SDM630 Modbus 3-phase electricity meter
For use with current transformators (Coils) 50 A and up. We stock 50, 100 and 200 A coils.
With Modbus RTU, pulse output suitable for logging.
Modular device for DIN rail 35mm, width: 4 modules (72.3 mm), the display shows Volts, Watts, Apmeres, Frequecy, Power factor and more.
MANUAL SDM630 MODBUS MCT V2
Order 50A/1A coils
Order 100A/5A split core coils
Order 200A/5A Split Core Coils
5.1 Measured Parameters
The unit can monitor and display three phase four wire (3p4w) supply.
5.1.1 Voltage and Current
Phase to neutral voltages 100 to 289V a.c.
Voltages between phases 173 to 500V a.c.
Percentage total voltage harmonic distortion (THD%) for each phase to N
Percentage voltage THD% between phases
Current THD% for each phase
Power factor and Frequency and Max. Demand
Frequency in Hz
Power 0 to 3600 MW
Reactive Power 0 to 3600 MW
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)
Imported active energy 0 to 9999999.9 kWh
Exported active energy 0 to 9999999.9 kWh
Imported reactive energy 0 to 9999999.9 kVArh
Exported reactive energy 0 to 999999.99 kVArh
Total active energy 0 to 9999999.9 kWh
Total reactive energy 0 to 9999999.9 kVArh
Terminals for cables is 2.5 mm2
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
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 RS-485 communication channel that can be programmed for Modbus RTU protocol
an relay output indicating real-time measured energy.(configurable)
One fixed pulse output 3200 Imp/kWh
The Modbus configuration (Baud rate etc.) and the pulse relay output assignments (kW/kVArh,
import/export etc.) are configured through the Set-up screens.
Pulse Relay Output
The pulse relay 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/kWarh
Pulse width 200/100/60 ms.
Relay Rating 240V ac 50mA
RS485 Output for Modbus RTU
For Modbus RTU, the following RS485 communication parameters can be configured from the
Baud rate 2400, 4800, ,9600, ,19200, 38400
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.
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 ±2°C
Input waveform 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
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 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
35 mm DIN rail dimensions 72,3 x 100 mm (WxH) per DIN 43880
Mounting DIN rail (DIN 43880)
Material Self-extinguishing UL 94 V-0
Volt, Amps, Power, Power factor and more