DIN RAIL SMART METER FOR SINGLE AND THREE PHASE ELECTRICAL SYSTEMS

1. Introduction

This document provides operating, maintenance, and installation instructions. This unit measures and displays the characteristics of single-phase two-wire (1p2w), three-phase three-wire (3p3w), and three-phase four-wire (3p4w) networks. The measuring parameters include voltage (V), frequency (Hz), current (A), power (kW/Kva/Kvar), import, export, and total Energy (kWh/kvArh). The unit can also measure Maximum Demand current and power, measured over preset periods of up to 60 minutes.

This unit is a 1A or 5A current transformer operated and can be configured to work with a wide range of CTs. It features built-in pulse and Modbus or M-Bus outputs. Configuration is password-protected.

This unit can be powered from a separate auxiliary (AC or DC) supply. Alternatively, it can be powered from the monitored supply by linking the voltage reference and neutral reference into terminals 5 and 6 (refer to wiring diagram).

Diagram: A DIN rail mounted smart meter for single and three-phase electrical systems.

1.1 Unit Characteristics

The Unit can measure and display:

• Voltage and THD% (total harmonic distortion) of all phases
• Line frequency
• Currents, current demand, and current THD% of all phases
• Power, maximum power demand, and power factor
• Active energy imported and exported
• Reactive energy imported and exported

1.2 Current Transformer Primary Current

SDM630MCT V2 Series is CT operated. You will need to set the correct ratio. As an example: If using a 100/5A CT, you will need to ensure CT2 (Secondary) is set to 5 and CT rate is 0020. You divide the primary by the secondary to get the CT rate to be entered (100/5=20).

1.3 RS485 Modbus RTU / M-Bus

SDM630MCT V2 and SDM630MCT-2T V2 meters have an RS485 port with Modbus RTU protocol. SDM630MCT-MbusV2 and SDM630MCT-2T-Mbus have an M-Bus port complying with EN13757-3. RS485 or M-Bus provide a means of remotely monitoring and controlling the unit. Setup screens are provided for configuring the communication port.

1.4 Pulse Output

Two pulse outputs pulse measured active and reactive energy. The Pulse 2 constant for active energy is 3200imp/kWh (Terminals 11 & 12). The pulse width for Pulse 1 can be set from the setup menu (Terminals 9 & 10).

Models in this Series:

• SDM630MCT V2: Multi-parameter measurement, Single Tariff, 1A/5A CT operated, RS485 Port Modbus RTU, Bi-directional energy.
• SDM630MCT-Mbus V2: Multi-parameter measurement, Single Tariff, 1A/5A CT operated, M-Bus Communication, Bi-directional energy.
• SDM630MCT-2T V2: Multi-parameter measurement, Double Tariff, 1A/5A CT operated, RS485 Port Modbus RTU, Bi-directional energy.
• SDM630MCT-2T-Mbus: Multi-parameter measurement, Double Tariff, 1A/5A CT operated, M-Bus Communication, Bi-directional energy.

2. Start Up Screens

The first screen lights up all display segments and can be used as a display check.

Software version information is displayed.

The interface performs a self-test and indicates the result if the test passes.

*After a short delay, the screen will display active energy measurements.

3. Measurements

The buttons operate as follows:

• [Left/Back]: Selects the Voltage and Current display screens. In Set-up Mode, this is the “Left” or “Back” button.
• [Up]: Selects the Frequency and Power factor display screens. In Set-up Mode, this is the “Up” button.
• [Down]: Selects the Power display screens. In Set up Mode, this is the “Down” button.
• [Enter/Right]: Selects the Energy display screens. In Set up mode, this is the “Enter” or “Right” button.

3.1 Voltage and Current

Each successive press of the [Left/Back] button selects a new parameter:

• Phase to neutral voltages.
• Current on each phase.
• Phase to neutral voltage THD%.
• Current THD% for each phase.

3.2 Frequency and Power Factor and Demand

Each successive press of the [Up] button selects a new parameter:

• Frequency and Power Factor (total).
• Power Factor of each phase.
• Maximum Power Demand.
• Maximum Current Demand.

3.3 Power

Each successive press of the [Down] button selects a new parameter:

• Instantaneous Active Power in kW.
• Instantaneous Reactive Power in kVAr.
• Instantaneous Volt-Amps in KVA.
• Total kW, kVArh, kVA.

3.4 Energy Measurements

Each successive press of the [Enter/Right] button selects a new parameter:

• Import active energy in kWh.
• Export active energy in kWh.
• Import reactive energy in kVArh.
• Export reactive energy in kVArh.
• Total active energy in kWh.
• Total reactive energy in kVArh.

For SDM630MCT-2T and SDM630MCT-2T-Mbus only:

• T1 active energy in kWh
• T2 active energy in kWh
• T1 reactive energy in kVArh
• T2 reactive energy in kVArh

4. Set Up

To enter set-up mode, press the [Enter/Right] button for 3 seconds until the password screen appears.

Setting up is password-protected, so you must enter the correct password (default ‘1000’) before processing.

If an incorrect password is entered, the display will show: [PASS Err]

To exit setting-up mode, press the [Left/Back] button repeatedly until the measurement screen is restored.

4.1 Set-up Entry Methods

Some menu items, such as password and CT, require a four-digit number entry, while others, such as supply system, require selection from a number of menu options.

4.1.1 Menu Option Selection

1. Use the [Left/Back] and [Up]/[Down] buttons to scroll through the different options of the set up menu.
2. Press [Enter/Right] to confirm your selection.
3. If an item flashes, then it can be adjusted by the [Up]/[Down] buttons.
4. Having selected an option from the current layer, press [Enter/Right] to confirm your selection. The [SET] indicator will appear.
5. Having completed a parameter setting, press [Left/Back] to return to a higher menu level. The [SET] indicator will be removed, and you will be able to use the [Up]/[Down] buttons for further menu selection.
6. On completion of all setting-up, press [Left/Back] repeatedly until the measurement screen is restored.

4.1.2 Number Entry Procedure

When setting up the unit, some screens require the entering of a number. In particular, on entry to the setting up section, a password must be entered. Digits are set individually, from left to right. The procedure is as follows:

1. The current digit to be set flashes and is set using the [Up]/[Down] buttons.
2. Press [Enter/Right] to confirm each digit setting. The [SET] indicator appears after the last digit has been set.
3. After setting the last digit, press [Left/Back] to exit the number setting routine. The [SET] indicator will be removed.

4.2 Change Password

Use the [Left/Back] and [Up]/[Down] buttons to choose the change password option.

Press the [Enter/Right] button to enter the change password routine.

The new password screen will appear with the first digit flashing.

Use [Up]/[Down] buttons to set the first digit and press [Enter/Right] to confirm your selection. The next digit will flash.

Repeat the procedure for the remaining three digits.

After setting the last digit, [SET] will show.

Press [Left/Back] to exit the number setting routine and return to the Set-up menu. [SET] will be removed.

4.3 DIT Demand Integration Time

This sets the period in minutes over which the current and power readings are integrated for maximum demand measurement. The options are: off, 5, 10, 15, 30, 60 minutes.

From the set-up menu, use the [Left/Back] and [Up]/[Down] buttons to select the DIT option. The screen will show the currently selected integration time.

Press [Enter/Right] to enter the selection routine. The current time interval will flash.

Use [Up]/[Down] buttons to select the time required.

Press [Enter/Right] to confirm the selection. The [SET] indicator will appear.

Press [Left/Back] to exit the DIT selection routine and return to the menu.

4.4 Supply System

The unit has a default setting of 3Phase 4wire (3P4). Use this section to set the type of electrical system.

From the set-up menu, use the [Left/Back] and [Up]/[Down] buttons to select the system option. The screen will show the currently selected power supply.

Press [Enter/Right] to enter the selection routine. The current selection will flash.

Use [Up]/[Down] buttons to select the required system option: 1P2(W), 3P3(W), 3P4(W).

Press [Enter/Right] to confirm the selection. The [SET] indicator will appear.

Press [Left/Back] to exit the system selection routine and return to the menu. [SET] will disappear, and you will be returned to the main set-up Menu.

4.5 CT

The CT option sets the secondary current (CT2 1A or 5A) of the current transformer (CT) that wires to the meter.

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the CT option.

Secondary CT setting: Press [Enter/Right] to enter the CT secondary current selection routine (5A/1A).

Set CT Ratio value: Press [Enter/Right] to enter the CT Ratio setting screen. The range is from 0001 to 2000.

For example, if using a 100/5A current transformer, you will enter 0020, as you need to divide the primary by the secondary to get the ratio (CT rate). *Please note for the MID approved version device, you will only have one opportunity to set the ratio.

4.6 PT

The PT option sets the secondary voltage (PT2 100 to 500V) of the voltage transformer (PT) that may be connected to the meter.

Use [Left/Back] and [Up]/[Down] buttons to select the PT option. The screen will show the voltage PT secondary voltage value. The default value is 400V.

Secondary PT setting: Press [Enter/Right] to enter the PT secondary voltage selection routine. The range is from 100 to 500V.

Set PT ratios value: Press [Enter/Right] to enter the PT ratio screen. The range is from 0001 to 9999. For example, if set the ratio to be 100, it means the primary voltage equals secondary voltage x 100.

4.7 Pulse Output

This option allows you to configure the pulse output. The output can be set to provide a pulse for a defined amount of energy (active or reactive). Use this section to set up the relay pulse output—Units: kWh, kVArh.

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the Pulse output option.

Press [Enter/Right] to enter the selection routine. The unit symbol will flash.

Use [Up]/[Down] buttons to choose kWh or kVArh.

On completion of the entry procedure, press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set up menu.

4.7.1 Pulse rate

Use this to set the energy represented by each pulse. Rate can be set to 1 pulse per 0.01kWh, 0.1kWh, 1kWh, 10kWh, 100kWh.

(It shows 1 impulse = 10kWh/kVArh)

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the Pulse Rate option. Press [Enter/Right] to enter the selection routine. The current setting will flash.

Use [Up]/[Down] buttons to choose pulse rate (0.01/0.1/1/10/100kWh/kVArh per pulse).

On completion of the entry procedure, press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set up menu.

4.7.2 Pulse Duration

The energy monitored can be active or reactive, and the pulse width can be selected as 200, 100, or 60ms.

(It shows pulse width of 200ms)

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the Pulse width option. Press [Enter/Right] to enter the selection routine. The current setting will flash.

Use [Up]/[Down] buttons to choose pulse width.

On completion of the entry procedure, press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set-up menu.

4.8 Communication

There is an RS485 port that can be used for communication using Modbus RTU protocol. For Modbus RTU, parameters are selected from the front panel.

4.8.1 RS485 Address

(The range is from 001 to 247)

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the address ID. Press [Enter/Right] button to enter the selection routine. The current setting will be flashing.

Use [Up]/[Down] buttons to choose Modbus address (001 to 247).

On completion of the entry procedure, press [Enter/Right] button to confirm the setting and press [Left/Back] button to return to the main set-up menu.

4.8.2 M-Bus Address

Primary address: 001 to 250

Use [Left/Back] and [Up]/[Down] buttons to select the address value. Press [Enter/Right] to enter the selection routine. The current setting will flash.

Secondary address: 00 00 00 01 to 99 99 99 99

On completion of the entry procedure, press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set-up menu.

4.8.3 Baud Rate

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the Baud Rate option. Press [Enter/Right] to enter the selection routine. The current setting will flash.

Use [Up]/[Down] buttons to choose Baud rate (2.4k, 4.8k, 9.6k, 19.2k, 38.4k).

On completion of the entry procedure, press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set-up menu.

4.8.4 Parity

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the parity option. Press [Enter/Right] to enter the selection routine. The current setting will flash.

Use [Up]/[Down] buttons to choose parity (EVEN / ODD / NONE (default)).

On completion of the entry procedure, press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set-up menu.

4.8.5 Stop bits

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the stop bit option. Press [Enter/Right] to enter the selection routine. The current setting will flash.

Use [Up]/[Down] buttons to choose stop bit (2 or 1).

Note: Default is 1, and only when the parity is NONE that the stop bit can be changed to 2.

On completion of the entry procedure, press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set-up menu.

4.9 Backlit Set-up

The meter provides a function to set the blue backlit lasting time (0/5/10/30/60/120 minutes). Option 0 means the backlit is always on.

Default: 60. If it’s set as 5, the backlit will be off in 5 minutes.

Use [Up]/[Down] buttons to choose the time.

Press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set-up menu.

4.10 CLR

The meter provides a function to reset the maximum demand value of current and power.

From the set-up menu, use [Left/Back] and [Up]/[Down] buttons to select the reset option. Press [Enter/Right] to enter the selection routine. The DIT (Demand Integration Time) will flash.

Press [Enter/Right] to confirm the setting and press [Left/Back] to return to the main set-up menu.

Warnings

Important Safety Information is contained in the Maintenance section. Familiarize yourself with this information before attempting installation or other procedures. Symbols used in this document:

[!] Risk of Danger: These instructions contain important safety information. Read them before starting installation or servicing of the equipment.

Caution: Risk of Electric Shock

5. Specifications

5.1 Measured Parameters

The unit can monitor and display the following parameters of a single-phase two-wire (1p2w), three-phase three-wire (3p3w), or three-phase four-wire (3p4w) system.

5.1.1 Voltage and Current

• Phase to neutral voltages: 100 to 289V a.c. (not for 3p3w supplies).
• Voltages between phases: 173 to 500V a.c. (3p supplies only).
• Percentage total voltage harmonic distortion (THD%) for each phase to N (not for 3p3w supplies).
• Percentage voltage THD% between phases (three-phase supplies only).
• Current THD% for each phase.

5.1.2 Power factor and Frequency and Max. Demand

• Frequency in Hz.
• Instantaneous power: Power 0 to 3600 MW, Reactive power 0 to 3600 MVAr, Volt-amps 0 to 3600 MVA.
• Maximum demanded power since last Demand reset.
• Power factor.
• Maximum neutral demand current, since the last Demand reset (for three-phase supplies only).

5.1.3 Energy Measurements

• Import/Export active energy: 0 to 9999999.9 kWh.
• Import/Export reactive energy: 0 to 9999999.9 kVArh.
• Total active energy: 0 to 9999999.9 kWh.
• Total reactive energy: 0 to 9999999.9 kVArh.

5.2 Measured Inputs

Voltage inputs through a 4-way fixed connector with 2.5mm² stranded wire capacity for single-phase two-wire (1p2w), three-phase three-wire (3p3w), or three-phase four-wire (3p4w) unbalanced systems. Line frequency measured from L1 voltage or L3 voltage.

Three current inputs (six physical terminals) with 2.5mm² stranded wire capacity for connection of external CTs. Nominal rated input current 5A or 1A a.c. Rms.

5.3 Accuracy

• Voltage: 0.5% of range maximum.
• Current: 0.5% of nominal.
• Frequency: 0.2% of mid-frequency.
• Power factor: 1% of unity (0.01).
• Active power (W): ±1% of range maximum.
• Reactive power (VAr): ±1% of range maximum.
• Apparent power (VA): ±1% of range maximum.
• Active energy (Wh): Class 1 IEC 62053-21.
• Reactive energy (VArh): ±1% of range maximum.
• Total harmonic distortion: 1% up to 31st harmonic.
• Response time to step input: 1s, typical, to >99% of final reading, at 50 Hz.

5.4 Auxiliary Supply

Two-way fixed connector with 2.5mm² stranded wire capacity. 85 to 275V a.c. 50/60Hz ±10% or 120V to 380V d.c. ±20%. Consumption < 10W.

5.5 Interfaces for External Monitoring

Three interfaces are provided:

• RS485/Mbus communication channel that can be programmed via protocol remotely.
• Relay output indicating real-time measured energy (configurable).
• Pulse output (Pulse 2) 3200imp/kWh (not configurable).

The Modbus configuration (baud rate, etc.) and the pulse relay output assignments (kW/kVArh, import/export, etc.) are configured through the set-up screens.

5.5.1 Pulse Output

The pulse output can be set to generate pulses to represent kWh or kVArh.

Rate can be set to generate 1 pulse per:

• 0.01 = 10 Wh/VArh
• 0.1 = 100 Wh/VArh
• 1 = 1 kWh/kVArh
• 10 = 10 kWh/kVArh
• 100 = 100 kWh/kVArh
• 1000 = 1000 kWh/kVArh

Pulse width: 200/100/60 ms. Relay Rating: 240V ac 50mA.

5.5.2 RS485 Output for Modbus RTU

For Modbus RTU, the following RS485 communication parameters can be configured from the set-up menu:

• Baud rate: 2400, 4800, 9600, 19200, 38400.
• Parity: none (default) / odd / even.
• Stop bits: 1 or 2.
• RS485 network address: nnn – 3-digit number, 1 to 247.

Modbus Word order: Hi/Lo byte order is set automatically to normal or reverse. It cannot be configured from the set-up menu.

5.6 Reference Conditions of Influence Quantities

Influence Quantities are variables that affect measurement errors to a minor degree. Accuracy is verified under nominal value (within the specified tolerance) of these conditions.

• Ambient temperature: 23°C ±1°C.
• Input frequency: 50 or 60Hz ±2%.
• Input waveform: Sinusoidal (distortion factor < 0.005).
• Auxiliary supply voltage: Nominal ±1%.
• Auxiliary supply frequency: Nominal ±1%.
• Auxiliary supply waveform (if AC): Sinusoidal (distortion factor < 0.05).
• Magnetic field of external origin: Terrestrial flux.

5.7 Environment

• Operating temperature: -25°C to +55°C*.
• Storage temperature: -40°C to +70°C*.
• Relative humidity: 0 to 95%, non-condensing.
• Altitude: Up to 3000m.
• Warm-up time: 1 minute.
• Vibration: 10Hz to 50Hz, IEC 60068-2-6, 2g.
• Shock: 30g in 3 planes.

*Maximum operating and storage temperatures are in the context of typical daily and seasonal variation.

5.8 Mechanics

• DIN rail dimensions: 72 x 94.5 mm (WxH) per DIN 43880.
• Mounting: DIN rail (DIN 43880).
• Sealing: Ip51 (indoor).
• Material: Self-extinguishing Ul94 V-0.

5.9 Declaration of Conformity (for the MID approved version meter only)

We Zhejiang Eastron Electronic Co.,Ltd. Declare under our sole responsibility as the manufacturer that the poly phase multifunction electrical energy meter “SDM630MCT V2 Series” corresponds to the production model described in the EU type examination certificate and to the requirements of the Directive 2014/32/EU. EU type examination certificate number 0120/SGS0142. Identification number of the NB: 0120.

7. Installation

The wiring diagram of SDM630MCT V2 series has little difference from different models. Please make sure the wiring is correct before turning on the power of the meter.

Current and Voltage Inputs

3 PHASE 4 WIRE: Diagram showing connections for 3 Phase 4 Wire system, including voltage and current inputs to terminals 1-4 and 15-20.

3 PHASE 3 WIRE: Diagram showing connections for 3 Phase 3 Wire system, including voltage and current inputs to terminals 1-4 and 15-20.

1 PHASE 2 WIRE: Diagram showing connections for 1 Phase 2 Wire system, including voltage and current inputs to terminals 1-4 and 15-20.

Definitions of other terminals

SDM630MCT V2: Shows terminals for RS485 (GND, B, A), Auxiliary Supply (L, N), Power Output.

SDM630MCT-2T V2: Shows terminals for RS485 (GND, B, A), Auxiliary Supply (L, N), 2 Tariffs Control (230V AC), Power Output.

SDM630MCT-Mbus V2: Shows terminals for M-Bus, Auxiliary Supply (L, N), Power Output.

SDM630MCT-2T-Mbus: Shows terminals for M-Bus, Auxiliary Supply (L, N), 2 Tariffs Control (230V AC), Power Output.

Manufacturer Information:

Zhejiang Eastron Electronic Co., Ltd.
Building 13, No 1369, Chengnan Rd.
Jiaxing, Zhejiang, CHINA
Tel: 86 573 83698881/83698882
Tel: 86 573 83698883
Email: sales@eastrongroup.com
Web: www.eastron.com.cn