI4+ DIC AO+ AO- R11 R12 R21 R22 A B S

9 10 11 12 13 14 15 16 17 18 19 20 21 22

Bottom diagram: Power, Voltage Input and Current Input ports.

POWER

L N G NC V+ V- I+ I1 2 3 4 5 6 7 8

Note: NC means no connection

VOLTAGE

INPUT

Fig 2.7 Wiring terminals

CURRENT

INPUT

Safety Earth Connection

Before setting up the meter's wiring, please make sure that the switch gear has an earth ground terminal. Connect both the meter's and the switch gear's ground terminal together. The following ground terminal symbol is used in this user’s manual.

2.3.1 Auxiliary Power Requirement

DANGEROUS

Only the qualified personnel could do the wire connection work. Make sure the power supply is cut off and all the wires are electroless. Failure to observe it may result in severe injury.

There are 2 options for the Auxiliary Power Supply for the AcuDC 200 series meter:

1. Standard: 100 - 240Vac (50/60Hz) or 100-300Vdc

2. Low Voltage DC Option: 20-60Vdc The 2 options must be chosen according to the application. Please see the ordering information appendix for further details.

The first option is mainly used under illumination power conditions, the other is used under accumulator battery conditions. Typical power consumption of the

AcuDC 200 Series

meter is less than 2W. A regulator or a UPS should be used when the power supply undulates too much. Pin numbers for the auxiliary power are 1, 2 and 3 (L, N, G). A switch or circuit-breaker shall be included in the building installation, in close proximity to the equipment, and within easy reach of the operator. It shall be marked as the disconnecting device for the equipment.

Make sure the voltage of power supply is the same as what the meter needed for its auxiliary power.

Make sure the auxiliary power terminal G is connected to the earth ground terminal of the switch gear.

Note

1A FUSE

Power Supply

Fig 2.8 power supply

AcuDC 200

A fuse (typical 1A/250Vac) should be used in auxiliary power supply loop. No.3 terminal must be connected to the ground terminal of switch gear.

An isolated transformer or EMI lter should be used in the auxiliary power supply loop if there is power quality problem in the power supply.

1A FUSE

Power Supply

Groud

EMI FILTER

Fig 2.9 power supply under EMI lter

AcuDC 200

Choice of power supply wire could be AWG22-16 or 0.6-1.3mm2.

2.3.2 Voltage and Current Input

Voltage is directly input into the meter or via hall eect sensor. The wiring diagram is as follows:

AcuDC 200 Series

There are three wiring congurations for current:

1) Direct Input (shown in Fig 2.11);

2) Current Shunt option (shown in Fig. 2.12);

3) Hall Eect Sensor option (shown in Fig 2.13)

Fig 2.10 Voltage wiring

Vdc+

Vdc-

Voltage Hall Eect Sensor

+ +

Input

Voltage Wiring using

Voltage Hall Eect Sensor

Output

External DC Power

V+

AcuDC 240

V-

AcuDC 200 Series

vdc+ vdc-

Load

I-

AcuDC 200

I+

vdc+ vdc-

Load

shunt 75mV

I-

AcuDC 200

I+

Fig 2.11 Current direct input wiring Fig 2.12 Current input wiring with Shunt

AcuDC 200 Series

Vdc+

Vdc-

Load

Current Hall Eect Sensor

Output

External DC Power

AcuDC 200

Fig 2.13 Current input wiring with Hall Eect Sensor

Wiring diagrams shown in Fig 2.14, 2.15 and 2.16 represent dierent scenarios in which both voltage input and dierent current input options are used.

Fig 2.17 is voltage and current input with voltage and curret Hall Eect Sensors.

5 6

AcuDC 200

7 8

Vdc-

Vdc+

Output

Current Hall

Load

Fig 2.16 Voltage and Current input with Hall Eect Sensor

Eect Sensor

V+

V-

AcuDC 200

I+

I -

External DC Power

AcuDC 200

Load

Fig 2.15 Voltage and Current input with Shunt Fig 2.14 Voltage and Current direct input

Vdc-

Vdc+

Load

Fig 2.17 Voltage and Current input with Hall Eect Sensors

Voltage Hall Eect Sensor

Output

Input

External DC Power

Current Hall

Eect Sensor

Output

External DC Power

V+

V-

AcuDC 200

I+

I -

AcuDC 200 Series

Current direct input wiring is used for current smaller than 10A, the current signal wire choose AWG 15~16 or 1.5~2.5 mm2 or greater corss section. Current wiring using shunt method is used for current larger than 10A, the current signal wire choose AWG 15~16 or 1.5~2.5mm2 or the same resistance rate wire.

2.3.3 I/O Setting

Digital Input

External power supply is required for the 4 Digital Inputs (if equipped) of the AcuDC 220 Series. Input terminals are DI1+(9), DI2+(10), DI3+(11), DI4+(12), DIC(13). The circuit drawing of the digital input is simplied as g 2.17.

16~30Vdc

DI+

COM

Photo Coupler

OUT

AcuDC 200

Fig 2.18 Simplied DI input circuit

The external power supply voltage range for DI is from 16Vdc to 30Vdc. In order to compensate for interference, voltage of the external power supply may be higher when the DI's load is located at a distance; however, the maximum currert for the circuit must not be over 20mA. Wires with cross-section of 0.6~1.5mm2 (AWG 16~22) should be used for DI.

Relay Output

Two relay outputs (RO), R11,R12 (terminal 16, 17) and R21, R22 (terminal 18,19), can be added to the meter as options.

ROs can be used as remote control electric switches in power systems. Relay type is mechanical Form A contact with 3A/250V or 3A/30Vdc. A mediate relay is recommended in the output circuit as in Fig 2.18.

AcuDC 200 Series

auxiliary power

R11

mediate relay

AcuDC 200

R12

wires of mediate relay

Fig 2.19 Relay Output

The two relays in AcuDC 200 Series can be used to control eld switches or other devices. The maximum mechanical response time for the relay is 3ms. Three output modes are available: latching, momentary and alarming. For latching mode, two output status are available: "ON" and "OFF". For momentary mode, output of the relay changes from "OFF" to "ON" for a time interval of "Ton" then goes back to "OFF". "Ton" can be set from 30~5000ms. Output mode and pulse width can only be set through communication. The alarming mode will be discussed in detail in the following chapter under the "alarming" section. The wire of relay output should be chosen between AWG22 (0.5mm2)~AWG16 (1.5mm2)

Analog Output

One analog output (AO) channel can be added to the AcuDC 200 meter as an option. Two types of AO signals are available: 4-20mA or 0~5V. Each meter can only support one type of output (either 4~20mA option or 0~5V option). Please specify your analog output requirement before ordering.

Analog output can track voltage, current and power. The output range is xed(4~20mA or 0~5V),but the input range can be set due to dierent applications. Setting procedure is as follows:

Analog output settings can be modified by pressing the front panel keys on all AcuDC 200 Series models. In addition to front panel key pressing, AcuDC 220 Series' setting can be modied using RS485 communication.

1. Select track object: voltage, current or power.

2. Set tracking for the upper and lower limit. Maximum upper limit values for voltage, current and power are 600V, 9999A, 6000kW respectively. The upper limit must be less than the maximum upper limit value and greater than the lower limit

AcuDC 200 Series

value. The lower limit must be equal to or greater than 0. Appropriate upper and lower limit settings help to increase tracking accuracy and eciency.

3. The relationship among AO output(out), upper limit(U) and lower limit(L) and measuring value(M) is as follows:

1): Voltage output option for AO: out=[(M-L)/(U-L)]*5V

2): Current output option for AO: out=4+[(M-L)/(U-L)]*16mA

Two examples will be used to demostrate the above two relationships.

AO tracking object and its setting is as follows:

Table 2.3 Tracking object and its Setting number

Setting number Tracking object

0 Voltage 1 Current 2 Power

1. Example 1: Voltage output option for AO

Set AO to track voltage, upper limit is 600V, lower limit is 0, when the measuring value is 300V, the AO output should be:

out=[(M-L)/(U-L)]*5V=[(300-0)/(600-0)]*5V=2.5V.

2. Example 2: Current output option for AO

Set AO to track power, upper limit is 10kW, lower limit is 4kW, when the measuring value is 6kW, the AO output should be:

out=4+[(M-L)/(U-L)]*16mA=4+[(300-0)/(600-0)]*16mA=9.333mA.

Note:

1. Upper limit must be greater than lower limit.

2. If measuring value is less than the lower limit, the output will be 0V/4mA. If the measuring value is greater than the upper limit, the output will be 5 V/20mA.

AcuDC 200 Series

Vout

AcuDC 200

VCC

Vout

Load

AcuDC 200

VCC

Voltage Output Current Output

Fig 2.20 Analog Output

Output Capability:

4~20mA, Max Load Resistance 500 Ohm; 0~5 V, Max Output Current 20mA.

2.3.4 Communication

AcuDC 200 series uses RS485 serial communication and the Modbus-RTU protocol. The terminals of communication are A, B, and S (20, 21, 22). A is dierential signal +, B is dierential signal - and S is connected to shield of twisted pair cable. Up to 32

Load

devices can be connected on a RS485 bus. Use good quality shielded twisted pair

主机

232/485转换器

单点接大地

屏蔽双绞线

防反射电阻

EV150 EV150 EV150

cable, AWG22 (0.5mm2) or larger. The overall length of the RS485 cable connecting all devices cannot exceed 1200m (4000ft). AcuDC 200 is used as a slave device of master like PC, PLC, data collector or RTU. If the master does not have an RS485 communication port, a converter (such as a RS232/RS485 or a USB/RS485 converter) will be required.

Typical RS485 network topologies include line, circle and star (wye).

1. Line AcuDC 200 meters are connected one by one (daisy chain format) from the master in the RS485 net as in g 2.20.

232/485 Converter

Ground

Shielded Cable

AcuDC 200

Fig 2.21 Line mode

AcuDC 200 AcuDC 200

AcuDC 200 Series

Anti-reecting Resistor

AcuDC 200 Series

主机

232/485转换器

单点接大地

屏蔽双绞线

EV190

EV190 EV190

EV190

EV190EV190

As shown in Fig 2.20, an anti signal reecting resistor (typical value 120~300 ohm /0.25W) is added to the end of the circuit beside the last AcuDC 200 meter if the communication quality is distorted.

2. Circle

AcuDC 200 meters are connected in a closed circle for the purpose of high reliability. No anti signal reecting resistor is needed for circle mode.

232/485 Converter

Ground

Shielded Cable

AcuDC 200

Fig 2.22 Circle mode

AcuDC 200

3. Star

主机

232/485转换器

单点接大地

屏蔽双绞线

EV150

When connecting AcuDC 200 meters in the Wye mode, an anti signal reflecting resistor may be needed at the end of each line for better communication quality.

AcuDC 200 Series

232/485 Converter

Ground

A few points of recommendation for high quality communication are as follows:

Good quality shielded twisted pair of cable AWG22 (0.6mm2) or larger is very



important.

Shielded Cable

AcuDC 200

Fig 2.23 Star mode

AcuDC 200

Anti-reecting Resistor

AcuDC 200

AcuDC 200 Series

The shield of each segment of the RS485 cable must be connected to the ground



at one end only.

Make sure the right connection of each point.



Avoid T connection at each point.



Keep cables away as much as possible from sources of electrical noise. An anti



signal reecting resistor (typical value 120~300ohm/0.25W) is normally added to the end of the circuit beside the last meter if the communication quality is distorted.

Use RS232/RS485 or USB/RS485 converter with optical isolated output and surge



protection

Chapter 3 Basic Operation and Setup

3.1 Display Panel and Keys

3.2 Real-Time Metering Mode

3.3 Parameter Setting Mode

AcuDC 200 Series

Kwh

KWAV

2 3 4

addr bps

max

min

3.1 Display Panel and Keys

The front of the meter consists of a LCD display panel and four control keys. All the display segments are illustrated in g 3.1.

Fig 3.1 All Display Segments

Table 3.1 Display Panel Description

Numer Display Description

1 Data and Parameters Display metering data in metering mode.

2 Unit Icon Indicating metering data unit, "V" for voltage, "A" for current,

"KW" for Power, "Kwh" for Energy.

3 Limit Sign Upper/Lower limit value settings for AO. 4 Digital Input Indicator No.1 to No.4 switches indicate status for DI1 to DI4 respectively. 5 Parameter Icon "SET" icon and one of the following icons will be on at the

6 Time for Backlight

7 Communication Icon

same time in the setting mode. "addr" stands for device communication address setup; "bps" stands for communication rate setup; "A" stands for shunt current; "V" stands for shunt voltage. When setting up AO tracking object, "A" stands for tracking current and "V" stands for tracking voltage.

When "

When" established between the meter and the master device.

" icon is on, it indicates the time set for backlight.

" blinks, it indicates that communication is

Users can read real-time metering data, set parameters and navigate the meter using the four control keys:

, E, P and V/A from left to right respectively. The four





keys are located underneath the key cover on the meter front.

Note: This manual is written based on the AcuDC 223 (with full options) model. Some real-time metering display and parameter settings may not be available on certain models.

AcuDC 200 Series

3.2 Real-Time Metering Mode

Depending on model, the AcuDC 200 Series meter can display real-time metering data such as voltage, current, power and energy. When the meter is powered up, the default display parameter is either voltage or current (depends on model). LCD display backlight will turn on for the preset amount of time when any one of the four keys is pressed.

Press V/A: First screen: Voltage display page.

Voltage display: U=220.3V, Communication

Fig 3.2 Voltage Display

Fig 3.3 Current Display

established; DI1 to DI4 are in the "OFF" state.

Second screen: Current display page.

Current display: As in fig 3.3, I=9.487A. DI2 and DI4 are "ON" whereas others are "OFF". Note: Communication icon blinks when the meter is communicating with the master

device. The blinking speed is relative to the data transfer rate. The faster the icon blinks, the higher the transfer rate is.

Press P: Power display page.

The picture shows that: P=350.6KW; DI1,DI3 are close; DI2, DI4 are open. Communication established.

Fig 3.4 Power display

Press E: Energy display page

The picture shows: E=32768.9Kwh; all DIs are open. Communication established.

Note: When the energy is greater than

Fig 3.5 Energy display

99999.9Kwh, it will reset to 0 automatically.

3.3 Parameter Setting Mode

AcuDC 200 Series

In metering mode, Press

and V/A to go to the parameter setting mode.





AcuDC 200 Series

addr

Press

to move cursor from left to right. The digit will be ashing when the cursor





moves to it. Press E to increase 1 once a time. Press P to decrease 1 once a time. Press V/A to store the current setting and go to next screen. In any screen, press

and V/A at the same time to exit the parameter setting mode.





Parameter setting mode is password protected. Before entering the password and getting into the parameter setting mode, the meter's device communication address will

Fig 3.6 Local address

display for 3 seconds as shown in Fig 3.6

A four digit password (0000 to 9999) is required everytime before accessing the parameter setting mode. The default password is 0000. The meter will return to

Fig 3.7 Password input

the metering mode if a wrong password is

entered. Password input page shown in Fig

3.7.

First Screen: Communication address setting.

addr

The address can be any integer between 1 and 247. As in fig 3.8, the communication address is 84. To change the address, press

to move cursor, press P to increase the



Fig 3.8 Communication Address Setting



value by 1 and press E to decrease value by 1. Press V/A to store the current address and go to the next setting screen. Press V/A to go to the next screen if there is no need to change the address. Note: No more than two meters can have the same communication address on the same communication line according to the Modbus-RTU protocol.

The second screen: Baud rate setting page. Modbus-RTU uses 8 data bit, no parity, 1 start bit and 1 stop bit. Baud rate can be selected from one of the five values:1200, 2400, 4800, 9600, 19200bps. Press P or E

Fig 3.9 Baud rate setting page

to select a suitable baud rate. Press V/A to go to next screen. Same baud rate should be used for all the meters on the same communication line.

AcuDC 200 Series

The third screen: Shunt / Hall Effect Sensor current input full range setting. The value input is the full range current value for the Shunt or Hall Eect Sensor. AcuDC 200 series

Fig 3.10 Shunt current input full range setting

support 1~9999A shunt. The value range in this screen is 1~9999.

The fourth screen: Shunt / Hall Eect Sensor output voltage setting. The value input is the full range output voltage value for the Shunt or Hall Effect Sensor. For instance, 100mV

Fig 3.11 Shunt/Hall Eect Sensor output setting

shunt, enter 100; 5V Hall Eect Sensor, enter 50; 20mA Hall Eect Sensor, enter 20.

AcuDC 200 series support 50~100mV arbitury voltage shunt. If it exceeds this range, the value will be reset to default 100. Our recommendation for shunt is 100mV shunt, it is better for accuracy.

The value here for shunt, the range is 50~100; for volage Hall Effect Sensor, the range is 1~100; for current Hall Eect Sensor, the range is 4-100. 4~XmA and 0~XmA

types are not exchangable.

Fig 3.12 AO output setting

Max

Min

SET

Fig 3.13 AO tracking lower limit

AcuDC 200 Series

The fifth screen: AO output setting. Please refer to “Analog output” in chapter two for detail information.

The sixth screen: AO tracking lower limit setting page.

The seventh screen: AO tracking upper limit page.

Fig 3.14 AO tracking upper limit

AcuDC 200 Series

Kwh

The eighth screen: Energy clear page. It displays “CLE” and a digit at the same time. No change will be made if the digit is set to 0. Energy will be reset after pressing V/A if the

Fig 3.15 Energy clear page

digit is set to 1.

The ninth screen: Backlight "ON" time setting page. The LCD display backlight will turn "OFF" after inactive for a period of time to conserve energy. The "ON" time can be set from 0 to

Fig 3.16 Back light “ON” time

120 minute. The backlight will always be "ON"

if the setting value is 0. As in g 3.16, the setting time of the backlight is 5 minutes. The backlight will automatically turn "OFF" if no key activation within 5 minutes.

The tenth screen: only when the meter voltage wiring is via voltage Hall Effect Sensor, there will be this screen. Otherwise, there is no such screen. The voltage input range is 0~1200Vdc.

Fig 3.17 Voltage Hall Eect Sensor setting

Fig 3.17 shows the voltage input is 1000V.

The tenth screen: Password setting page. This is the last screen in setting mode. The password can be changed in this page. It is important to remember the new password.

Fig 3.17 Password setting

the rst setting page. After nishing all of the settings, press

As in g 3.17, the password is 0001. Press V/A

to store the new password and return back to

and V/A keys to exit





the setting mode.

Alarming

AcuDC 200 Series meter can be used for alarming. Over/under limit alarm will be triggered when the metering parameter value falls outside of the preset value limit and does not resume back to normal within the preset time delay interval. When an alarm condition is met, the alarm channel relay will be activated (switch close) and the LCD display backlight will ash. Alarm setting steps are as follows:

AcuDC 200 Series

1. Set RO output mode to alarming (2).

2. Select alarming object. For example: voltage for AcuDC 221 (1); current for AcuDC 222 (2).

3. Set alarming delay time (0~255s)

4. Set alarming limit value.

5. Sign of inequality selection.

6. RO alarm channel selection (0: RO1; 1: RO2; 2: RO1, RO2).

Alarming parameters

Address Parameter Range

0105H RO1 output mode 0-level, 1-pulse, 2-alarming 0106H Pulse width of RO1 30~5000ms 0107H RO2 output mode 0-level, 1-pulse, 2-alarming 0108H Pulse width of RO2 30~5000ms 010BH Alarming object 0: no; 1: voltage; 2: current; 3: power

010CH Sign of inequality 0: <, 1: >

010FH 0100H

010DH Alarming delay time 0~255 s 010EH RO alarm channel 0~RO1; 1~RO2; 2~RO1,RO2

Alarming value

current: 0~9999.0

voltage: 0~600.0

power: 0~ 6000.0

Here is an example to show how this works

If we want to trigger an alarm at RO1 when the current is over 10.005A with a time delay of 15 seconds, we should set the alarm parameters as follows:

1) Set RO1 output mode to 2 (This means RO1 works under alarming mode).

2) Set alarming object to 2 (current). The alarming limit value should be set as

10.005.

3) Set alarming delay time as 15 seconds.

4) Set sign of inequality to 1.

5) Set RO alarm output channel as 0.

After setting up the alarm parameters, when the alarm condition is met (current goes above 10.005A for 15 seconds), RO1 will be activated (contact closed) and the

AcuDC 200 Series

LCD display backlight will ash.

Note: If "RO alarm output channel" is set as 2 and RO1 is set to alarming mode, when an alarm condition is met, the alarm signal will be sent to both of the relay outputs but only RO1 will be triggered (since RO2 is not in alarming mode). If none of the relay output is set to alarming mode, no relay will be triggered.

Chapter 4 Communication and Setup

4.1 Modbus Protocol Introduction

4.2 Communication Format

4.3 AcuDC 200 Address Table

AcuDC 200 Series

4.1 Modbus Protocol Introduction

The ModbusTM RTU protocol is used for communication in the AcuDC 200 series meter. Data format and error check methods are dened in Modbus protocol. The half duplex query and respond mode is adopted in Modbus protocol. There is only one master device in the communication net. The others are slave devices, waiting for the query of the master. Only the master device can communicate with slave devices. The slave devices cannot communicate with each other. They can only response to the query of master device.

1. Transmission mode

The mode of transmission denes the data structure within a frame and the rules used to transmit data. The mode is dened in the following which is compatible with Modbus RTU Mode*.

Coding System 8bit Parity None



Start bit 1bit Stop bit 1bit



Data bits 8bit Error checking CRC



2. Protocol

Framing

Table 4.1 Data Framing

Address Function Data Check

8-Bits 8-Bits N x 8-Bits 16-Bits

Address Field

The address field of a message frame contains eight bits. Valid slave device addresses are in the range of 1~247 decimal. 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 eld of the response to let the master know which slave is responding.

Function Field

The function code eld of a message frame contains eight bits. Valid codes are in the range of 1~255 decimal. When a message is sent from a master to a slave device the function code eld tells the slave what kind of action to perform.

AcuDC 200 Series

Code Meaning Action

01 Read Relay Output Obtain current status of Relay Output 02 Read Digital Input Obtain current status of Digital Input 03 Read Registers Obtain current binary value from one or more registers 05 Control Relay Output Force relay state to "ON" or "OFF"

16 Preset Multiple-Registers

Data Field

The data eld is constructed using sets of two hexadecimal digits, in the range of 00 to FF hexadecimal. The data eld of messages sent from a master to slave devices contains additional information which the slave must use to take the action dened by the function code. This can include items like discrete and register addresses, the quantity of items to be handled, and the count of actual data bytes in the eld.

Check Field

Check field is used in the master and slave device to find errors in the data transmitting. Inaccuracy may occur within a data group due to noise or other

Table 4.2 Function Code

Place specic binary values into a series of consecutive Multiple-Registers

interference when being transitted from one device to another. The check field guarantees the device does not respond to error messages in order to improve system reliability and eciency. CRC16 error check method is adopted in Modbus Protocol.

3. Error Check Method

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 eld 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. 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 eld. If the two values are not equal, an error will be reported. 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

AcuDC 200 Series

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 lled into the most signicant bit (MSB) position. The LSB is extracted and examined, if the LSB equals to 1, the register is exclusive ORed with a preset, xed 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 nal 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 the low-byte, is the CRC value. When the CRC is appended to the message, the low-order byte is appended rst, followed by the high-order byte.

4.2 Communication Format

All examples shown in this chapter follows the same format of Table 4.3. (All data is express in Hex)

Table 4.3 Protocol Format

Addr Fun

11H 03H 01H 00H 00H 08H 47H 60H

Data start

reg HI

Data start

reg LO

Data #of

regs HI

Data #of

regs LO

CRC16HICRC16

The meaning of each abbreviated word is,

Addr: Address of slave device

Fun: Function code

Data start reg HI: Start register address high byte

Data start reg LO: Start register address low byte

Data #of reg HI: Number of register high byte

Data #of reg LO: Number of register low byte

CRC16 HI: CRC high byte

CRC16 LO: CRC low byte

AcuDC 200 Series

1. Read Status of Relay (Function Code 01)

Query This function code is used to read status of relay in the meter. 1=On 0=O There are 2 relays in the meter. The address of each relay is: Relay1=0000H and Relay2=0001H.

The following query is to read the relay status for the meter with communication address 17.

Table 4.4 Read the status of Relay1 and Relay2 Query Message

Addr Fun

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

DO start

reg HI

DO start

reg LO

DO #of regs HI

DO #of regs LO

CRC16HICRC16

Response

The meter response includes the meter address, function code, quantity of data byte, the data, and error checking. An example response to read the status of Relay1 and Relay2 bits is shown as Table 4.5. The status of Relay1 and Relay2 is

responding to the last 2 bits of the data. Relay1: bit0 Relay2: bit1

Table 4.5 Relay status responds

Addr Fun Byte count Data CRC16 HI CRC16 LO

11H 01H 01H 02H D4H 89H

The content of the data is,

7 6 5 4 3 2 1 0 0 0 0 0 0 0 1 0

MSB LSB (Relay 1 = OFF , Relay 2=ON)

2. Read Status of DI (Function Code 02)

Query 1=On 0=O

There are 4 DIs in the meter. The address of each DI is DI1=0000H, DI2=0001H, DI3=0002H and DI4=0003H. The following query is to read the 4 DI status of the meter with communication address 17.

AcuDC 200 Series

Table 4.6 Read the status of DI1~DI4 Query Message

Addr Fun

11H 02H 00H 00H 00H 04H 7BH 59H

DI start

addr HI

DI start

addr LO

DI numHIDI numLOCRC16HICRC16

Response

The AcuDC 200 response includes the AcuDC 200 address, function code, quantity of data characters, the data characters, and error checking. An example response to read the status of 4 DIs is shown in Table 4.7. The DI status corresponds to the last 4 bits of the data. DI1: bit0 DI2: bit1 DI3: bit2 DI4: bit3

Table 4.7 Read Status of DI

Addr Fu n Byte count Data0 CRC16 HI CRC16 LO

11H 02H 01H 03H E5H 49H

Data

7 6 5 4 3 2 1 0 0 0 0 0 0 0 1 1

MSB LSB

3. Read Data (Function Code 03)

Query

This function allows the master to obtain the measurement results from the meter. Table 4.8 is an example to read the measured data from slave device number 1, the data address for voltage V is 0200H.

Table 4.8 Read V Query Message

Addr Fun

01H 03H 02H 00H 00H 01H 85H B2H

Data start

addr HI

Data start

Addr LO

Data # of

regs HI

Data # of

regs LO

CRC16HICRC16

Response

The meter response includes the meter address, function code, quantity of data byte, data, and error checking. An example response to read V=0001H (0.01V) is shown in Table 4.9.

Table 4.9 Read V Message

Byte

Addr Fun

01H 03H 02H 00H 01H 79H 84H

DataHIDataLOCRC16HICRC16

count

AcuDC 200 Series

4. Control Relay (Function Code 05)

Query

This message forces a relay to either turn "ON" or "OFF". Any relay that exists within the meter can be forced to either "ON" or "OFF" status. Relay addresses start at 0000H (Relay1=0000H Relay2=0001H). The data value FF00H will set the relay on and the value 0000H will turn it o; all other values are illegal and will not aect that relay. The example below is a request to the meter number 1 to turn on Relay1.

Table 4.10 Control Relay Query Message

Addr Fun DO addr HI DO addr LO Value HI Value LO CRC16 HI CRC16 LO

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

Response

The normal response to the command request is to retransmit the message as received after the relay status has been altered.

Table 4.11 Control Relay Response Message

Addr Fun Do addr HI Do addr LO Value HI Value LO CRC16 HI CRC16 LO

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

5. Preset / Reset Multi-Register (Function Code 16)

Query

Function 16 allows the user to modify the contents of a multi-register. Any register that exists within the meter can have its contents changed by this message. The example below is a request to meter number 1 to preset alarming value(1000), alarming delay(4s), and alarming output to RO1.

Table 4.12 Preset / Reset Multi-Register Message

Addr Fun

01H 10H 01H 0BH 00H 03H 06H

Value1HIValue1LOValue2HIValue2LOValue3HIValue3LOCRCHICRC

07H D0H 00H 05H 00H 01H 82H 3DH

Data start

reg HI

Data start

reg LO

Data # of

reg HI

Data # of

reg LO

Byte Count

Response

The normal response to a preset multi-register request includes the slave address, function code, data start register, the number of registers and error checking.

AcuDC 200 Series

Table 4.13 Preset Multi-Registers Response Message

Addr Fun

01H 10H 01H 0B H 00H 03H F0H 36H

Data start

reg HI

Data start

reg LO

Data #of

reg HI

Data #of

reg LO

CRC16

4.3 AcuDC 200 Address Table

Metering data is stored in these register areas. Use Modbus function code 03 to read metering data.

Table 4.14 Metering data address table

Address Parameter Range Object Type Type of Access

0200H,0201H Voltage V Float R 0202H,0203H Current I Float R 0204H,0205H AO output Float R 0206H,0207H Power Float R

The relationship between the numerical value in the register of AcuDC 200 and the real physical value is shown in table below. (Rx is the numerical value in register of the meter)

CRC16

Parameter Relationship unit

Table 4.15 Metering data convert table

Voltage V Real =Rx V

Current I Real =Rx A

Power Real =Rx kW

Energy Real =Rx/100 kWh

AO output Real =Rx V or mA (related with AO pattern)

Parameter Setting

Function code: 03 for Reading,16 for Presetting

Table 4.16 System parameter address

Address Parameter Range

0100H Access Code 0~9999 Word R/W 0101H Address 1~247 Word R/W 0102H Baud rate 1200~19200 Word R/W

0103H

0104H

Shunt full range

current input

Shunt full range

output voltage

0~9999(A): input range of Shunt

/ Hall Eect Sensor

0: No shunt/HCT; 1~100: Full

range output of shunt / hall

eect sensor

0105H RO1 output mode 0-level, 1-pulse, 2-alarming Word R/W

Object

Type

Word R/W

AcuDC 200 Series

Type of

Access

AcuDC 200 Series

0106H Pulse width of RO1 30~5000ms Word R/W 0107H RO2 output mode 0-level, 1-pulse, 2-alarming Word R/W 0108H Pulse width of RO2 30~5000ms Word R/W

0109H AO output

0: no; 1: voltage;

2: current; 3: power

010AH Backlight "ON" time 0~120minute Word R/W

010BH Alarming object

0: no; 1: voltage;

2: current 3: power 010CH Sign of inequality 0: <, 1: > Word R/W 010DH Alarming delay time 0~255 s Word R/W 010EH RO alarm channel 0~RO1; 1~RO2; 2~RO1,RO2 Word R/W

010FH, 0110H Alarming value The same as reading data Float R/W 0111H, 0112H Lower limit of AO The same as reading data Float R/W 0113H, 0114H Upper limit of AO The same as reading data Float R/W 0115H, 0116H Energy presetting 0~9999999 Long R/W

0117H

0118H

Voltage Hall Eect

Sensor Input

Voltage Hall Eect

Sensor Output

0~1200V Word R/W

1~5V Word

Word R/W

R/W

Please refer to chapter 3 for more information.

Digital Iput (DI) Status:

Function code: 02 for Reading

Table 4.17 Digital Input (DI) Address

Address Parameter Range Object Type Type of Access

0000H DI1 1=ON, 0=OFF Bit R 0001H DI2 1=ON, 0=OFF Bit R 0002H DI3 1=ON, 0=OFF Bit R 0003H DI4 1=ON, 0=OFF Bit R

Relay Status and Control

Function code: 01 for Reading, 05 for Controlling.

Table 4.18 Relay Address

Address Parameter Range Objec t Type Type of Access

0000H DO1 1=ON, 0=OFF Bit R/W 0001H DO2 1=ON, 0=OFF Bit R/W

AcuDC 200 Series

Analog output:

Function code: 03 for Reading, 16 for Presetting.

Table 4.19 AO Address

Address Parameter Range Object Type Type of Access

0109H Transform object 0~2 Word R/W

Note:

1. Object type: Bit-binary bit, Word-unsigned integer of 16 bit, Integer-signed integer of 16 bit, Dword-unsigned integer of 32 bit.

2. Type of access: R-Read only; Relay Output (RO) status, Digital Input (DI) status and general measurement parameters can be read from memory using function code 01, 02 and 03 respectively. R/W - Read and Write; data can be read from and written into memory using function code 16. Control command can be written using function code 05. Writing to "Read only" eld is forbidden.

Appendix

Appendix A Technical Data and Specications

Appendix B Ordering Information

Appendix C Hall Eect Sensor Specications

Appendix D Revision Information

AcuDC 200 Series

1. Measurement

2. Communication

Isolate Voltage 2500Vac

Appendix A Technical Data and Specications

Parameter Accuracy Resolution Range

Voltage 0.2% 0.01V 0~600V Current 0.2% 0.005A 0.005~9999A

Power 0.5% 0.01W 0.01~6,000,000W

Energy 0.5% 0.1kWh 0.1~99999.9kWh

Parameter Description

Type RS485, Half Duplex, Optical isolated

Baud Rate 1200~19200bps

Protocol Modbus-RTU

Function

Read and Write setting parameters Read measuring data Execute operation instruction

3. Output

AcuDC 200 Series

Output Form Mechanical Contact, Form A

Relay Output (RO)

Max Load Voltage 250Vac/30Vdc Max Load Current 3A

Contact Resistance 100mΩ(Max)

Isolate Voltage 4000Vac

Contact Material silver alloy

Mechanical Endurance 5×10

cycles

Output Form latching or pulse (30 to 5000ms) or alarming

Analog output (AO)

Range 4~20mA or 0~5V

Resolution 12bit Load Capability 4~20 mA, 0~5 V Max Resistance 500Ω

Max Current 20mA

AcuDC 200 Series

4. Input

Hall Current Thruster (HCT) 0~5V, 0~4V, 0~20mA, 4~20mA

Power Consumption 2W(Max)

Input Voltage Range 16~30Vdc

Current

0~10A(Direct Input), 0~9999A(Extra current shunt or HCT, with

programmable range)

Shunt 50~100mV(Programmable)

Accuracy 0.2%

Voltage

Input Voltage 0~600V

Input Impedence 2MΩ

Load < 0.2W

Digital Input (DI)

Isolate Voltage 2500Vac rms

Input Type Wet contact (Contact with power supply)

Input Resistance 2K ohm (typical)

Max Input Current 20mA

5. Environment

Parameter Description

Humidity 0~95% Non-condensing

Temperature -25%⁰C~70⁰C

Package

Size 165mm×70mm×115mm

Weight 0.4Kg

6. Power Supply

Parameter Description

Input Option 1 100~240Vac, 50/60Hz; 100~300Vdc

Power Consumption 2W

Option 2 20~60 Vdc

AcuDC 200 Series

AcuDC 200

Appendix B Ordering Information

Aux. PowerSupply

CurrentVoltage

A0: Dierct Current Input(0~10Amp) A1: Current Shunt Input Option (50~100mV) A2: Hall Element Input Option(4~20mA) A3: Hall Element Input Option( 0~5V)

300V: Nominal Input Volage 300 Vdc 600V: Nominal Input Volage 600 Vdc 48V: Nominal Input Volage 48 Vdc

AcuDC 211(Voltage Meter,No communication) AcuDC 212(Current Meter,No communication) AcuDC 213 AcuDC 221(Voltage Meter, communication) AcuDC 222(Current Meter, communication) AcuDC 223(Multifuncion, communication)

AcuDC Series Meter Ordering Example: AcuDC 223 - 300V - A2 - P1 - 4DI- 2RO- AO1

5V: Via Hall Element Sensor (0-5V),ratio settable, Voltage Hall Element Sensor can be ordered

(Multifuncion,No communication)

DI Opution

0DI: No Digital Input 4DI: 4 Digital Input (AcuDC 221/222/223 Only)

P1: 100 - 240Vac，50/60Hz，100- 300Vdc P2: 20 - 60Vdc

RO Opution

AO Opution

0AO: No Analog Output AO1: 4-20mA AO2: 0-5V

0RO: No Relay Output 2RO: 2 Relay Output (AcuDC 221/222/223 Only)

Voltage Hall Eect Sensor Ordering Information Current Hall Eect Sensor Ordering Information

Special order

Please contact your local Accuenergy

Representative for further details

Note:

1. When the input voltage is above 600V, or the system design requires an isolation, the voltage input can

be selected as Via Hall Eect Sensor (0-5 V). The Voltage Hall Eect Sensor requires 0-5 V.

2. Hall Eect Sensors need external ±15Vdc power supply, which the customer must provide.

Special order

Please contact your local Accuenergy

Representative for further details

AcuDC 200 Series

Appendix C Revision Information

Revision Date Description

1.0 20080215 First version

1.02 20090305 Add content at P36 and P60 ;

1.03 20090610 Revise content

1.20 20100422 Revise content

1.21 20100830 Change the address of Energy parameter

1.22 20120727 Update the wiring diagram

Add HCT content in this manual

Update the method for generating CRC value Remove hall eect sensor ordering information and specications

Accuenergy Corporation

Los Angeles-Toronto-Beijing North America Toll Free: 1-877-721-8908 Web: www.accuenergy.com Email: marketing@accuenergy.com

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Frequently Asked Questions

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