Eastron SDM54 Series Smart Three Phase Energy Meter

1. Introduction

The SDM54 measures and displays the characteristics of single-phase two-wire (1p2w) and three-phase four-wire (3p4w) supplies, including voltage, frequency, current, power, power factor, active and reactive energy, imported or exported. Energy is measured in terms of kWh and kVArh. Maximum demand on power and current can be measured over preset periods of up to 60 minutes. The SDM54 supports a maximum of 100A direct loads per phase, with dual tariff management availability. The meter is designed for DIN-rail mounting, with IP51 front protection. The meter is optionally equipped with pulse outputs, RS485 Modbus port, or M-bus port. Configuration can also be done via keypad, which is password protected.

1.1 Unit Characteristics

The SDM54 Series are smart three-phase energy meters, covering 3 models with the following features and differences:

1.2 RS485 Serial–Modbus RTU

The RS485 serial port with Modbus RTU protocol provides a means of remotely monitoring and controlling the unit. Set-up screens are provided for setting up the RS485 port. D/LT645 protocol is optionally available on request.

1.3 M-Bus

The M-Bus port complying with EN13757-3 protocol provides a means of remotely monitoring and controlling the meter. Set-up screens are provided for setting up the M-Bus port.

1.4 Pulse outputs

Two pulse outputs that clock up the measured active and reactive energy. The constant of pulse output 2 for active energy is 400imp/kWh (unconfigurable), its width is fixed at 100ms. The default constant of configurable pulse output 1 is 400imp/kWh, default pulse width is 100ms. The configurable pulse output 1 can be set from the set-up menu.

1.5 Double Tariffs

The meter has double tariffs function for cost allocation management. There are two terminals to monitor voltage input from an external device. Once voltage is detected within 230V (80~120%), the energy will be counted in another register.

2. Start-up Screens

The interface performs initial testing. The second screen indicates the software version. Meter serial number, Modbus ID, and Baudrate information are provided. After a short delay, the screen will display active energy measurements.

3. Measurements

Use the buttons to scroll the display for data-check or change options in Set-up mode. Press and hold a button to enter Set-up mode.

3.1 Buttons

There are two buttons on the front panel.

3.2 Measured parameters

Each successive pressing of the button shows different measured parameters:

• Total kWh
• Import kWh
• Export kWh
• Total kVarh
• Import kVarh
• Export kVarh (Available in SDM54-2T only)
• Tariff 1’s active energy (Total kWh, Import kWh, Export kWh) - The “_” under T1 means tariff 1 is running. (Available in SDM54-2T only)
• Tariff 1’s reactive energy (Total kVarh, Import kVarh, Export kVarh) (Available in SDM54-2T only)
• Tariff 2’s active energy (Total kWh, Import kWh, Export kWh) (Available in SDM54-2T only)
• Tariff 2’s reactive energy (Total kVarh, Import kVarh, Export kVarh) (Available in SDM54-2T only)
• L1-N Voltage
• L2-N Voltage
• L3-N Voltage
• L1-2 Voltage
• L2-3 Voltage
• L3-1 Voltage
• Frequency
• L1 Current
• L2 Current
• L3 Current
• Neutral Current
• Total PF (Power Factor)
• L1 PF
• L2 PF
• L3 PF
• Total PF (Power Factor)
• Max. Current Demand of L1, L2, L3
• Max. Active Power Demand of L1, L2, L3
• Active Power
• Reactive Power
• Apparent Power
• Active Power of L1, L2, L3
• Reactive Power of L1, L2, L3
• Apparent Power of L1, L2, L3

4. Set-up

Password is needed before any further operation. The default password is 1000. The left screen shows the set-up menu of the meter, including main, communication, time, and pulse settings.

• System type: The network type where the meter is installed and working. Options: 3P4W (default), 3P3W, 1P3W, 1P2W.
• Password: Allows the user to set a new password.
• Reset: To reset the max. Demand / DI.
• DMD: Information of current and active power.
• DI: Digital input counts.
• Com.: Configure the communication parameters.
  • Addr: Communication MODBUS Address, range from 001~247.
  • Baud: Communication baud rate. Options: 2400~38400bps; Default: 9600bps.
  • Parity: Communication Parity Options: None, Even, Odd. Default: None.
  • Stop: Stop bit of communication. Options: 1 or 2. Default: 1.
• Time information setting:
  • Backlight: To set the backlight duration time after button operation. Options: on, off, 5, 10, 15, 30, 60, 120 minutes. Default: 60 minutes.
  • Scroll: Automatic screen scroll time interval. Options: off, 5, 10, 15, 30, 60 seconds. Default: off.
  • DMD: Demand interval time. Options: 0, 5, 8, 10, 15, 20, 30, 60 minutes. Default: 60 minutes.
• Pulse output 1 parameter setting: The meter's pulse output 1 is configurable. Note: Pulse output 2 is fixed.
  • Type: The type of energy that pulse output refers to. Options: kWh; Imp-kWh; Exp-kWh; kVarh; Imp-kVarh; Exp-kVarh. Default: Exp-kWh.
  • Constant: Pulse output constant. Options: 1000; 100; 10; 1. Default: 400.
  • Width: Pulse width. Options: 60, 100, 200mS. Default: 100mS.

5. Specifications

5.1 Electrical specifications

• Power: Self-power supply (via measured voltage).
• Consumption: <1W, 8VA.
• Basic current: 10A.
• Max. current: 100A.
• Min. current: 0.5A.
• Starting current: 0.02A.
• Over-current: 30 x Imax for 0.01s.
• L-N voltage: 100 to 289V a.c. (not for 3p3w supplies).
• L-L Voltage: 173 to 500V a.c. (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.

5.2 Environmental specifications

• Operating temperature: -25°C to +55°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.

5.3 Output specifications

Three interfaces are available:

• Modbus RS485 port output (SDM54-M, SDM54-2T, SDM54-DI).
• M-Bus port output (SDM54-MB, SDM54-MB-2T).
• Two Pulse outputs.

5.3.1 Modbus RS485 port output

• Baud rate: 2400, 4800, 9600 (default), 19200, 38400.
• Parity: none / odd / even.
• Stop bits: 1 or 2.
• RS485 address: 001 to 247.
• Response time: <80mS.
• Transmission distance: 1000m.

5.3.2 M-Bus port output

• Baud rate: 300, 600, 1200, 2400, 4800, 9600.
• Parity: even / 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.

5.3.3 Pulse Output

The unit provides two pulse outputs indicating real-time measured energy. Pulse output 1 is configurable; Pulse output 2 is fixed with a constant of 400imp/kWh. Both pulse outputs are passive type. Pulse output 1 is configurable. Default setting is exp-kWh; 100mS, constant 400imp/kWh. Pulse output 2 is non-configurable. It is fixed with active kWh. The constant is 400imp/kWh.

5.4 Safety and EMC

• 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: II.
• EMC: IEC 61326-1:2013; IEC 61326-2-3:2013.

5.5 Mechanics specifications

• DIN rail dimensions: 54x100x67.5mm (WxHxD).
• Mounting: DIN Rail 35mm.
• Ingress protection: IP51 front panel (indoor).
• Material: Self-extinguishing UL94 V-0.
• Weight: 265g.

6. Dimensions

Diagram showing the dimensions of the SDM54 meter: Width 54mm, Height 105mm, Depth 67.5mm. The front panel height is 49.6mm.

7. Wiring diagram

Three Phase Four Wires: Diagram shows connections for L1, L2, L3, N, and outputs 1, 2, 3, 4, 5, 6.

Single Phase Two Wires: Diagram shows connections for L1, N, and outputs 1, 2, 3, 4.

Other terminals: Diagrams show terminal connections for different SDM54 models:

• SDM54-2T: Terminals 7-8 (230V AC, 2 Tariffs), 9-10 (RS485 +), 11-12 (RS485 -), 13-14 (Pulse 1), 15-16 (Pulse 2).
• SDM54-M: Terminals 7-8 (RS485 +), 9-10 (RS485 -), 11-12 (Pulse 1), 13-14 (Pulse 2).
• SDM54-MB-2T: Terminals 7-8 (230V AC, 2 Tariffs), 9-10 (M-BUS +), 11-12 (M-BUS -), 13-14 (Pulse 1), 15-16 (Pulse 2).
• SDM54-MB: Terminals 7-8 (M-BUS +), 9-10 (M-BUS -), 11-12 (Pulse 1), 13-14 (Pulse 2).
• SDM54-DI: Terminals 7-8 (RS485 +), 9-10 (RS485 -), 11-12 (DI1), 13-14 (COM), 15-16 (DI2).
• SDM54-P: Terminals 7-8 (Pulse 1 +), 9-10 (Pulse 1 -), 11-12 (Pulse 2 +), 13-14 (Pulse 2 -).

8. EU Declaration of Conformity

This section declares that the electricity meter types listed (SDM54-2T, SDM54M, SDM54-DI, SDM54-MB-2T, SDM54-MB, SDM54-P) with the measurement range 3 x 230/400V 50Hz, 0.5-10(100)A 400imp/kWh, are in conformity with the EU-type examination certificate 0120/SGS0533. The meters fulfill the essential requirements of Directive 2014/32/EU and standards EN50470-1:2006 and EN50470-3:2006. The declaration is issued by Zhejiang Eastron Electronic Co., LTD.

9. MID certificate

Details of the MID certificate (0120/SGS0533) issued by SGS Fimko OY for Zhejiang Eastron Electronic Co., Ltd. The certificate is valid until February 21, 2032.

Contact Us

For any questions, please contact Zhejiang Eastron Electronic Co., Ltd. at No. 1369, Chengnan Rd., Jiaxing, Zhejiang, 314001, China. Tel: +86-573-83698881, Fax: +86-573-83698883, Email: sales@eastrongroup.com, Website: www.eastrongroup.com.