Introduction
The SDM530CT-Mbus measures and displays the characteristics of three phase four wires (3p4w) supplies, including voltage, frequency, current, power, active and reactive energy, imported or exported. Energy is measured in terms of kWh, kVArh. Maximum demand current can be measured over preset periods of up to 60 minutes. In order to measure energy, the unit requires voltage and current inputs in addition to the supply required to power the product.
SDM530CT-Mbus can be configured to work with a wide range of CTs, giving the unit a wide range of operation. Built-in interfaces provides pulse and Mbus. Configuration is password protected.
Measured Parameters
The unit can monitor and display the following parameters of four phase four wires (3p4w) supply.
Voltage and Current
Phase to neutral voltages 176 to 274V a.c.
Voltages between phases 304 to 475V a.c.
Power factor and Frequency and Max. Demand
Frequency in Hz
Instantaneous power:
Power 0 to 9,900,000 W
Reactive Power 0 to 9,900,000 VAr
Volt-amps 0 to 9,900,000 VA
Maximum demanded power since last Demand reset Power factor
Maximum neutral demand current, since the last Demand reset
Energy Measurements
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 9999999.9 kVArh
Total active energy 0 to 9999999.9 kWh
Total reactive energy 0 to 9999999.9 kVArh
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
Interfaces for External Monitoring
Three interfaces are provided:
an MBus communication channel that can be programmed for MBus EN13757-3 protocol
an Pulse output(Pulse 1) indicating real-time measured energy.(configurable)
an Pulse output(Pulse 2) 400imp/kWh
The Mbus configuration (Baud rate etc.) and the pulse output assignments (kW/kVArh, import/export etc.) are configured through the Set-up screens.
Pulse Output
The unit provides two pulse outputs. Both pulse outputs are passive type.
Pulse output 1 is configurable. The pulse output can be set to generate pulses to represent total / import/export kWh or kVarh.
The pulse constant can be set to generate 1 pulse per:
0.01 = 10 Wh/VArh
0.1 = 100 Wh/VArh
1 = 1 kWh/kVArh
10=10Wh/kVArh
100 = 100 kWh/kVArh
1000= 10000 kWh/kVArh
Pulse width: 200/100/60ms
Pulse output 2 is non-configurable. It is fixed up with active kWh. The constant is 1000imp/kWh.
MBus Output for EN_13757-3
For MBus EN13757-3, the following MBus communication parameters can be configured from the Set-up menu:
Baud rate 300, 600, 1200, 2400, 4800, 9600
Parity none (default)/odd/even
Stop bits 1 or 2
MBus network primary address nnn – 3-digit number, 001 to 250
MBus network secondary address 00 00 00 01 to 99 99 99 99(The secondary address can not be setted directly on meter, but can be done via Mbus communication)
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 waveform 50 or 60Hz ±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 1 minute
Vibration 10Hz to 50Hz, IEC 60068-2-6, 2g
