SDM630 Three Phase Multi Function Smart energy Meters

Product Overview

Description

Brief Introduction

SDM630M is an accurate and cost effective solution for measurement and display all major electrical and power quality parameters. Its easy programming, mounting and user friendly naviagation make it an ideal choice for customer who require reliable energy measurement.

SDM630M is bulit high quality standard utlising the latest microprocessor and manufacuring technology. The product features a DIN-rail enclosure, backlit LCD display and user programmable CT ratios. All access via an intuitive user interface.

 

Unit Characteristics

The SDM630 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 1phase2wire, 3phase 4wires

CT primary current (1 to 9999A)

PT (1 to 500000V)

Demand Interval time

Reset for demand measurements

Pulse output duration

 

A pulse output indicates real-time energy measurement. An RS485 output allows remote monitoring from another display or a computer.

 

 

Current Transformer Primary Current

The unit can be configured to operate with CT primary current of between 1 and 9999A. Maximum CT primary current corresponds to a maximum input current to the unit of 5A.

  

RS485 Serial – Modbus RTU

This uses an RS485 serial port with Modbus RTU protocol to provide a means of remotely monitoring and controlling the SDM630.Set-up screens are provided for setting up the RS485 port.

 

Pulse output

This provides 2 pulse outputs that clocks up measured active and reactive energy. The constant for reactive energy is 3200imp/kVarh. The pulse width for active energy can be set from the Set-up menu.

 

 

Measured Parameters

The unit can monitor and display the following parameters of a single phase, 3-phase 3-wire or 3-phase 4-wire supply.

 

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)

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 on each phase – 1 to 9999A range, set by external current transformer(s) (CTs)

Current THD% for each phase

 

Power factor and Frequency and Max. Demand

Frequency in Hz

Instantaneous power:

Power 0 to 3600 MW

Reactive Power 0 to 3600 MVAr

Volt-amps 0 to 3600 MVA

Maximum demanded power since last Demand reset Power factor

Maximum neutral demand current, since the last Demand reset (three phase supplies only)

 

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

 

Measured Inputs

Voltage inputs through 4-way fixed connector with 2·5mm2 stranded wire capacity. 3-Phase 3- and 4-wire and Single-phase 2-wire unbalanced. Line frequency measured from L1 voltage or L3 voltage.

Three current inputs (six physical terminals) with 2·5mm2 stranded wire capacity for connection of external CTs. Nominal rated input current 5A or 1A a.c. Rms.

 

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 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.

 

Auxiliary Supply

Two-way fixed connector with 2·5mm2 stranded wire capacity.

85 to 275V a.c. 50/60Hz ±10% or 120V to 380V d.c. ±20%. Consumption < 10W.

 

Interfaces for External Monitoring

Three interfaces are provided:

lan RS-485 communication channel that can be programmed for Modbus RTU protocol

lan relay output indicating real-time measured energy.(configurable)

lan pulse output 3200imp/kWh (not configurable)

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

 

Pulse width 200/100/60 ms.

Relay Rating 240V ac 50mA

 

 

 

 

 

 

 

 

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