Eastron SDM630-Modbus V2 DIN Rail Smart Meter User Manual

Introduction

The SDM630-Modbus V2 measures and displays the characteristics of single-phase two-wire (1p2w), three-phase three-wire (3p3w), and three-phase four-wire (3p4w) electrical supplies. It measures voltage, frequency, current, power, active and reactive energy, both imported and exported. Maximum demand current can be measured over preset periods of up to 60 minutes. The unit requires voltage and current inputs in addition to the supply required to power it.

The SDM630-Modbus V2 supports a maximum of 100A direct connection, which saves cost and avoids the trouble of connecting external Current Transformers (CTs), offering cost-effective and easy operation. Built-in interfaces provide pulse and RS485 Modbus RTU outputs. Configuration is password protected.

Unit Characteristics

The unit can measure and display:

• Line voltage and THD% (total harmonic distortion) of all phases.
• Line Frequency.
• Currents, Current demands, and current THD% of all phases.
• Power, maximum power demand, and power factor.
• Active energy imported and exported.
• Reactive energy imported and exported.

The unit has password-protected set-up screens for:

• Changing password.
• Supply system selection (1p2w, 3p3w, 3p4w).
• Demand Interval Time (DIT).
• Reset for demand measurements.
• Pulse output duration.

Two pulse outputs indicate real-time energy measurement. An RS485 output allows remote monitoring from another display or a computer.

RS485 Serial - Modbus RTU

This uses an RS485 serial port with Modbus RTU protocol to provide a means of remotely monitoring and controlling the unit. Set-up screens are provided for configuring the RS485 port.

Pulse Output

This provides two pulse outputs that clock up measured active and reactive energy. Pulse output 2 for active energy is fixed at 400imp/kWh with a fixed width of 100ms. Configurable pulse output 1 can be set from the set-up menu, with a default constant of 400imp/kWh and pulse width of 100ms.

Start-up Screens

The meter displays information sequentially upon startup:

1. Screen 1: Lights up all display segments for a display check. Shows values like T-8.8.8.8 (MkWh), Σ-8.8.8.8 (MkVArh), -8.8:8.8 (MKVA), and indicators for VI%THD, Hz, PF, C1, C2.
2. Screen 2: Displays the firmware version (e.g., SOFE 1.302) and build number (e.g., 2014).
3. Screen 3: Performs a self-test, indicating "PASS" if successful.

After a short delay, the screen displays active energy measurements.

Measurements

The meter's buttons operate as follows:

• [U/I ESC]: Selects Voltage and Current display screens. In Set-up Mode, acts as "Left" or "Back".
• [M Up]: Selects Frequency and Power factor display screens. In Set-up Mode, acts as "Up".
• [P Down]: Selects Power display screens. In Set-up Mode, acts as "Down".
• [E Enter/Right]: Selects Energy display screens. In Set-up Mode, acts as "Enter" or "Right".

Each successive press of the [U/I ESC] button selects a new voltage and current range.

Voltage and Current Displays

• 1-1 (3p4w): Phase to neutral voltages (L1, L2, L3) shown in Volts (V).
• 1-2 (3p3w): Phase-to-phase voltages (L1-2, L2-3, L3-1) shown in Volts (V).
• 2: Current on each phase (L1, L2, L3) shown in Amperes (A).
• 3-1 (3p4w): Phase to neutral voltage THD% for each phase (L1, L2, L3) shown in V%THD.
• 3-2 (3p3w): Phase-to-phase voltage THD% for each pair (L1-2, L2-3, L3-1) shown in V%THD.
• 4: Current THD% for each phase (L1, L2, L3) shown in %THD.

Frequency and Power Factor Displays

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

• 1: Frequency and Power Factor (total) shown as ≥ 00.00 Hz and 0.999 PF.
• 2: Power Factor of each phase (L1, L2, L3) shown as 0.999 PF.

Demand Displays

• 3: Maximum Power Demand (MD) shown in kW.
• 4: Maximum Current Demand (MD) shown in Amperes (A) for each phase (L1, L2, L3).

Power Displays

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

• 1: Instantaneous Active Power in kW for each phase (L1, L2, L3).
• 2: Instantaneous Reactive Power in kVAr for each phase (L1, L2, L3).
• 3: Instantaneous Volt-amps in kVA for each phase (L1, L2, L3).
• 4: Total kW, kVArh, kVA displayed.

Energy Measurements Displays

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

• 1-1 (IMPORT): Imported active energy in kWh.
• 1-2 (EXPORT): Exported active energy in kWh.
• 2-1 (IMPORT): Imported reactive energy in kVArh.
• 2-2 (EXPORT): Exported reactive energy in kVArh.
• 3-1: Total active energy in kWh.
• 3-2: Total reactive energy in kVArh.

Set-up

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

The display shows "PASS" followed by "0000". Setting up is password-protected; enter the correct password (default '1000') before proceeding. An incorrect password entry will display "Err".

To exit set-up mode, press [U/I ESC] repeatedly until the measurement screen is restored.

Set-up Entry Methods

Some menu items require a four-digit number entry (e.g., password), while others require selection from menu options (e.g., supply system).

1. Use the [M Up] and [P Down] buttons to select the required item from the menu. Selection does not roll over between the bottom and top of the list.
2. Press [E] to confirm your selection.
3. If an item flashes, it can be adjusted using the [M Up] and [P Down] buttons.
4. After selecting an option, press [E] to confirm. The SET indicator will appear.
5. After completing a parameter setting, press [U/I ESC] to return to a higher menu level. The SET indicator will be removed, allowing further menu selection using [M Up] and [P Down].
6. On completion of all set-up, press [U/I ESC] repeatedly until the measurement screen is restored.

Number Entry Procedure

When entering numbers (e.g., password), digits are set individually from left to right.

1. The current digit to be set flashes and is adjusted using the [M Up] and [P Down] buttons.
2. Press [E] to confirm each digit setting. The SET indicator appears after the last digit has been set.
3. After setting the last digit, press [U/I ESC] to exit the number setting routine. The SET indicator will be removed.

Change Password

Follow the procedure to change the password. Use [M Up] and [P Down] to choose the "Change password" option, then [E] to enter the routine. The new password screen appears with the first digit flashing. Use [M Up] and [P Down] to set the first digit, then [E] to confirm. Repeat for the remaining three digits. After setting the last digit, "SET" will show.

DIT Demand Integration Time

This sets the period in minutes for integrating current and power readings for maximum demand measurement. Options: 0, 5, 8, 10, 15, 20, 30, 60 minutes. Use [M Up] and [P Down] from the set-up menu to select the DIT option. Press [E] to enter the selection routine. The current time interval will flash. Use [M Up] and [P Down] to select the required time, then [E] to confirm. The SET indicator will appear. Press [U/I ESC] to exit.

Backlit Set-up

The backlit lasting time is settable. Default is 60 minutes. Options: 0 (always on), 5, 10, 30, 60, 120 minutes. Use [M Up] and [P Down] to select the time, then [E] to confirm.

Supply System

Set the type of power supply being monitored. From the Set-up menu, use [M Up] and [P Down] to select the System option. Press [E] to enter the selection routine. The current selection will flash. Use [M Up] and [P Down] to select the required system option: 1P2W, 3P3W, 3P4W. Press [E] to confirm. The SET indicator will appear. Press [U/I ESC] to exit.

Pulse Output

Configure Pulse Output 1 to provide pulses for a defined amount of energy (active or reactive). Use this section to set up the pulse output for Total kWh/Total kVArh, Import kWh/Export kWh, or Import kVArh/Export kVArh. From the Set-up menu, use [M Up] and [P Down] to select the Pulse output option. Press [E] to enter the selection routine. The unit symbol will flash. Use [M Up] and [P Down] to choose kWh or kVArh. Press [E] to confirm and [U/I ESC] to return to the main set-up menu.

Pulse Rate

Set the energy represented by each pulse. Rate can be set to 1 pulse per dFt (2.5 Wh/VArh), 0.01 (10 Wh/VArh), 0.1 (100 Wh/VArh), 1 (1 kWh/kVArh), 10 (10 kWh/kVArh), 100 (100 kWh/kVArh). Use [M Up] and [P Down] to select the Pulse Rate option. Press [E] to enter the selection routine. The current setting will flash. Use [M Up] and [P Down] to choose the pulse rate. Press [E] to confirm and [U/I ESC] to return to the main set-up menu.

Pulse Duration

The pulse width can be selected as 200ms, 100ms (default), or 60ms. Use [M Up] and [P Down] to select the Pulse width option. Press [E] to enter the selection routine. The current setting will flash. Use [M Up] and [P Down] to choose pulse width. Press [E] to confirm and [U/I ESC] to return to the main set-up menu.

RS485 Communication

For Modbus RTU, configure parameters from the Set-up menu:

• Baud Rate: 2400, 4800, 9600, 19200, 38400. Use [M Up] and [P Down] to select the Baud Rate option. Press [E] to enter the selection routine. Use [M Up] and [P Down] to choose the rate. Press [E] to confirm.
• Parity: None (default), Odd, Even. Use [M Up] and [P Down] to select the Parity option. Press [E] to enter the selection routine. Use [M Up] and [P Down] to choose Parity. Press [E] to confirm.
• Stop Bits: 1 or 2. Note: Default is 1, and can only be changed to 2 if Parity is NONE. Use [M Up] and [P Down] to select the Stop Bit option. Press [E] to enter the selection routine. Use [M Up] and [P Down] to choose Stop Bit (2 or 1). Press [E] to confirm.
• RS485 Network Address: 3-digit number, 001 to 247. Use [M Up] and [P Down] to select the Address ID. Press [E] to enter the selection routine. Use [M Up] and [P Down] to choose the address. Press [E] to confirm.
• Modbus™ Word Order: Hi/Lo byte order is set automatically to normal or reverse and cannot be configured from the set-up menu.

Reset

The meter provides a function to reset the maximum demand value of current and power. From the Set-up menu, use [M Up] and [P Down] to select the reset option. Press [E] to enter the selection routine. The MD will flash. Press [E] to confirm the setting and [U/I ESC] to return to the main set-up menu.

Specifications

Measured Parameters

• 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). Basic current (Ib): 10A. Max current: 100A. Min. Current: 5% of Ib. Starting current: 0.4% of Ib. 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.
• Power Factor and Frequency and Max. Demand: Frequency in Hz. Instantaneous power: Power 0 to 99999 W, Reactive Power 0 to 99999 VAr, Volt-amps 0 to 99999 VA. Maximum demanded power since last Demand reset. Power factor. Maximum neutral demand current, since the last Demand reset (for 3p4w supply only).
• Energy Measurements: Imported active energy: 0 to 999999.99 kWh. Exported active energy: 0 to 999999.99 kWh. Imported reactive energy: 0 to 999999.99 kVArh. Exported reactive energy: 0 to 999999.99 kVArh. Total active energy: 0 to 999999.99 kWh. Total reactive energy: 0 to 999999.99 kVArh.

Measured Inputs

Voltage inputs through a 4-way fixed connector with 25mm² stranded wire capacity. Supports single phase two wire (1p2w), three phase three wire (3p3w), or four phase four wire (3p4w) unbalanced configurations. Line frequency is measured from L1 voltage or L3 voltage.

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): ±2% of range maximum
• Apparent power (VA): ±1% of range maximum
• Active energy (Wh): Class 1 IEC 62053-21
• Reactive energy (VARh): ±2% of range maximum
• Total harmonic distortion: 1% up to 19st harmonic
• Temperature co-efficient: Voltage and current = 0.013%/°C typical; Active energy = 0.018%/°C, typical.
• Response time to step input: 1s, typical, to >99% of final reading, at 50 Hz.

Interfaces for External Monitoring

Three interfaces are provided:

• An RS485 communication channel programmable for Modbus RTU protocol.
• Pulse output 1 indicating real-time measured energy (configurable).
• Pulse output 2 fixed at 400imp/kWh.

Modbus configuration (Baud rate etc.) and pulse output assignments are configured through the Set-up screens.

Reference Conditions of Influence Quantities

Accuracy is verified under nominal conditions:

• Ambient temperature: 23°C ±2°C
• Input frequency: 50Hz ±2%
• Input waveform: Sinusoidal (distortion factor < 0.005)
• Magnetic field of external origin: Terrestrial flux

Environment

• Operating temperature: -25°C to +55°C
• Storage temperature: -40°C to +70°C
• Relative humidity: 0 to 90%, non-condensing
• Altitude: Up to 2000m
• Warm up time: 10s
• Vibration: 10Hz to 50Hz, IEC 60068-2-6, 2g

Dimensions

The meter has a width of 72mm, height of 100mm, and depth of 45mm. The DIN rail mounting width is 35mm.

Wiring Diagrams

Diagrams illustrate the terminal connections for different system types:

Three Phase Three Wires

Terminals 1-4 are for line inputs (L1, L3, L2). Terminals 5-8 are for outputs or other connections.

Three Phase Four Wires

Terminals 1-4 are for line inputs (L1, L2, L3, N). Terminals 5-8 are for outputs or other connections.

Single Phase Two Wires

Terminals 1-4 are for line inputs (L1, N). Terminals 5-8 are for outputs or other connections.