Datakom DKM-409 User Manual

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[email protected] http://www.datakom.com.tr

Tel: +90-216 466 84 60 Fax: +90-216 364 65 65

DKM-409 NETWORK ANALYSER

WITH HARMONIC MEASUREMENT AND SCOPEMETER

INTRODUCTION

The DKM-409 is a precision instrument designed for displaying various AC parameters in 3-phase distribution panels.

Thanks to its isolated RS-485 Modbus RTU communication port, the device is free from ground potential difference issues and measured parameters are safely transferred to factory and building automation systems.

The power supply of the unit is isolated, thus the same device can be used in both 230/400V and 120/208V systems.

The graphic screen allows display of waveforms and harmonic analysis graphs.

Various display screens can be scrolled automatically. The user configurable screen where any measured parameter set can be displayed, transforms the unit to a custom designed measurement panel.

FEATURES

True RMS measurements Harmonic distortion display ( 31 harmonics) Oscilloscope, waveform display Max demand display User configurable display screen Fully isolated RS-485 serial port MODBUS-RTU communication 2 configurable relay outputs Energy pulse output capability Optically isolated, configurable digital inputs Switched dual active-reactive power counters Independent mains/generator energy metering Configurable user counters Voltage transformer ratio for MV applications Password protected front panel programming High visibility, 128x64 pixels graphic LCD Reduced panel depth Wide operating temperature range Sealed front panel (IP54) Plug-in connection system

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SAFETY NOTICE

Failure to follow below instructions will

result in death or serious injury

•

Electrical equipment should be installed only by qualified specialist. No responsibility is assured by the manufacturer or any of its subsidiaries for any consequences resulting from the non-compliance to these instructions.

•

Check the unit for cracks and damages due to transportation. Do not install damaged equipment.

• Do not open the unit. There is no serviceable parts inside.

•

Fuses must be connected to the power supply and phase voltage inputs, in close proximity of the unit.

•

Fuses must be of fast type (FF) with a maximum rating of 6A.

•

Disconnect all power before working on equipment.

•

When the unit is connected to the network do not touch terminals.

•

Short circuit terminals of unused current transformers.

•

Any electrical parameter applied to the device must be in the range specified in the user manual.

•

Do not try to clean the device with solvent or the like. Only clean with a dry cloth.

•

Verify correct terminal connections before applying power.

•

Only for front panel mounting.

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TABLE OF CONTENTS

Section

1. INSTALLATION

1.1. FRONT / REAR PANELS

1.2. MECHANICAL INSTALLATION

1.3. ELECTRICAL INSTALLATION

1.4. CONNECTION DIAGRAM FOR 230/400V NETWORK

1.5. CONNECTION DIAGRAM FOR 120/208V NETWORK

2. PUSHBUTTON FUNCTIONS

3. DISPLAY NAVIGATION

4. DISPLAY SCREEN

4.1. DISPLAY SCREEN DETAILS

4.2. PHASE SEQUENCE DISPLAY

5. DISPLAY SYMBOLS

6. SETTING AUTO-SCROLL MODE

7. RESETTING VISUAL WARNINGS

8. DEVICE CONFIGURATION

8.1. INTRODUCTION

8.2. ADJUSTING THE LCD CONTRAST

8.3. LANGUAGE SELECTION

8.4. CURRENT TRANSFORMER RATIO

8.5. VOLTAGE TRANSFORMER RATIO

8.6. MODBUS ADDRESS

8.7. CHANGING THE PASSWORD

8.8. MODIFYING THE SERIAL NUMBER

8.9. USER DISPLAY PAGE CONFIGURATION

8.10. CONFIGURING AN ITEM’S LOW OR HIGH LIMIT

8.11. INPUT CONFIGURATION

8.12. RELAY CONFIGURATION

8.13. RESETTING A COUNTER

8.14. RESETTING DEMAND VALUES

8.15. OVERCURRENT DETECTOR CONFIGURATION

8.16. PHASE SEQUENCE FAILURE

8.17. RESETTING LOW/HIGH LIMITS

8.18. RETURN TO FACTORY SETTINGS

8.19. CALIBRATION

9. MODBUS COMMUNICATIONS

9.1. DESCRIPTION

9.2. MODBUS REGISTERS

9.3. WARNING REGISTERS

10. TECHNICAL SPECIFICATIONS

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1. INSTALLATION

Before installation:

• Read the user manual carefully, determine the correct connection diagram.

• Remove all connectors and mounting brackets from the unit, then pass the unit through

the mounting opening.

• Put mounting brackets and tighten. Do not tighten too much, this can brake the enclosure.

• Make electrical connections with plugs removed from sockets, then place plugs to their sockets.

• Note that the power supply terminal is separated from measurement terminals.

Below conditions may damage the device:

• Incorrect connections.

• Incorrect power supply voltage.

• Voltage at measuring terminals beyond specified range.

• Current at measuring terminals beyond specified range.

• Connecting or removing data terminals when the unit is powered-up.

• Overload or short circuit at relay outputs

• Voltage applied to digital inputs over specified range.

• High voltage applied to communication port.

Below conditions may cause abnormal operation:

• Power supply voltage below minimum acceptable level.

• Power supply frequency out of specified limits

• Phase order of voltage inputs not correct.

• Current transformers not matching related phases.

• Current transformer polarity incorrect.

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1.1 FRONT / REAR PANELS

1.2 MECHANICAL INSTALLATION

Panel Cutout Required Panel Depth

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1.3 ELECTRICAL INSTALLATION

Do not install the unit close to high electromagnetic noise emitting devices like contactors, high current busbars, switchmode power supplies and the like.

Although the unit is protected against electromagnetic disturbance, excessive disturbance can affect the operation, measurement precision and data communication quality.

• ALWAYS remove plug connectors when inserting wires with a screwdriver.

• Fuses must be connected to the power supply and phase voltage inputs, in close

proximity of the unit.

• Fuses must be of fast type (FF) with a maximum rating of 6A.

• Use cables of appropriate temperature range.

• Use adequate cable section, at least 0.75mm2 (AWG18).

• For current transformer inputs, use at least 1.5mm2 section (AWG15) cable.

• The current transformer cable length should not exceed 1.5 meters. If longer

cable is used, increase the cable section proportionally.

• Follow national rules for electrical installation.

• Current transformers must have 5A output.

• For the RS-485 connection, use appropriate shielded twisted wire cable.

Communication quality will depend highly on the cable used.

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1.4 CONNECTION DIAGRAM FOR 230/400V NETWORK

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1.5 CONNECTION DIAGRAM FOR 120/208V NETWORK

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2. PUSHBUTTON FUNCTIONS

Three buttons on the front panel provide access to configuration and measurement screens.

BUTTON FUNCTION

Previous screen or Decrease related value (configuration mode)

Next screen or Increase related value (configuration mode)

Changes voltage and current channels for

• scopemeter display

• harmonic display

• digital harmonic display

Available channels: U12-U23-U31- V1-V2-V3- I1-I2-I3

HELD PRESSED FOR 3 SEC:

enable/disable auto-scroll function

HELD PRESSED TOGETHER FOR 3 SEC:

• Clears visual warning condition if any.

• If no warning condition, enters configuration mode.

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3. DISPLAY NAVIGATION

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4. DISPLAY SCREEN

4.1 DISPLAY SCREEN DETAILS

Display 1

DATAKOM LOGO Software version

Display 2

U1-2 (V) U2-3 (V) U3-1 (V) Frequency (Hz)

Display 3

V1-N (V) V2-N (V) V3-N (V) Frequency (Hz)

Display 4

I1 (A) I2 (A) I3 (A) U1-2 (V)

Display 5

P1 Active power (kW) P2 Active power (kW) P3 Active power (kW) Total Active Power

Display 6

Q1Reactive power(kVAr) Q2Reactive power(kVAr) Q3Reactive power(kVAr) Total Reactive Power

Display 7

Total active power (kW) Total reactive power (kVAr) Power factor Total active energy (kWh)

Display 8

Total active power (kW) Total reactive power (kVAr) Power factor Total reactive energy (kVArh)

Display 9

Total apparent power (kVA) Total active power (kW) Total reactive power (kVAr) Power factor

Display 10

I1 (A) demand value I2 (A) demand value I3 (A) demand value P (kW) demand value

Display 11

USR1 – User counter 1 USR2 – User counter 2 USR3 – User counter 3 USR4 – User counter 4

Display 12

CT x VT ratio Transmission speed (bps) Modbus address Instrument serial number

Display 13

Time Display Screen Channel time curve Channel frequency Channel value (V/A)

Display 14

Harmonic Display Screen Channel harmonic bars Channel frequency Channel value (V/A)

Display 15

Channel Harmonic List (1-31 %)

Display 16

User configurable screen Default values are: USR1 USR4 – User counters

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4.2 PHASE SEQUENCE DISPLAY

The unit checks continuously the sequence of AC phase voltages.

If voltages are in the correct sequence, below symbol appears on voltage display pages, namely pages 2 and 3

If voltages are in wrong order, the symbol disappears.

The effect of phase sequence failure is configurable. It can be a visual warning, a relay output or nothing.

To learn more about the phase sequence failure output, please review the section PHASE SEQUENCE FAILURE in the CONFIGURATION menu.

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5. DISPLAY SYMBOLS

SYMBOL DESCRIPTION

ver

Software version

U12

Phase 1 to phase 2 AC RMS voltage value

U23

Phase 2 to phase 3 AC RMS voltage value

U31

Phase 3 to phase 1 AC RMS voltage value

FRQ

Frequency value

V1

Phase 1 to Neutral AC RMS voltage value

V2

Phase 2 to Neutral AC RMS voltage value

V3

Phase 3 to Neutral AC RMS voltage value

I1

Phase 1 AC RMS current value

I2

Phase 2 AC RMS current value

I3

Phase 3 AC RMS current value

P1

Phase 1 active power (kW) value

P2

Phase 2 active power (kW) value

P3

Phase 3 active power (kW) value

∑P

Total active power (kW) value

Q1

Phase 1 reactive power (kVAr) value

Q2

Phase 2 reactive power (kVAr) value

Q3

Phase 3 reactive power (kVAr) value

∑Q

Total reactive power (kVAr) value

S1

Phase 1 apparent power (kVA) value

S2

Phase 2 apparent power (kVA) value

S3

Phase 3 apparent power (kVA) value

∑ S

Total apparent power (kVA) value

Cos1

Phase 1 power factor

Cos2

Phase 2 power factor

Cos3

Phase 3 power factor

∑ Cos

Power factor

Pc1

Active power counter 1 (kWh)

Pc2

Active power counter 2 (kWh)

Qc1

Reactive power counter 1 (kVArh)

Qc2

Reactive power counter 2 (kVArh)

I1mx

Phase 1 maximum apparent current value

I2mx

Phase 2 maximum apparent current value

I3mx

Phase 3 maximum apparent current value

Pmax

Total active power maximum value

USR1

User counter 1

USR2

User counter 2

USR3

User counter 3

USR4

User counter 4

VTxIT

Current Transformer Ratio x Voltage Transformer Ratio

BAUD

Transmission speed (bps)

MODBUS

Modbus node address

SERIAL

Instrument serial number

I

Power factor is inductive

C

Power factor is capacitive

H1-H31

Harmonic values

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6. SETTING AUTO-SCROLL MODE

The unit offers the possibility of automatically scanning of all display screens.

In order to enable auto-scroll function hold the SET button pressed for 3 seconds.

In order to disable auto-scroll function hold the SET button pressed for 3 seconds.

When the auto-scroll is enabled, the unit will switch to the next screen every 5 seconds.

7. RESETTING VISUAL WARNINGS

In order to reset visual warnings, hold both MENU buttons pressed for 3 seconds. If no fault conditions exists this will enable the configuration menu.

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8. DEVICE CONFIGURATION

8.1 INTRODUCTION

In order to offer the maximum flexibility to the user, the unit has several configurable parameters.

• Device configurations

 LCD Contrast  Language selection  Modbus node address  User display screen

configuration

• Input/Output Configurations

 Reference value setting  Input Configurations  Relay Configurations

• Line Configurations

 Clearing Counters  Resetting demand values  Overcurrent configuration  Setting the current transformer ratio  Setting the voltage transformer ratio  Input calibration

• Return to factory settings

In order to enable the configuration menu, hold both MENU buttons pressed for 3 seconds.

When the configuration mode is entered, the password entry screen will be displayed.

A 4 digit password must be entered using buttons. The factory default password is “9876”. Each digit is adjusted with MENU buttons and the next digit is selected with SET button.

When the configuration mode is entered, a list of available configuration topics will be displayed as in the below screen.

In order to exit the configuration menu, hold both MENU buttons pressed for 3 seconds. If no button is pressed, the unit will automatically close the configuration menu after 30 seconds.

Navigation on the list is made with

and buttons. Selected configuration topic is shown in reverse video (black on white). In order to enter

inside a configuration topic, please press button.

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8.2 ADJUSTING THE LCD CONTRAST

Select “

LCD CONTRAST

” on “

CONFIGURATION

MENU”. Change the contrast value with and

until best visibility is obtained and then press

to save new LCD contrast value and return

back to “CONFIGURATION MENU”. .

8.3 LANGUAGE SELECTION

Select “

LANGUAGE

” on “

CONFIGURATION

MENU”. Change language with and

until the desired language is selected and then

press to save the new language and return to “CONFIGURATION MENU” again.

8.4 CURRENT TRANSFORMER RATIO

For the correct current measurement, the current transformer ratio has to be set properly.

The secondary of the current transformer is always supposed to be 5 Amps. Only the primary value is set.

Select “CRNT TRF RATIO” on “CONFIGURATION MENU”.

Then adjust the current transformer ratio with

and buttons until required value then press

button to save the new current transformer

ratio and return to “CONFIGURATION MENU”.

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8.5 VOLTAGE TRANSFORMER RATIO

If a voltage transformer is used, then its ratio needs to be set to the unit.

The voltage transformer ratio is defined as primary voltage / secondary voltage. The secondary is always supposed 1.0. Thus only the primary is programmed.

Select “VOLT TRF RATIO” on “CONFIGURATION MENU”.

Adjust the voltage transformer ratio with and

buttons until required value then press

button to save new voltage transformer ratio and return to “CONFIGURATION MENU”.

8.6 MODBUS ADDRESS

Select “

MODBUS ADDRESS

” on

“CONFIGURATION MENU”. Change the modbus

node address with and until the

desired address is displayed and then press to save the new modbus node address and return to “CONFIGURATION MENU” again.

8.7 CHANGING THE PASSWORD

Select “

CHANGE PASSWORD

” on

“CONFIGURATION MENU”. Write new password with MENU buttons. Every

depression of button will switch to the next digit.

Long press (3 sec) to save the new password and return to “CONFIGURATION MENU” again.

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8.8 MODIFYING THE SERIAL NUMBER

The unit holds a user definable 16 characters serial number. Every character can take values between 0-9 and A-Z. The default value of serial number is “0000000000000000”.

Select “SERIAL NUMBER” on “CONFIGURATION MENU”. Write new serial number with MENU

buttons. Every depression of button will switch to the next character.

Long press (3 sec) to save new serial number and return to “CONFIGURATION MENU” again.

8.9 USER DISPLAY PAGE CONFIGURATION

The unit offers a user-configurable screen (display page 16) through “USER MENU” topic.

There are 2 sizes of characters that can be selected (5x7 and 10x14 pixels).

Select the character size with

and , and

then press to select item menu.

Select an item to display on “SELECT AN ITEM”

menu, then press .

This will return to character type selection menu for the next displayed item.

As long as the screen setting continues, the current status the user display page is constantly displayed.

The display configuration will resume when there is no place to show another item.

The user can terminate anytime by long pressing

(3 sec) the button.

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8.10 CONFIGURING AN ITEM’S LOW OR HIGH LIMIT

Select “

REFERENCE CNFG

” on

“CONFIGURATION MENU”. Select low limit (minimum acceptable value) or high limit (maximum acceptable value) of the item to

configure then press .

Then select the item to configure on the list and

press again.

After selection of the item, the limit value should be entered. Especially for power or user counters, large values may be needed. Thus the user must select the multiplier first (‘x1’,’x100’ or ‘x1000’).

For example; ‘x10’ means “multiply set value by 10”. Then the user will enter a smaller value.

The format of the value is “000000.0” and can be between 0.0 and 999999.9

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After entering the limit value of the item, the action to be taken when the condition occurs has to be selected.

LOCK means that, once the condition occurs, it will persist until manually reset by the user.

Otherwise the condition will reset automatically when the event causing the condition goes off.

The user can select between actions to be taken when the condition occurs.

”VISUAL WARNING” means there is no output function, but a message is displayed on the screen.

The unit has 2 internal relays and each one has four input registers referred as “VALUE-1”, “VALUE-2”, “VALUE-3”, and “VALUE-4”.

The condition may be directed to any relay’s VALUE registers.

VALUE registers will be used in relay configuration.

The “RELAY CONFIGURATION” chapter will describe in detail the use of VALUE registers.

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2.11 INPUT CONFIGURATION

The unit has two configurable inputs.

Level transitions from high to low (NC=normally closed contact) and low to high (NO=normally open contact) may be programmed independently.

There are various functions that can be assigned for each input. Some of these actions can be clearing a counter, selecting between counters, clearing fault conditions, assigning the input to relay input registers.

• Clear Counter: Sets the selected counter to zero.

• Increment Counter: Increments the selected counter by 1.

• Select Counter: The unit has 2 sets of active and reactive power counters additionally to 4 user counters.

Active/Reactive 1 counters are default selections and incremented with consumed power. As there may be more than one power source (like gensets) and these sources supply power on different occasions, the user may want to measure consumed powers from different sources with separate counters. If an input is assigned as “SELECT COUNTER”, “kW/kVAr 1&2”, then the unit will increment the first counter set when there is no signal at the input, and it will increment the second set when the signal is present. In the same way, user counters can be switched with input signal.

• Clear Alarm: Resets selected alarm.

• Clear All Alarms: Resets all alarms.

• Relay Value: Write input status to relay

VALUE register.

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2.12 RELAY CONFIGURATION

The unit has 2 relay outputs with configurable functions.

Relays can be configured as kW or kVAr tick outputs, sending 1 pulse per kW (or kVAr).

Each relay has 4 input value registers. Relays can operate depending on a logical function of their input value registers.

There are several available logical functions:

• Relay = VALUE 1: The relay output will follow the VALUE 1 register. When the value is TRUE then the relay contact will close.

• Relay = NOT VALUE 1: The relay output will be the opposite of the VALUE 1 register. When the value is FALSE then the relay contact will close.

• Relay = VALUE 1 OR VALUE 2: If at least one of value registers is TRUE then the relay contact will close. Otherwise it will open.

• Relay=VALUE 1 AND VALUE 2: If both value registers are TRUE then the relay contact will close. Otherwise it will open.

•

Relay = VALUE 1 NOR VALUE 2: If at

least one of value registers is TRUE then the relay contact will open. Otherwise it will close.

• Relay = VALUE 1 NAND VALUE 2: If

both value registers are TRUE then the relay contact will open. Otherwise it will close.

• Relay = V1 OR V2 OR V3 OR V4: If at

least one of value registers is TRUE then the relay contact will close. Otherwise it will open.

• Relay = V1 NOR V2 NOR V3 NOR V4: If

at least one of value registers is TRUE then the relay contact will open. Otherwise it will close.

• Relay = VALUE 1 OR (NOT VALUE 2):

If VALUE 1 is true or VALUE 2 is false then the relay contact will close. Otherwise it will open.

• Relay = VALUE 1 AND (NOT VALUE

2): If VALUE 1 is true and VALUE 2 is

false then the relay contact will close. Otherwise it will open.

• Relay = VALUE 1 NOR (NOT VALUE

2): If VALUE 1 is true or VALUE 2 is

false then the relay contact will open. Otherwise it will close.

• Relay = VALUE 1 NAND (NOT VALUE

2): If VALUE 1 is true and VALUE 2 is

false then the relay contact will open. Otherwise it will close.

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A “delay before response can be set for relays. The screen below will be displayed after first two steps. Set the required delay time here.

2.13 RESETTING A COUNTER

The unit offers 2 sets of active and reactive power counters together with 4 user counters. Counters can be reset via the configuration menu whenever required.

Select “CLEAR COUNTERS” on “CONFIGURATION MENU”. From the list select the counter required to be reset.

A confirmation screen will appear. Selecting “YES” option on this screen will reset the counter and return to “CONFIGURATION MENU”.

Counter value cannot be restored.

2.14 RESETTING DEMAND VALUES

The unit always stores the maximum values of both current inputs (I1-I2-I3) and the total active power (∑P). These values are visualized on Display page 10.

The user can reset these values and restart the monitoring via “DEMAND RESET” menu.

Select “DEMAND RESET” on “CONFIGURATION

MENU”. Then select “YES” and press to reset demand values and return to the “CONFIGURATION MENU” .

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2.15 OVERCURRENT DETECTOR CONFIGURATION

The “OVERCURRENT” function is used in order to generate a protection relay output when any of the phase currents exceeds the preset value for “TIMEOUT” duration.

The response time depends on the overcurrent rate as shown on below graph.

OVERCURRENT AREA

PERMITTED AREA

A: Over current value T: Timeout value

The fastest detection time is 500 milliseconds.

The overcurrent function will be assigned to a relay output.

When overcurrent function is assigned to a relay, then other configurations for that relay is discarded.

4A

3A

2A

A

T/2 T T/4 T/8

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2.16 PHASE SEQUENCE FAILURE

The unit checks continuously the sequence of AC phase voltages.

If voltages are in the correct sequence, below symbol appears on voltage display pages, namely pages 2 and 3.

If voltages are in wrong order, the symbol disappears.

The effect of phase sequence failure is configurable. It can be:

• assigned to a relay’s value register

• a visual warning

• nothing (no effect).

Select “PHASE SEQUENCE” on “CONFIGURATION MENU”. Select action to take

then press .

Note that PHASE SEQUENCE FAILURE may be combined with other conditions using VALUE registers. (see section RELAY CONFIGURATION)

2.17 RESETTING LOW/HIGH LIMITS

It is possible to clear every items low and high limit configurations.

For this select “RESET ALL REFS” on “CONFIGURATION MENU”. Select “YES” and

then press to clear all reference configurations and return to “CONFIGURATION MENU”.

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2.18 RETURN TO FACTORY SETTINGS

It is possible to reset the unit to factory settings, before starting a new configuration process.

For this select “RETURN FACTORY” on “CONFIGURATION MENU”.

Then select “YES” and press to reset the unit to factory configuration and return to “CONFIGURATION MENU”.

2.19 CALIBRATION

Calibration can be modified only with a special password.

The unit is factory calibrated but it is possible to recalibrate it in order to obtain equal display values on different measuring instruments.

Select “CALIBRATION ” on “CONFIGURATION

MENU”. Then select channel with and ,

and then press .

Then adjust the coefficient until required measured value is displayed on the bottom right of the screen

then press to save the new calibration coefficient and return “CONFIGURATION MENU”.

CHANNEL

MEASUREMENT

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9. MODBUS COMMUNICATIONS

9.1 DESCRIPTION

The unit offers serial data communication port allowing it to be integrated in automation systems.

The serial port is of RS-485 MODBUS-RTU standard. It is fully isolated from power supply and measurement terminals for failure-free operation under harsh industrial conditions.

The MODBUS properties of the unit are:

-Data transfer mode: RTU

-Serial data: 9600 bps, 8 bit data, no parity, 1 bit stop

-Supported functions:

-Function 3 (Read multiple registers)

-Function 6 (Write single register)

-The answer to an incoming message is sent with a minimum of 4.3ms delay after message reception.

Each register consists of 2 bytes (16 bits). Larger data structure contain multiple registers.

Detailed description about the MODBUS protocol is found in the document “Modicon Modbus Protocol Reference Guide”. This document may be downloaded at:

www.modbus.org/docs/PI_MBUS_300.pdf

Data Reading

The function 03 (read multiple registers) will be used for data reading. The MODBUS master will send a query. The answer will be one of the below:

-A response containing the requested data

-An exceptional response indicating a read error.

The maximum number of registers read in one message is 123. If more registers are requested, the unit will send only the first 123 registers.

The query message specifies the starting register and quantity of registers to be read. The message structure is below:

Byte

Description

Value

0 Controller address 1 to 253 1 Function code 3 2 Starting address high See below the description of available

registers

3 Starting address low 4 Number of registers high always 0 5 Number of registers low max 7Bh (123 decimal) 6 CRC low byte See below for the checksum calculation 7 CRC high byte

Here is the sequence to read 16 registers starting from address 20h (32 decimal): 01 03 00 20 00 10 45 CC (each byte is expressed as 2 hexadecimal characters)

The checksum value in the above message may be used for the verification of checksum calculation algorithm.

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The normal response will be:

Byte

Description

Value

0 Controller address same as in the query 1 Function code 3 2 Data lenght in

bytes

(L) number of registers * 2 3 High byte of 1st register 4 Low byte of 1st register 5 High byte of 2nd register 6 Low byte of 2nd register

....

L+1 High byte of the last register L+2 Low byte of the last register L+3 CRC low byte See below for the checksum calculation L+4 CRC high byte

The exceptional response will be:

Byte

Description

Value

0 Controller address same as in the query 1 Function code 131 (function code + 128) 2 Exception code 2 (illegal address) 3 CRC low byte See below for the checksum calculation 4 CRC high byte

Data Writing

The function 06 (write single register) is used for data writing. Only one register can be written at a time.

The MODBUS master will send a query containing data to be written. The answer will be one of the below:

-A normal response confirming successful write,

-An exceptional response indicating a write error.

Only some of the available registers are authorized to be written. An attempt to write a write protected register will result to the exceptional response.

The query message specifies the register address and data. The message structure is below:

Byte

Description

Value

0 Controller address 1 to 253 1 Function code 6 2 Register address high See below the description of available registers 3 Register address low 4 Data high byte 5 Data low byte 6 CRC low byte See below for the checksum calculation 7 CRC high byte

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Here is the sequence to write the value 0010h to the register 40h (64 decimal): 01 06 00 40 00 10 89 D2 (each byte is expressed as 2 hexadecimal characters)

The checksum value in the above message may be used for the verification of checksum calculation algorithm

The normal response will be the same as the query:

Byte

Description

Value

0 Controller address 1 to 253 1 Function code 6 2 Register address high See below the description of available registers 3 Register address low 4 Data high byte 5 Data low byte 6 CRC low byte See below for the checksum calculation 7 CRC high byte

The exceptional response will be:

Byte

Description

Value

0 Controller address same as in the query 1 Function code 134 (function code + 128) 2 Exception code 2 (illegal address)

or

10 (write protection) 3 CRC low byte See below for the checksum calculation 4 CRC high byte

CRC calculation

Here is a procedure for generating a CRC:

1) Load a 16–bit register with FFFF hex (all 1’s). Call this the CRC register.

2) Exclusive OR the first 8–bit byte of the message (the function code byte) with the low– order byte of the 16–bit CRC register, putting the result in the CRC register.

3) Shift the CRC register one bit to the right (toward the LSB), zero–filling the MSB. Extract and examine the LSB. The LSB is the least significant bit of the CRC before the shift operation.

4) If the LSB is 1: Exclusive OR the CRC register with the polynomial value A001 hex.

5) Repeat Steps 3 and 4 until 8 shifts have been performed. Thus, a complete 8–bit byte will be processed.

6) Repeat Steps 2 through 5 for the next 8–bit byte of the message. Continue doing this until all bytes have been processed.

7) The final contents of the CRC register is the CRC value.

8) Place the CRC into the message such that the low byte is transmitted first. The algorithm should give the correct CRC for below messages:

01 03 00 20 00 10 45 CC 01 06 00 40 00 10 89 D2

J38D01 - 30 -

Error codes

Only 3 error codes are used: 01: illegal function code 02: illegal address 10: write protection (attempt to write a read_only register)

Data types

Each register consists of 16 bits (2 bytes)

If the data type is a byte, only the low byte will contain valid data. High byte is don’t care.

For data type longer than 16 bits, consecutive registers are used. The least significant register comes first.

Register definitions

Write single register is only used for changing channel to calculate harmonics. Thus only register 1 is writable.

9.2 MODBUS REGISTERS

ADDRE

SS

NAME DESCRIPTION LENGTH R/W TYPE X

40001 Channel Channel for harmonic calculation 16 BIT R/W unsigned word 1

40002 1. Harmonic 1. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40003 3. Harmonic 3. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40004 5. Harmonic 5. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40005 7. Harmonic 7. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40006 9. Harmonic 9. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40007 11. Harmonic 11. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40008 13. Harmonic 13. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40009 15. Harmonic 15. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40010 17. Harmonic 17. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40011 19. Harmonic 19. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40012 21. Harmonic 21. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40013 23. Harmonic 23. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40014 25. Harmonic 25. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40015 27. Harmonic 27. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40016 29. Harmonic 29. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40017 31. Harmonic 31. harmonic of selected channel (%) 16 BIT R-O unsigned word 0.01

40018 Warnings [1] Warnings Register 1 (See Warnings) 16 BIT R-O unsigned word 1

40019 Warnings [2] Warnings Register 1 (See Warnings) 16 BIT R-O unsigned word 1

40020 Warnings [3] Warnings Register 1 (See Warnings) 16 BIT R-O unsigned word 1

40021 Warnings [4] Warnings Register 1 (See Warnings) 16 BIT R-O unsigned word 1

40022 Warnings [5] Warnings Register 1 (See Warnings) 16 BIT R-O unsigned word 1

J38D01 - 31 -

ADDRE

SS

NAME DESCRIPTION LENGTH R/W TYPE X

40023

V1 RMS

V1 phase to neutral voltage AC RMS value

32 BIT R-O unsigned long 0.1

40024

40025

V2 RMS

V2 phase to neutral voltage AC RMS value

32 BIT R-O unsigned long 0.1

40026

40027

V3 RMS

V3 phase to neutral voltage AC RMS value

32 BIT R-O unsigned long 0.1

40028

40029

I1 RMS I1 current AC RMS value 32 BIT R-O unsigned long 0.1

40030

40031

I2 RMS I2 current AC RMS value 32 BIT R-O unsigned long 0.1

40032

40033

I3 RMS I3 current AC RMS value 32 BIT R-O unsigned long 0.1

40034

40035

V12 RMS

U12 phase to phase voltage AC RMS value

32 BIT R-O unsigned long 0.1

40036

40037

V23 RMS

U23 phase to phase voltage AC RMS value

32 BIT R-O unsigned long 0.1

40038

40039

V31 RMS

U31 phase to phase voltage AC RMS value

32 BIT R-O unsigned long 0.1

40040

40041

S1 Apparent Power

Phase 1 apparent power (kVA) 32 BIT R-O unsigned long 0.1

40042

40043

S2 Apparent Power

Phase 2 apparent power (kVA) 32 BIT R-O unsigned long 0.1

40044

40045

S3 Apparent Power

Phase 3 apparent power (kVA) 32 BIT R-O unsigned long 0.1

40046

40047

∑S Apparent Power

Total apparent power (kVA) 32 BIT R-O unsigned long 0.1

40048

40049

P1 Active Power

Phase 1 active power (kW) 32 BIT R-O signed long 0.1

40050

40051

Q1 Reactive Power

Phase 1 reactive power (kW) 32 BIT R-O signed long 0.1

40052

40053

P2 Active Power

Phase 2 active power (kW) 32 BIT R-O signed long 0.1

40054

40055

Q2 Reactive Power

Phase 2 reactive power (kW) 32 BIT R-O signed long 0.1

40056

40057

P3 Active Power

Phase 3 active power (kW) 32 BIT R-O signed long 0.1

40058

40059

Q3 Reactive Power

Phase 3 reactive power (kW) 32 BIT R-O signed long 0.1

J38D01 - 32 -

ADDRE

SS

NAME DESCRIPTION LENGTH R/W TYPE X

40060

40061

∑P Active Power

Total active power (kW) 32 BIT R-O signed long 0.1

40062

40063

∑Q Reactive Power

Total reactive power (kW) 32 BIT R-O signed long 0.1

40064

40065 Cosф 1 Phase 1 power factor 16 BIT R-O signed word

0.00 1

40066 Cosф 2 Phase 2 power factor 16 BIT R-O signed word

0.00 1

40067 Cosф 3 Phase 3 power factor 16 BIT R-O signed word

0.00 1

40068 ∑Cosф Total power factor 16 BIT R-O signed word

0.00 1

40069 Frequency Frequency 16 BIT R-O unsigned word 0.01

40070

kW Counter 1 Active power counter 1 32 BIT R-O unsigned long 0.1

40071

40072

kVAr Counter 1

Reactive power counter 1 32 BIT R-O unsigned long 0.1

40073

40074

kW Counter 2 Active power counter 2 32 BIT R-O unsigned long 0.1

40075

40076

kVAr Counter 2

Reactive power counter 2 32 BIT R-O unsigned long 0.1

40077

40078

User Counter 1

User Counter 1 32 BIT R-O unsigned long 1

40079

40080

User Counter 2

User Counter 2 32 BIT R-O unsigned long 1

40081

40082

User Counter 3

User Counter 3 32 BIT R-O unsigned long 1

40083

40084

User Counter 4

User Counter 4 32 BIT R-O unsigned long 1

40085

40086 THD

Total harmonic distortion of the selected channel

16 BIT R-O signed word 0.01

40087

I1 MAX

Phase L1, max current in a month’s period.

32 BIT R-O unsigned long 0.1

40088

40089

I2 MAX

Phase L1, max current in a month’s period.

32 BIT R-O unsigned long 0.1

40090

40091

I3 MAX

Phase L1, max current in a month’s period.

32 BIT R-O unsigned long 0.1

40092

40093

P MAX Max active power in a month’s period. 32 BIT R-O unsigned long 0.1

40094

J38D01 - 33 -

9.3 WARNING REGISTERS

MODBUS warnings register section contains 5 x 16 bit registers, 80 bits in total.

First 40 bits indicate values below set limit, last 40 bits indicate values above set limits.

ADDRESS

REG.

BIT

TOTAL

BIT

DESCRIPTION

40018

0 0 V1 RMS value below the set value

1 1 V2 RMS value below the set value

2 2 V3 RMS value below the set value

3 3 I1 RMS value below the set value

4 4 I2 RMS value below the set value

5 5 I3 RMS value below the set value

6 6 U12 RMS value below the set value

7 7 U23 RMS value below the set value

8 8 U31 RMS value below the set value

9 9 Phase 1 active power below the set value

10 10 Phase 2 active power below the set value

11 11 Phase 3 active power below the set value

12 12 Phase 1 reactive power below the set value

13 13 Phase 2 reactive power below the set value

14 14 Phase 3 reactive power below the set value

15 15 Phase 1 apparent power below the set value

ADDRESS

REG.

BIT

TOTAL

BIT

DESCRIPTION

40019

0 16 Phase 2 apparent power below the set value

1 17 Phase 3 apparent power below the set value

2 18 Total active power below the set value

3 19 Total reactive power below the set value

4 20 Total apparent power below the set value

5 21 Phase 1 power factor below the set value

6 22 Phase 2 power factor below the set value

7 23 Phase 3 power factor below the set value

8 24 Total power factor below the set value

9 25 Frequency below the set value

10 26 Active power counter 1 below the set value

11 27 Reactive power counter 1 below the set value

12 28 Active power counter 2 below the set value

13 29 Reactive power counter 2 below the set value

14 30 User counter 1 below the set value

15 31 User counter 2 below the set value

J38D01 - 34 -

ADDRESS

REG.

BIT

TOTAL

BIT

DESCRIPTION

40020

0 32 User counter 3 below the set value

1 33 User counter 4 below the set value

2 34 Reserved

3 35 Reserved

4 36 Reserved

5 37 Reserved

6 38 Reserved

7 39 Reserved

8 40 V1 RMS value above the set value

9 41 V2 RMS value above the set value

10 42 V3 RMS value above the set value

11 43 I1 RMS value above the set value

12 44 I2 RMS value above the set value

13 45 I3 RMS value above the set value

14 46 U12 RMS value above the set value

15 47 U23 RMS value above the set value

ADDRESS

REG.

BIT

TOTAL

BIT

DESCRIPTION

40021

0 48 U31 RMS value above the set value

1 49 Phase 1 active power above the set value

2 50 Phase 2 active power above the set value

3 51 Phase 3 active power above the set value

4 52 Phase 1 reactive power above the set value

5 53 Phase 2 reactive power above the set value

6 54 Phase 3 reactive power above the set value

7 55 Phase 1 apparent power above the set value

8 56 Phase 2 apparent power above the set value

9 57 Phase 3 apparent power above the set value

10 58 Total active power above the set value

11 59 Total reactive power above the set value

12 60 Total apparent power above the set value

13 61 Phase 1 power factor above the set value

14 62 Phase 2 power factor above the set value

15 63 Phase 3 power factor above the set value

J38D01 - 35 -

ADDRESS

REG.

BIT

TOTAL

BIT

DESCRIPTION

40022

0 64

Total power factor above the set value

1 65 Frequency above the set value

2 66 Active power counter 1 above the set value

3 67 Reactive power counter 1 above the set value

4 68 Active power counter 2 above the set value

5 69 Reactive power counter 2 above the set value

6 70 User counter 1 above the set value

7 71 User counter 2 above the set value

8 72 User counter 3 above the set value

9 73 User counter 4 above the set value

10 74 Reserved

11 75 Reserved

12 76 Reserved

13 77 Reserved

14 78 Reserved

15 79 Reserved

J38D01 - 36 -

10. TECHNICAL SPECIFICATIONS

Power Supply Input: 170 - 275VAC, 50 - 60Hz nominal (± 10%)

Different AC supply voltages available.

Measurement Input Range:

Voltage inputs: 10 - 300 V AC (L-N)

20 - 520 V AC (L-L)

Current inputs: 0.2 – 5.5 A AC Frequency: 30 - 100 Hz

Accuracy:

Voltage: 0.5%+1digit Current: 0.5%+1 digit Frequency: 0.5%+1 digit Power(kW,kVAr): 1.0%+2digit Power factor: 2.0%+2digit

Measurement Range: CT range: 5/5A to 5000/5A

VT range: 1.0/1 to 5000.0/1

kW range: 1.0 kW to 50.0 MW Power Consumption: < 4 VA Voltage burden: < 0.1VA per phase Current burden: < 1VA per phase Relay Outputs: 5A @ 250VAC Digital Inputs:

Active level: 5 to 30V-DC or AC Min pulse duration: 250ms. Isolation: 1000V AC, 1 minute Serial Port: Signal level: RS-485 Communication: Modbus RTU Data Rate: 9600 bauds, no parity, 1 bit stop. Isolation: 500V AC, 1minute

Serial port cable: 2 wires twisted, shielded cable. Max 60pF/meter Operating Temperature: -20°C to +70°C (-4 to +158 °F). Maximum humidity: 95% non-condensing. Degree of Protection: IP 54 (Front Panel) , IP 30 (Back panel) Enclosure: Non-flammable, ROHS compliant, ABS/PC (UL94-V0) Installation: Flush mounting with rear retaining brackets

Dimensions: 102x102x53mm (WxHxD) Panel Cutout: 92x92mm Weight: 350 gr

EU Directives Conformity:

2006/95/EC (low voltage) 2004/108/EC (EMC)

Norms of reference:

EN 61010 (safety requirements) EN 61326 (EMC requirements)

PACKAGING INFORMATION

Pieces per Package: 12 pieces Package Size: 280 x 170 x 215mm (LxWxH) Package Weight: 4.4 kg