Datakom DKM-250 User Manual

DKM-250 User Manual V-2.0

DKM-250 DC ENERGY ANALYZER

DESCRIPTION

The DKM-250 is a precision instrument designed for measuring, displaying and remote monitoring earth leakage and various DC parameters in a DC distribution box.

The unit features a 32-bit ARM core microcontroller.

The unit is supplied from the measuring DC voltage input. Operating range is between 19 and 150VDC.

The current input of the unit is isolated from the rest of the circuit and has different circuit options:

● External current shunt (standard)

● Internal current shunt

● Hall Effect sensor input

● 4-20mA analog input

The unit has 2 digital inputs and 2 relay outputs, both of them programmable for required functions.

FEATURES

● Displays earth leakage in %

● Various current input options

● 2 programmable relay outputs

● 2 programmable digital inputs

● Programmable 4-20mA analog output

● Demand, Min & Max records

● Fully isolated RS-485 serial port

● MODBUS-RTU communications

● Bidirectional current & power measurement

● Bidirectional kW-h energy counter

● Bidirectional A-h counter

● Hours run counter

● Front panel programming

● Wide operating temperature range

Thanks to its isolated RS-485 Modbus RTU comport, the device is free from ground potential difference issues and data are safely transferred to automation and monitoring systems. Program parameters may be uploaded to the unit through the RS485 port.

The unit may output any measured value as analog signal through its 4-20mA port. This output allows easy connection to PLC systems.

● Sealed front panel (IP65 with gasket)

● Two part connection system

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DKM-250 User Manual V-2.0

Electrical equipment should be installed only by qualified

Check the unit for cracks and damages due to transportation.

Fuses must be connected to the power supply and voltage

Fuses must be of fast type

with a maximum rating of 6A.

Disconnect all power before working on equipment.

When the unit is connected to the networ

k do not touch

Any electrical parameter applied to the device must be in the

Verify correct terminal connections before applying power.

Only for

front

panel mounting.

SAFETY NOTICE Failure to follow below instructions will result in death or serious injury



specialist. No responsibility is assured by the manufacturer or any of its subsidiaries for any consequences resulting from the non-compliance to these instructions.



Do not install damaged equipment.

 Do not open the unit. There are no serviceable parts inside.



inputs, in close proximity of the unit.



terminals.



range specified in the user manual. Although the unit is designed with a wide safety margin, over-range parameters may reduce lifetime, alter operational precision or even damage the unit.



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



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DKM-250 User Manual V-2.0

TABLE OF CONTENTS

Section

1. INSTALLATION INSTRUCTIONS

1.1 FRONT AND BACK PANELS

1.2 ELECTRICAL INSTALLATION

1.3 INSTALLATION DIAGRAM

2. PUSHBUTTON FUNCTIONS

3. SCREEN NAVIGATION

4. PROGRAMMING

4.1 ENTERING THE PROGRAMMING MODE

4.2 RESETTING DEMANDS

4.3 RESETTING ENERGY COUNTERS

4.4 RESETTING Ah (ampere*hour) COUNTERS

4.5 RESETTING RUN HOURS

4.6 RESETTING ALARMS

4.7 ADJUSTING CURRENT MEASUREMENT INPUT

4.8 ADJUSTING CURRENT HIGH LIMIT

4.9 ADJUSTING VOLTAGE LOW AND HIGH LIMITS

4.10 SELECTING VOLTAGE MEASUREMENT INPUT

4.11 ADJUSTING LOW AND HIGH POWER LIMITS

4.12 ADJUSTING THE DEMAND PERIOD

4.13 ADJUSTING THE 4-20mA ANALOG OUTPUT

4.14 SELECTING THE DEFAULT SCREEN

4.15 ALARM CONFIGURATION

4.16 MODBUS PARAMETERS

4.17 ADJUSTING LOW AND HIGH EARTH LEAKAGE LIMITS

4.18 PROGRAMMABLE RELAY SETUP

4.19 PROGRAMMABLE DIGITAL INPUT SETUP

4.20 OUTPUT PULSE (kWh, Ah, hour) SETUP

4.21 DISPLAYING THE FIRMWARE VERSION

4.22 CALIBRATION

4.23 LAMP TEST

5. MODBUS COMMUNICATIONS

5.1. DESCRIPTION

5.2. COMMANDS

5.3. PROGRAM PARAMETERS

5.4. MEASUREMENTS AND CONTROLLER RECORDS

6. TECHNICAL SPECIFICATIONS

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DKM-250 User Manual V-2.0

1. INSTALLATION INSTRUCTIONS

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 damage the enclosure.

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

 Be sure that adequate cooling is provided.

 Be sure that the temperature of the environment will not exceed the maximum operating temperature in any

case.

 Be sure that the unit is not subject to water spill.

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.

 Voltage applied to digital inputs over specified range.

 Overloading or short-circuiting relay outputs

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

 High voltage applied to communication ports.

 Excessive vibration, direct installation on vibrating parts.

Current Shunt must be used for current measurement.

No direct connection allowed

.

Below conditions may cause abnormal operation:

 Power supply voltage below minimum acceptable level.

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1.1 FRONT AND BACK PANELS

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1.2 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 voltage inputs, in close proximity

of the unit.

 Fuses must be of fast type with a maximum rating of 6A.

 Use cables of appropriate temperature range.

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

 Follow national rules for electrical installation.

Current Shunt must be used for current measurement.

No direct connection allowed

.

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1.3 INSTALLATION DIAGRAM

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2. PUSHBUTTON FUNCTIONS

3 front panel buttons allow navigation between measurement and programming screens.

BUTTON

FUNCTION

If more than one active alarm exists, then display next

alarm.

HELD PRESSED FOR 2 SECONDS:

Resets Min-Max values and alarms and displays the minimum values.

PROGRAMMING: Save adjusted parameter and switch to the next parameter. If long-pressed then switch to previous parameter.

Switch to the upper screen.

PROGRAMMING: increase value

Switch to the lower screen.

PROGRAMMING: decrease value

HELD PRESSED TOGETHER FOR 2 SECONDS:

Selects programming mode. If held pressed in programming mode, then returns to normal mode.

NO KEY PRESSED DURING 1 MINUTE:

Returns to the selected main display screen.

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3. SCREEN NAVIGATION

Buttons allow navigation between measurement values. The yellow led related to the currently displayed values will turn on. As an exception, if the total run hours is displayed, “Ah” and “kWh” leds will turn on.

In the occurrence of an alarm the red ALARM led turns on and the alarm is displayed on the screen.

If positive or negative earth leakage occurs, both LEAK and ALARM leds will turn on.

If Ah and kWh leds are off, the upper screen shows the voltage (in volts), the mid-screen shows the current (in amperes) and the lower screen shows the power (in kilowatts).

When no yellow led is on and the upper screen displays “EARH” and the middle screen displays “LEAK”, then the lower display will show the earth leakage in percent (%).

If no led is on then these are instantaneous measured values. The “MIN” led denotes minimum values, the “MAX” led denotes maximum values, the “DEM” led denotes demand values. If MAX and DEM leds are both on, the display shows maximum demand values.

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Display of measured current: If the measured current value is below 100A, then it is

displayed with 0.01A precision. Between 100A and 1000A it is displayed with 0.1A precision. Between 1000A and 10000A it is displayed with 1A precision. When read from Modbus, the current will have 0.01A precision.

Display of measured voltage: If the measured voltage value is below 100V then it is displayed with 0.01V precision. If the voltage is between 100V and 1000V it is displayed with 0.1V precision. Between 1000V and 10000V the voltage is displayed with 1 V precision. When read from Modbus, the voltage will have 0.01V precision.

Display of measured power: If the measured power is below 10kW then it is displayed with 0.001kW precision. Between 10kW and 100kW it is displayed with 0.01kW precision. Between 100kW and 1000kW it is displayed with 0.1kW precision. Between 1000kW and 10000kW it is displayed with 1kW precision. When read from Modbus, the power will have

0.001kW precision.

Display of earth leakage:

The measured earth leakage is displayed with 1% precision from both Modbus and the screen.

kWh counters display: kWh (energy) counters are always read (from both Modbus and screen) with 0.1kWh precision.

Ah counters display: Ah counters are always read (from both Modbus and screen) with

0.1Ah precision.

Total run hours display: Total run hours counters are always read (from both Modbus and screen) with 0.1hour precision.

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Alarm display: When an alarm occurs, then the ALARM led will turn on and the display will

show the alarm information every 2 seconds. If multiple alarms are present, other alarms may be displayed by pressing the SET pushbutton.

Alarm 1 : High Voltage Alarm

Alarm 2 : Low Voltage Alarm

Alarm 3 : Excess Current Alarm

Alarm 4 : Excess Power (kW) Alarm

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Alarm 5 : Low Power (kW) Alarm

Alarm 6 : Positive (+) earth leakage alarm

Alarm 7 : Negative (-) earth leakage alarm

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the unit

sed for 2 seconds, then

4. PROGRAMMING

4.1 ENTERING THE PROGRAMMING MODE

In order to offer the maximum flexibility to the customer, the module has several programmable parameters.

 Device configurations



Default screen configuration

 Measurement configurations



Demand reset



Counter reset



Alarm reset

 Current shunt configuration  Alarm high/low limit adjustments  Input/Output Configurations



Alarm configuration



Modbus Codbus configuration

 Unit Calibration

In order to enable the programming menu, hold both MENU buttons pressed for 2 seconds.

In order to exit programming menu, hold both MENU buttons pressed for 2 seconds.

If no button is pressed during 1 minute, then will automatically close the programming mode.

Parameter values are modified with UP and DOWN Menu buttons. If the button is held pressed, the the value will change with larger steps.

When SET button is pressed, the value on the screen is recorded and the next parameter is displayed.

If the SET button is held pres the previous parameter is displayed.

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4.2 RESETTING DEMANDS

Parameter value

0: No operation 1: Reset demand counters

Setting this parameter to 1 causes demand and max_demand values to be reset.

The parameter value is not saved and always reads 0.

4.3 RESETTING ENERGY COUNTERS

Parameter value

0: No operation 1: Reset kWh counters

Setting this parameter to 1 causes both positive and negative energy counters (kWh) values to be reset.

The parameter value is not saved and always reads 0.

4.4 RESETTING Ah (ampere*hour) COUNTERS

Parameter value

0: No operation 1: Reset Ah counters

Setting this parameter to 1 causes both positive and negative ampere*hour counters (Ah) values to be reset.

The parameter value is not saved and always reads 0.

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4.5 RESETTING RUN HOURS

Parameter value

0: No operation 1: Reset hour counter

Setting this parameter to 1 causes the run hour counter to be reset.

The parameter value is not saved and always reads 0.

4.6 RESETTING ALARMS

Parameter value

0: No operation 1: Reset alarms

Setting this parameter to 1 causes alarms to be reset.

The parameter value is not saved and always reads 0.

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4.7 ADJUSTING CURRENT MEASUREMENT INPUT

This parameter adjusts the rated value of the current shunt in amperes.

The factory set value is 40.0A

Adjustement range is between 0.1 and 3200amperes

This parameter adjusts the rated voltage of the current shunt in volts.

The factory set value is 0.060V

Adjustement range is between 0.001 and 0.100volts.

4.8 ADJUSTING CURRENT HIGH LIMIT

This parameter adjusts the overcurrent limit.

Positive and negative currents are monitored for their absolute value and the alarm occurs for any direction of the current.

If this parameter is adjusted to 3200 (DISB ,DISB) then the overcurrent limit is not monitored and the overcurrent alarm does not occur.

Factory set value is 3200A

Adjustment range is between 0.1A and 3200A

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4.9 ADJUSTING VOLTAGE LOW AND HIGH LIMITS

This parameter adjusts the upper limit of the high voltage alarm.

If this parameter is set to 400.0 (DISB ,DISB) then high voltage is not monitored and no alarm occurs.

Factory set value is 400.0V

Adjustment range is between 0.1 and 400.0V

This parameter adjusts the lower limit of the low voltage alarm.

If this parameter is set to 0.0 (DISB ,DISB) then low voltage is not monitored and no alarm occurs.

Factory set value is 0.0V

Adjustment range is between 0.0 and 300.0V

4.10 SELECTING VOLTAGE MEASUREMENT INPUT

This parameter selects the voltage threshold where the voltage measurement switches from the sensitive range normal range.

Factory set value is 70.0V.

Adjustment range is between 0.00V and 70.00V.

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4.11 ADJUSTING LOW AND HIGH POWER LIMITS

This parameter adjusts the upper limit of the high power alarm. Positive and negative powers are monitored for their absolute value and the alarm occurs for any direction of the power flow.

If this parameter is set to 0.0 then high power is not monitored and no alarm occurs.

Factory set value is 0.0kW

Adjustment range is between 0.0 and 3200.0kW

This parameter adjusts the lower limit of the low power alarm. Positive and negative powers are monitored for their absolute value and the alarm occurs for any direction of the power flow.

If this parameter is set to 0.0 then high power is not monitored and no alarm occurs.

Factory set value is 0.0kW

Adjustment range is between 0.0 and 3200.0kW

4.12 ADJUSTING THE DEMAND PERIOD

This parameter determines the demand period for voltage, current and power measurements. The average value is calculated during the demand period and at the end of the period new demand values overwrite older values.

Factory set value is 15 minutes.

Adjustment range is 1 to 240 minutes.

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4.13 ADJUSTING THE 4-20mA ANALOG OUTPUT

This parameter determines the analog value to be output from the 420mA analog output.

Factory set value is 0.

Adjustment range is 0 to 22.

Parameter value

10 Maximum current demand (negative direction)

11 Maximum power demand (positive direction)

Measurement at output

0 Instantaneous voltage (V)

1 Instantaneous current (A)

2 Instantaneous power (kW)

3 Current demand (absolute value)

4 Current demand (positive direction)

5 Current demand (negative direction)

6 Power demand (positive direction)

7 Power demand (negative direction)

8 Maximum Voltage Demand

9 Maximum current demand (positive direction)

12 Maximum power demand (negative direction)

13 Maximum Voltage

14 Minimum Voltage

15 Maximum current (positive direction)

16 Minimum current (positive direction)

17 Maximum power (positive direction)

18 Minimum power (positive direction)

19 Maximum current (negative direction)

20 Minimum current (negative direction)

21 Maximum power (negative direction)

22 Minimum power (negative direction)

23 Earth leakage percent (%)

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This parameter defines the value corresponding to 4mA current output. (low limit)

Factory set value is 0.

Adjustment range is between -999.9 and 3000.0

This parameter defines the value corresponding to 20mA current output. (high limit)

Factory set value is 100.0.

Adjustment range is between -999.9 and 3200.0

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4.14 SELECTING THE DEFAULT SCREEN

This parameter selects the screen menu where the unit returns when no pushbutton is pressed during 5 minutes.

It also determines the screen that comes when the programming mode is closed.

Factory set value is 0.

Adjustment range is 0 to 13.

Parameter

Display menu

valuei

0 Instantaneous measurements

1 Earth leakage percent (%)

2 Ah counter (positive direction)

3 Ah counter (negative direction)

4 kWh counter (positive direction)

5 kWh counter (negative direction)

6 Total run hour counter

7 Minimum values (positive direction)

8 Minimum values (negative direction)

9 Maximum values (positive direction)

10 Maximum values (negative direction)

11 Demand values (positive direction)

12 Demand values (negative direction)

13 Max demand values (positive direction)

14 Max demand values (negative direction)

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4.15 ALARM CONFIGURATION

This parameter determines the delay between an alarm condition occurs and the alarm given.

Factory set value is 0.

Adjustment range is 0 to 255 seconds.

0: Alarm lock disabled

1: Alarm lock enabled

When this parameter is set to 1, even if the alarm cause is removed, alarms will persist until manually reset.

When this parameter is set to 0, when the alarm cause is removed, alarms automatically disappear.

Factory set value is 0.

Adjustment range is 0 to 1.

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4.16 MODBUS PARAMETERS

This parameter determines the Modbus node address of the unit. Every unit in the same Modbus loop must have a different node address.

Factory set value is 1.

Adjustment range is 0 to 245.

This parameter determines the data rate (baud rate) used in the Modbus communication. Every unit in the same Modbus loop must use the same data rate.

0: Baud rate = 2400

1: Baud rate = 4800

2: Baud rate = 9600

3: Baud rate = 19200

4: Baud rate = 38400

Factory set value is 2.

Adjustment range is 0 to 4.

If this parameter is set to a value different from 0, then the unit will require this parameter as a password prior to Modbus writes or Modbus commands.

If the parameter is set to 0 then no password is required.

Factory set value is 0.

Adjustment range is 0 to 9999.

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4.17 ADJUSTING LOW AND HIGH EARTH LEAKAGE LIMITS

This parameter adjusts the upper limit of the ratio of the earth voltage to supply voltage.

The factory set value is 70%.

Adjustment range is 0 to 100%

This parameter adjusts the lower limit of the ratio of the earth voltage to supply voltage.

The factory set value is 30%.

Adjustment range is 0 to 100%

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4.18 PROGRAMMABLE RELAY SETUP

This is the wait delay between the conditions that will activate the relay occur and the relay is activated.

The factory set value is 0.

Adjustment range is 0 to 255 seconds.

This parameter selects the RELAY_1 function.

The factory set value is 12.

Adjustment range is 0 to 17

This parameter selects the RELAY_2 function.

The factory set value is 13.

Adjustment range is 0 to 17

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Value

Relay function

Relay function is selected from below list:

0 1 High voltage alarm 2 Low voltage alarm 3 High current alarm 4 High power (kW) alarm 5 Low power (kW) alarm 6 Positive (+) earth leakage alarm 7 Negative (+) earth leakage alarm 8 Active if any alarm occurs

9 Low or high voltage alarm 10 Low or high power (kW) alarm 11 Positive (+) or negative (-) earth

leakage alarm 12 Follows the digital input_1 13 Follows the digital input_2 14 kWh, Ah or hour pulse 15 If the value 1234 is written to

Modbus address 35 then the

function is active 16 If the value 1234 is written to

Modbus address 36 then the

function is active 17 -

This parameter determines the RELAY_1 contact type.

0: Normally open (NO)

1: Normally closed (NC)

The factory set value is 0.

Adjustment range is 0 to 1.

This parameter determines the RELAY_2 contact type.

0: Normally open (NO)

1: Normally closed (NC)

The factory set value is 0.

Adjustment range is 0 to 1.

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4.19 PROGRAMMABLE DIGITAL INPUT SETUP

This parameter determines the wait delay between the digital input signal and the activation of input function.

The factory set value is 0.

Adjustment range is 0 to 80 seconds.

This parameter selects the function performed when the digital input_1 signal is active.

The factory set value is 0.

Adjustment range is 0 to 11.

This parameter selects the function performed when the digital input_2 signal is active.

The factory set value is 0.

Adjustment range is 0 to 11.

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Value

Function when signal is active

Function when signal is passive

Digital input functions are selected from below list:

0 - 1 kWh and Ah counters operate kWh and Ah counters are stopped 2 When signal is activated, kWh and Ah

counters are reset, then they start

kWh and Ah counters are stopped

counting

3 kWh, Ah and hours-run counters

operate

4 When signal is activated, kWh, Ah and

hours-run counters are reset, then

kWh, Ah and hours-run counters are stopped kWh, Ah and hours-run counters are stopped

they start counting 5 hours-run counter operates hours-run counter is stopped 6 When signal is activated, the hours-

hours-run counter is stopped run counter is reset, then it starts counting

7 When signal is activated, kWh and Ah

-

counters are reset

8 When signal is activated, The hours-

-

run counter is reset

9 When signal is activated, kWh and Ah

-

counters are reset

10 Alarms are reset 11 When signal is active, displays turn off Displays operate normally

This parameter selects when the input function is activated for the digital input_1.

0: active when signal present

1: active when signal is absent

The signal is applied to digital inputs with the polarity shown in the installation diagram.

The factory set value is 0.

This parameter selects when the input function is activated for the digital input_2.

0: active when signal present

1: active when signal is absent

The signal is applied to digital inputs with the polarity shown in the installation diagram.

The factory set value is 0.

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4.20 OUTPUT PULSE (kWh, Ah, hour) SETUP

If any of relay functions (explained in chapter 4.17) is set to 14 (kWh, Ah or hour-run pulse), then below parameters will determine the pulse charateristics.

This parameter defines the counter increment step to provide 1 pulse.

The factory set value is 1.000 kWh or Ah or hour.

Adjustement range is 0.001 to 10.000

This parameter defines the active pulse duration in seconds.

The factory set value is 0.20 second (200 ms).

Adjustment range is 0.10 to 9.99 seconds.

WARNING: Excessive pulse duration may cause a missing pulse.

This parameter defines the minimum duration between 2 pulses.

The factory set value is 0.20 second (200 ms).

Adjustment range is 0.10 to 9.99 seconds.

WARNING: Excessive duration may cause a missing pulse.

This parameter determines the counter providing pulses.

0: Positive direction kWh counter

1: Negative direction kWh counter

2: Positive direction Ah counter

3: Negative direction Ah counter

4: Total hours-run counter

The factory set value is 0.

Adjustment range is 0 to 4 seconds.

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4.21 DISPLAYING THE FIRMWARE VERSION

The firmware version is displayed in te second line of the “end

end , End”

end end

screen.

Any inquiry to the manufacturer must state the firmware version in question.

4.22 CALIBRATION

The unit leaves the production in a calibrated status.

If recalibration is required, enter the password “3282” to the third line of the “end

end , End” screen and press the SET button.

end end

The calibration screen about the 110V voltage input will be seen. The first display will show “110V”. The second screen will display the measured instantaneous voltage from the input. The third display will display the calibration coefficient (high 4 digits only)

Adjust UP and DOWN menu buttons until the value displayed in the second screen is correct.

When the value is correct then press SET button. The unit will switch to 60V voltage input calibration.

In 60V input calibration mode, the first display will show “60V”. The second screen will display the measured instantaneous voltage from the input. The third display will display the calibration coefficient (high 4 digits only)

Adjust UP and DOWN menu buttons until the value displayed in the second screen is correct.

When the value is correct then press SET button. The unit will switch to first current input zero point calibration.

WARNING: The supply voltage should not exceed 70VDC.

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In the first current input zero mode, the first display will show “1CRZ”. The second screen will display the measured instantaneous current from the input. The third display will display the offset value causing display 00.00 at no current.

Adjust UP and DOWN menu buttons until the value displayed in the second screen is correct.

When the value is correct then press SET button. The unit will switch to second current input zero point calibration.

In the second current input zero mode, the first display will show “2CRZ”. The second screen will display the measured instantaneous current from the input. The third display will display the offset value causing display 00.00 at no current.

Adjust UP and DOWN menu buttons until the value displayed in the second screen is correct.

When the value is correct then press SET button. The unit will switch to first current input sensitivity calibration.

In the first current input sensitivity calibration mode, the first display will show “1CUR”. The second screen will display the measured instantaneous current from the input. The third display will display the calibration coefficient (high 4 digits only)

Adjust UP and DOWN menu buttons until the value displayed in the second screen is correct.

When the value is correct then press SET button. The unit will switch to second current input sensitivity calibration.

The second current input is internal and makes a more precise measurement in low currents. The switching between two internal inputs is automatic. Between -10mV and +10mV the sensitive input is used. Above this signal amplitude the normal input is active.

In the second current input sensitivity calibration mode, the first display will show “2CUR”. The second screen will display the measured instantaneous current from the input. The third display will display the calibration coefficient (high 4 digits only)

Adjust UP and DOWN menu buttons until the value displayed in the second screen is correct.

When the value is correct then press SET button. The unit will switch to Vin voltage calibration.

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Vin voltage is generated internally and used to check that the internal power supply is operating.

In Vin calibration mode, the first display will show “vIn”. The second screen will display the measured instantaneous Vin voltage. The third display will display the calibration coefficient (high 4 digits only)

Adjust UP and DOWN menu buttons until the value displayed in the second screen is correct. In normal operation Vin should be

17.80volts.

When the value is correct then press SET button. The unit will switch to 4mA calibration of the 4-20mA output.

In 4mA calibration mode, the first display will show “4mA”. The second display is blank. The third display will show the calibration coefficient necessary to send 4mA from the analog output.

Measure the analog output with a precision ampermeter. Adjust UP and DOWN menu buttons until the value displayed in the ampermeter is 4.00mA.

When the value is correct then press SET button. The unit will switch to 20mA calibration of the 4-20mA output.

In 20mA calibration mode, the first display will show “20mA”. The second display is blank. The third display will show the calibration coefficient necessary to send 20mA from the analog output.

Measure the analog output with a precision ampermeter. Adjust UP and DOWN menu buttons until the value displayed in the ampermeter is 20.00mA.

When the value is correct then press SET button.

In earth voltage calibration mode, the first display will show “EarH”. The second display shows the instantaneous voltage measured at the EARTH input. The third display shows the calibration coefficient.

If no earth leakage is present (input open) then half the supply voltage should be measured. Adjust UP and DOWN menu buttons until the value displayed in half the supply voltage.

When the value is correct then press SET button.

As this is the last calibration parameter, the display will switch to the first calibration parameter, which is 110V voltage input calibration.

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4.23 LAMP TEST

When programming is over, hold pressed UP and DOWN MENU buttons for 2 seconds.

The unit will exit program mode and will turn on all lights for lamp testing purpose.

Check that all lights are on.

Press any button to resume normal operation.

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Byte

Description

Value

5. MODBUS COMMUNICATIONS

5.1. 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: 2400-38400 bps, 8 bit data, no parity, 1 bit stop

-Supported functions:

-Function 3 (Read multiple registers)

-Function 6 (Write single register)

-Function 10 (Write multiple 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:

http://www.modbus.org/specs.php

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 120. If more registers are requested, the unit will send only the first 120 registers.

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

0 Controller address 1 to 254 1 Function code 3 2 Starting address high See below the description of available 3 Starting address low 4 Number of registers high always 0 5 Number of registers low max 78h (120 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)

registers

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Byte

Description

Value

bytes

Byte

Description

Value

Byte

Description

Value

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

The normal response will be:

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

(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:

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) or function 10h (write multiple registers) is used for data writing. A maximum of 32 registers 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:

0 Controller address 1 to 254 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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DKM-250 User Manual V-2.0

Byte

Description

Value

Byte

Descrip

tion

Value

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:

0 Controller address 1 to 254 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:

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

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DKM-250 User Manual V-2.0

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.

5.2. COMMANDS

Commands to the unit are written to below addresses.

If the Modbus Write Password parameter (moDB WRIT

moDB WRIT)” is left 0 as in the factory settings,

moDB WRITmoDB WRIT

then the unit will not ask any password for Modbus commands and Modbus writes.

If the Modbus Write Password parameter (moDB WRIT

moDB WRIT)” is set to a value other than 0, then

moDB WRITmoDB WRIT

the unit will require a password for commands and data writes.

If the value recorded as Modbus Write Password parameter (moDB WRIT

moDB WRIT)” or 3271 is written

moDB WRITmoDB WRIT

to the address 7168, then during next 10 minutes, Modbus area can be written and below commands can be executed. All commands (other than the password) may be activated by writing a value other than zero to the related register.

ADRESS NAME

7168 Password Programming password

7169

7170 Reset kWh Reset all kWh counters

7171 Reset Ah

7172 Reset hour Reset run counter

7173 Reset alarm Reset all alarms

7174

7175 Factory set Return to factory settings

7176 Boot mode

Reset demand

Reset MinMax

DESCRIPTION

Reset all demand registers

Reset all Ah counters

Reset all min and max values

The unit switches to the boot mode for firmware download through USB.

LENGTH R/W

16 BIT

16 BIT W-O unsigned word 1

DATA TYPE COEFF

W-O unsigned word

1

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5.3. PROGRAM PARAMETERS

Program parameters of the unit may be read from below registers or program parameters may be set by writing to these registers.

ADRESS NAME

01

02

03

04

05

06

07

08

09

10

11

12

13

14

15

16

17

18

19

20

21 Relay delay (sec) Explained ch 4.18 16 BIT

22 Relay-1 function

23 Relay-1 type

24 Relay-2 function

25 Relay-2 type

26 Digital input delay Explained ch 4.19 16 BIT

27

28 Digital input_1 type Explained ch 4.19 16 BIT

29

30 Digital input_2 type Explained ch 4.19 16 BIT

Shunt max current Explained ch 4.7

Shunt max voltage Explained ch 4.7

Overcurrent limit

Voltage high limit

Voltage low limit Voltage input

selection (60V or 400V)

Power high limit

Power low limit

Demand periode 4-20mA Analog out

function selection Analog out 4mA value Analog out 20mA value

Default screen

Alarm delay

Alarm lock Modbus node

address Modbus baudrate

Modbus password Explained ch 4.16 Earth lekage %

upper limit (%) Earth lekage % lower limit (%)

Digital input_1 function

Digital input_2 function

DESCRIPTION

Explained ch 4.8

Explained ch 4.9

Explained ch 4.10

Explained ch 4.11

Explained ch 4.12

Explained ch 4.13

Explained ch 4.14

Explained ch 4.15

Explained ch 4.16

Explained ch 4.17 16 BIT

Explained ch 4.18

Explained ch 4.19 16 BIT

DIMENS R/W

16 BIT

R/W

DATA TYPE

signed word

unsigned word

unsigned word unsigned word

unsigned word

COEFF

0.1

0.001

0.1

1

0.1

1

0.1

1

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DKM-250 User Manual V-2.0

ADRESS NAME

31

32 Pulse duration (sec) Explained ch 4.20 16 BIT

33

34

35

36

Counter increment for 1 pulse

Min delay between pulses Counter selection for pulses

Relay_1 control through Modbus

Relay_2 control through Modbus

DESCRIPTION

Explained ch 4.20 16 BIT

Explained in chapter

4.18 as relay function 15. If a value of 1234 is written to this address then the relay will be active. Explained in chapter

4.18 as relay function 15. If a value of 1234 is written to this address then the relay will be active.

DIMENS R/W

R/W

R/W unsigned word 0.01

R/W unsigned word 1

16 BIT

R/W unsigned word 1

DATA TYPE

unsigned word

COEFF

0.001

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DKM-250 User Manual V-2.0

5.4. MEASUREMENTS AND CONTROLLER RECORDS

ADRESS NAME

8192

8194

8196

8198 Vin voltage

8200 Current (A)

8202 Power (kW)

8204 Voltage demand

8206 Positive current demand 32 BIT R-O unsigned long 0.01

8208 Negative current demand 32 BIT R-O signed long

8210 Positive power demand 32 BIT R-O unsigned long 0.001

8212 Negative power demand 32 BIT R-O signed long 0.001

8214 Max demand voltage

8216

8218

8220

8222

8224 Max voltage

8226 Min voltage

8228 Max current positive

8230 Min current positive

8232 Max power positive

8234 Min power positive

8236 Max current negative

8238 Min current negative

8240 Max power negative

8242 Min power negative

8244

8246

Voltage measured from 110V input Voltage measured from 60V input Voltage measured from selected input

Max demand current positive Max demand current negative Max demand power positive Max demand power negative

Current measured from input-1 (normal scale, large currents) Current measured from input-2 (sensitive scale, small currents)

DESCRIPTION

32 BIT R-O unsigned long 0.01

32 BIT R-O signed long

32 BIT R-O signed long 0.001

32 BIT R-O unsigned long 0.01

DIMENS R/W DATA TYPE COEFF

32 BIT R-O unsigned long 0.01

32 BIT R-O signed long

32 BIT R-O unsigned long 0.001

32 BIT R-O signed long 0.001

32 BIT R-O unsigned long 0.01

32 BIT R-O unsigned long 0.001

32 BIT R-O signed long

32 BIT R-O signed long 0.001

32 BIT R-O signed long

0.01

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BIT

ADRESS NAME

8248

8240

8252 reserved 32 BIT R-O unsigned long 0.01

8254

8256

8258

8260

8262 Total run hour counter 32 BIT R-O unsigned long 0.1

8264 Alarms

8265 reserved

8266 Unit model

8267 Unit firmware version 16 BIT R-O

Alarm status record is 16 bit long. Each bit indicates the existence of one alarm.

NO:

DESCRIPTION

0

-

1

High voltage (Alarm 1)

2

Low voltage (Alarm 2)

3

Overcurrent (Alarm 3)

4

Excess power (kW) (Alarm 4)

5

Low power (kW) (Alarm 5)

6

Positive (+) Earth Leakage (Alarm 6)

7

Nega tive (-) Earth Leakage (Alarm 7)

8

-

9

-

10 -

11 -

12 -

13 -

14 -

15 -

Earth leakage voltage (V)

Earth leakage percent (%)

Energy counter (kWh), positive direction Energy counter (kWh), negative direction Ah (amperes*hour) counter, positive direction Ah (amperes*hour) counter, negative direction

DESCRIPTION

32 BIT R-O unsigned long 0.01

32 BIT R-O unsigned long 0.1

Alarm durum kaydı

16 BIT R-O

DIMENS R/W DATA TYPE COEFF

16 BIT R-O

unsigned

word

unsigned

word

unsigned

word

unsigned

word

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DKM-250 User Manual V-2.0

6. TECHNICAL SPECIFICATIONS

Supply Input: 19-150VDC Power Consumption: < 4W Voltage Measurements Inputs:

0-70V Input Sensitivity: 0.02V 70-150V Input Sensitivity: 0.40V

Current Measurement Input: Measurement range: -100 to +100mV. Accuracy: % 0.2 Isolation: 1000V AC, 1 minute Internal Current Shunt Option: Measurement range: 0-15A Analog Output: 0-20mA Analog Output Precision: 16 bit Digital Input Range: 19 to 150VDC Relay Outputs: 5 Amps @ 28VDC Serial Port:

Signal type: RS-485 Protocol: Modbus RTU Data Rate: 2400-38400baud Isolation: 1000V AC, 1 minute

Operating Temp. Range: -20°C...+70 °C (-4°F...158°F) Max. Relative Humidity: %95 non-condensing Protection Degree: IP 65 (Front panel, w. gasket)

IP 30 (Back panel) Enclosure: Flame retardent, ROHS compliant high temperature ABS/PC (UL94-V0) Installation: Flush mounting with rear brackets Dimensions: 102x102x53mm (WxHxD) Panel Cutout: 92x92mm Weight: 200 gr

EU Directives:

2014/35/EC (LVD) 2014/30/EC (EMC)

Tel: +90-216-466 84 60 Fax: +90-216-364 65 65 e-mail: [email protected] http: www.datakom.com.tr

Reference Standards: EN 61010 (safety) EN 61326 (EMC)

DATAKOM Elektronik Ltd.

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