72X72,96X96 digital power meter, panel mounted.RS485 MODBUS

Application:

DT(S)SD178/179 measures important electrical parameters in three phase &replaces the multiple analog panel meters. It measures electrical parameters like AC Voltage, Current and Frequency, Power, Power Factor, Active Energy (Import/Export).

Product features:

Display:

Alphanumeric LCD display for viewing all parameters being monitored and for configuring at site CT/PT ratio reset and MODBUS communication settings (Address, baud rate, parity).

Energy measurement (Import and Export):

Active energy (kWhr), Reactive energy (kVArhr) and Apparent energy (kVAhr).

True RMS measurement:

The instrument measures distorted waveform up to 15th Harmonic.

Number of parameters measured: up to 40

The instrument measures 37 electrical parameters of 3 Phase network.

Compliance to International Safety standards

Compliance to International Safety standard IEC 414 / IEC 61010-1.

Parameter Programming:

DT(S)SD178/179 can be programmed by entering into the programming mode which is password protected. Programming mode can be used for configuring CT / PT ratio, reset and MODBUS communication settings (Address, baud rate, parity) at site.

Min Max storage of parameters possible

The instrument stores minimum and maximum values for System Voltage and System Current. Every 40 sec minimum and maximum readings are updated.

Energy Count Storage:

F  In case of power failure, the instrument memorizes the last energy count. Every 40 sec, the instrument updates the energy counter in the non-volatile memory

Configurable energy timing:

F  Values of Active energy (import/export), Reactive energy (import/export) are configurable 15 minutes / 1 hour

MODBUS (RS485) Output:

F  The MODBUS output enables the instrument to transmit all the measured parameters over standard MODBUS, RS485.

User Assignable Registers for MODBUS:

F  Customer can assign MODBUS register address as per his need for faster response time. The parameter to be acquired from DT(S)SD178/179 is selectable.

Configuration of the Instrument via MODBUS:

F  The instrument settings can be configured remotely via MODBUS (RS485) through PC

EMC Compatibility:

F  Compliance to International standard IEC 60688 /IEC 801-3/IEC 61326 / IEC61000-4-3

Mounting of Instrument:

F  Panel mounting is possible for DT(S)SD178/179

Technical specification:

Input Voltage:

F  Nominal input voltage (AC RMS): Phase–Neutral 63.5(57.7,220) V L-N / Line-Line 110(100,380) V L-L

F  Temporary overload protection: 120% of the rated voltage (that is range maximum*) as per IEC60688 standard.

F  Connections: Permissible cross section of the connection wires: <= 4.0 mm2single wire or 2 × 2.5 mm2fine wire

Input Current:

F  Nominal input current: 1 A or 5A (To be specified while ordering)

F  System CT primary values: Standard values up to 9999A

F  Temporary overload protection: 120% of rated value as per IEC 60688 standard

F  Connections: Permissible cross section of the connection wires: <= 4.0 mm2single wire or 2 × 2.5 mm2fine wire

Auxiliary Supply:

F  Auxiliary Supply: 48 VDC(24VDC,220VAC) ± 10%

VA Burden:

F  Nominal input voltage burden: < 0.20 VA approx. per phase

F  Nominal input current burden: < 0.60 VA approx. per phase

F  Auxiliary supply burden: < 4VA approx

High Voltage Test

F  2.2 kV AC, 50Hz for 1 minute between all electrical circuits

Size and Weight

F  Approx 460 gms

Permanent overload protection:

F  Voltage: 2 Times of rated voltage for 1 second, repeated 10 times at 10 second intervals as per IEC 60688 standard

F  Current: 20 Times of rated current  for 1 second, repeated 5 times at 300 sec interval as per IEC 60688 standard

Reference conditions for Accuracy as per IEC 60688:

F  Reference temperature: 23°C +/- 2°C

F  Input waveform: Sinusoidal

F  Input frequency: 50 or 60 Hz ±2%

F  Input voltage: Rated value

F  Power Factor: 0.8 Lag…1…0.8 Lead

Accuracy:

F  Voltage: ±0.2% of range

F  Current: ±0.2% of range

F  Frequency: ± 0.1%

F  Active Power: ±0.5% of range

F  Re-Active Power: ±0.5% of range

F  Apparent Power: ±0.5% of range

F  Apparent energy (kVAh): ±0.5% of range

F  Active energy (kWh): ±0.5% of range

F  Re Active energy (kVArh): ±0.5% of range

F  Power Factor: ±0.5% of unity

F  Angle: ±0.5% of range(0- 360 degree)

Measurement error is normally much less than errors specified in the above. Variation due to influence quantity is less than twice the error allowed for reference condition.

Applicable Standards:

F  Electromagnetic Compatibility: IEC60688, IEC 801-3(Level 1) / IEC61000-4-3 and IEC 61326

F  Terms, definitions & Test method: IEC 60688

F  High frequency disturbance /Immunity: As per IEC 60688 /IEC 61000-4-3

MODBUS:

RTU mode

Format of data bytes: 4bytes (32 bits) per parameter

Floating point format as per IEEE 754

Error Check bytes: 2 byte Cyclical Redundancy Check (CRC).

Byte format: 1 Start bit

8 data bit, least significant bit sent first.

1 bit for even/odd parity

1 stop bit if parity is used, 1 or 2 stop bits if no parity.