EASTRON SDM54-2T (01) PDF MANUAL

The SDM54 measures and displays characteristics for single-phase two-wire (1p2w) and three-phase four-wire (3p4w) systems. This includes:

• Voltage

• Frequency

• Current

• Power (Active, Reactive, Apparent)

• Power Factor

• Active Energy (kWh) – Imported & Exported

• Reactive Energy (kVArh) – Imported & Exported

• Maximum Demand (Power & Current) over preset periods (up to 60 mins)

It supports up to 100A direct load per phase, is designed for DIN-rail mounting with IP51 front protection, and can optionally feature pulse outputs, RS485 Modbus, or M-Bus ports. Configuration is possible via a password-protected keypad.

The SDM54 Series includes three models with the following key differences:

Model	Measurements	Outputs	Tariff Control
SDM54-M	kWh, kVarh, W, Var, VA, PF, Hz, V, A, Max.dmd. Etc.	2x Pulse outputs; RS485 Modbus	Single tariff
SDM54-MB	kWh, kVarh, W, Var, VA, PF, Hz, V, A, Max.dmd. Etc.	2x Pulse outputs; M-Bus	Single tariff
SDM54–2T	kWh, kVarh, W, Var, VA, PF, Hz, V, A, Max.dmd. Etc.	2x Pulse outputs; RS485 Modbus	Double tariffs

The RS485 serial port, using the Modbus RTU protocol, allows for remote monitoring and control of the energy meter. Setup screens are provided within the meter’s menu to configure the RS485 port settings (Address, Baud rate, Parity, Stop bits). D/LT645 protocol is available as an option upon request.

Available on the SDM54-MB model, the M-Bus port complies with the EN13757-3 protocol and provides a means for remote monitoring and control of the meter. Setup screens are available to configure the M-Bus port settings.

The meter has two passive pulse outputs:

• Pulse Output 2: This output is fixed and clocks measured active energy (kWh). The constant is 400 impulses per kWh (imp/kWh) and the pulse width is fixed at 100ms. It is non-configurable.

• Pulse Output 1: This output is configurable via the setup menu. You can set the energy type it represents (e.g., kWh, kVarh, import/export), the pulse constant (e.g., 400, 100, 10, 1, 0.1, 0.01 imp/unit), and the pulse width (60ms, 100ms, 200ms). The default setting is 400 imp/kWh with a 100ms pulse width, representing Export kWh (Exp-kWh).

The SDM54-2T model features double tariff capability for cost allocation. It uses two dedicated terminals (Terminals 7 & 8) to monitor a voltage input (230V AC nominal, range 80%-120%) from an external device (like a timer or switch). When voltage is detected on these terminals, the energy consumption is recorded in separate Tariff 2 registers (T2). When no voltage is present, energy is recorded in the standard Tariff 1 registers (T1). Total energy is the sum of both tariffs.

Upon powering up, the meter shows a sequence of screens:

1. “Initial testing…” message appears while the meter performs self-checks.

2. The software version is displayed (e.g., “Software Version 41 01.03 CX-0303”).

3. Communication details are shown: Meter Serial Number (Meter SN), Modbus ID (if applicable), and Baud rate.

After this brief sequence, the screen defaults to displaying the active energy measurements.

There are two buttons on the front panel:

• Scroll Button (Cycle icon):

– In normal display mode: Press repeatedly to scroll through the different measured parameters.

– In Set-up mode: Press to change the selected option or value.

– In Set-up mode: Press to exit the current menu level or the entire Set-up mode.

• Enter Button (Arrow icon):

– Press and hold to enter the Set-up mode (requires password).

– In Set-up mode: Press to confirm a selection or enter a sub-menu.

Pressing the scroll button cycles through the following measured parameters (availability may depend on model and configuration):

1. Total / Import / Export Active Energy (kWh)

2. Total / Import / Export Reactive Energy (kVarh)

2-1. Tariff 1 Total / Import / Export Active Energy (kWh) (SDM54-2T only)

2-2. Tariff 1 Total / Import / Export Reactive Energy (kVarh) (SDM54-2T only)

2-3. Tariff 2 Total / Import / Export Active Energy (kWh) (SDM54-2T only)

2-4. Tariff 2 Total / Import / Export Reactive Energy (kVarh) (SDM54-2T only)

3. Phase to Neutral Voltages (L1-N, L2-N, L3-N)

4. Phase to Phase Voltages (L1-2, L2-3, L3-1)

Frequency (Hz)

5. Phase Currents (L1, L2, L3)

6. Neutral Current (N)

7. Total Power Factor and Phase Power Factors (T, L1, L2, L3)

8. Total Power Factor (alternative display)

9. Maximum Current Demand per Phase (L1, L2, L3)

10. Maximum Active Power Demand per Phase (L1, L2, L3)

11. Total Active Power (W), Total Reactive Power (Var), Total Apparent Power (VA)

12. Active Power per Phase (L1, L2, L3) (W)

13. Reactive Power per Phase (L1, L2, L3) (Var)

14. Apparent Power per Phase (L1, L2, L3) (VA)

1. Press and hold the Enter button (Arrow icon).

2. The screen will prompt for a password (“Password:”).

3. Use the Scroll button to change the flashing digit and the Enter button to move to the next digit. Enter the correct password (default is 1000).

4. Once the correct password is confirmed with the Enter button on the last digit, the main Set-up menu appears.

5. The main menu options are: 1. Main, 2. Com. (Communication), 3. Time, 4. Pulse.

6. Use the Scroll button to highlight the desired menu option and the Enter button to select it.

7. Within sub-menus, use the Scroll button to cycle through options/values and the Enter button to confirm or move to the next setting.

8. Use the Scroll button to exit from sub-menus or the main Set-up menu.

The ‘Main’ menu (Option 1) contains the following settings:

• 1.1 Sys. Type: Select the electrical system type the meter is connected to. Options: 3P4W (Three Phase Four Wire – default), 1P3W (Single Phase Three Wire), 1P2W (Single Phase Two Wire).

• 1.2 Password: Allows you to change the access password (default 1000).

• 1.3 Reset: Allows you to reset the stored Maximum Demand (Max. dmd) values for current and active power.

The ‘Com.’ menu (Option 2) allows configuration of the RS485 Modbus communication parameters (relevant for SDM54-M and SDM54-2T models):

• 2.1 Addr: Set the Modbus Address for the meter. Range: 001 to 247.

• 2.2 Baud: Set the communication speed (baud rate). Options: 2400, 4800, 9600 (default), 19200, 38400 bps.

• 2.3 Parity: Set the communication parity. Options: None (default), Even, Odd.

• 2.4 Stop: Set the number of stop bits. Options: 1 (default) or 2.

Note: For the SDM54-MB model, similar settings would apply for M-Bus if configurable through the menu, though the PDF focuses on Modbus setup details here.

The ‘Time’ menu (Option 3) allows configuration of time-related settings:

• 3.1 Backlight: Set how long the display backlight stays on after a button press. Options: on (always on), off (always off), 5, 10, 15, 30, 60 (default), 120 minutes.

• 3.2 Scroll: Set the automatic screen scrolling interval. When enabled, the display cycles through measured parameters automatically. Options: off (default), 5, 10, 15, 30, 60 seconds.

• 3.3 DMD: Set the interval period over which Maximum Demand is calculated. Options: 0 (likely disabled), 5, 8, 10, 15, 20, 30, 60 (default) minutes.

The ‘Pulse’ menu (Option 4) allows configuration of the parameters for configurable Pulse Output 1 (Pulse Output 2 is fixed):

• 4.1 type: Select the type of energy that Pulse Output 1 represents. Options: kWh (total), Imp-kWh (import active), Exp-kWh (export active – default), kVarh (total reactive), Imp-kVarh (import reactive), Exp-kVarh (export reactive).

• 4.2 Constant: Set the pulse output constant (impulses per energy unit). Options: 400 (default), 100, 10, 1, 0.1, 0.01 imp/unit (unit depends on ‘type’ selection).

• 4.3 Width: Set the duration of the pulse output signal. Options: 60, 100 (default), 200 mS (milliseconds).

• Power Supply: Self-powered via measured voltage

• Consumption: <1W, 8VA

• Basic Current (Ib): 10A

• Max Current (Imax): 100A

• Min Current: 0.5A

• Starting Current: 0.02A

• Over-current withstand: 30 x Imax (3000A) for 0.01s

• L-N Voltage: 100 to 289V AC (not applicable for 3p3w supplies)

• L-L Voltage: 173 to 500V AC (3p supplies only)

• Frequency: 50Hz (MID version), 50/60Hz (non-MID version)

• Accuracy:

– Active Energy: Class 1 (IEC62053-21) / Class B (EN50470-3)

– Reactive Energy: Class 2 (IEC62053-23)

– 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

• Operating Temperature: -40°C to +70°C

• Storage Temperature: -30°C to +80°C

• Relative Humidity: 0 to 90%, non-condensing @ 40°C

• Altitude: Up to 2000m

• Mechanical Environment: M2

• Electromagnetic Environment: E2

Applicable to SDM54-M and SDM54-2T models:

• Baud Rate: 2400, 4800, 9600 (default), 19200, 38400 bps

• Parity: None (default), Odd, Even

• Stop Bits: 1 (default) or 2

• RS485 Address: 001 to 247

• Response Time: <80ms

• Transmission Distance: Up to 1000m

Applicable to the SDM54-MB model:

• Baud Rate: 300, 600, 1200, 2400, 4800, 9600 bps

• Parity: Even or Odd

• Stop Bits: 1 or 2

• M-Bus Primary Address: 001 to 250

• M-Bus Secondary Address: Same as the serial number of the meter.

• Measurement Category: IEC 61010-1 CAT III

• Current Input: Direct connect

• Over-voltage Category: CAT III

• Dielectric Withstand: IEC 61010-1 double insulated

• Protective Class: Class II

• EMC Standards: IEC 61326-1:2013; IEC 61326-2-3:2013

• Dimensions (WxHxD): 54 x 100 x 67.5 mm

• Mounting: DIN Rail 35mm

• Ingress Protection: IP51 (front panel, indoor use)

• Material: Self-extinguishing UL94 V-0

• Weight: 265g

For a 3P4W system:

• Connect Phase 1 Live IN to Terminal 1, Load OUT to Terminal 2.

• Connect Phase 2 Live IN to Terminal 4, Load OUT to Terminal 5.

• Connect Phase 3 Live IN to Terminal 3, Load OUT to Terminal 6.

• Connect Neutral IN and Load Neutral OUT to Terminal 9.

For a 1P3W system (likely referring to systems with two live lines and neutral, check local standards):

• Connect Live 1 IN to Terminal 1, Load L1 OUT to Terminal 2.

• Connect Live 2 IN to Terminal 4, Load L2 OUT to Terminal 5.

• Connect Neutral IN and Load Neutral OUT to Terminal 9.

(Note: Ensure Sys. Type is set to 1P3W in setup).

For a 1P2W system:

• Connect Live IN to Terminal 1, Load Live OUT to Terminal 4 (Note: terminal usage differs from 3P4W).

• Connect Neutral IN and Load Neutral OUT to Terminal 9.

(Note: Ensure Sys. Type is set to 1P2W in setup).

The auxiliary terminals have the following functions depending on the meter model:

• Terminals 7 & 8 (SDM54-2T): 230V AC Input for Double Tariff control. Apply voltage here to switch to Tariff 2 recording.

• Terminals 11 & 12 (SDM54-M / SDM54-2T): RS485 Communication Port. Terminal 11 is B-, Terminal 12 is A+.

• Terminals 11 & 12 (SDM54-MB): M-Bus Communication Port. Terminal 11 is Bus 1, Terminal 12 is Bus 2.

• Terminals 13 & 14: Configurable Pulse Output 1. Terminal 13 (+), Terminal 14 (-).

• Terminals 15 & 16: Fixed Pulse Output 2 (Active kWh). Terminal 15 (+), Terminal 16 (-).