1. Summarize

Three-phase Programmableintelligent digital display measuring and controlling meters are applied inelectric power network and automatic control system, mainly measuring all theparameters in the power system, such as current, voltage, frequency, powerfactor, active power, reactive power and so on. In according to its additionalfunctions, the meters can be divided into X, K, D, S four series.

X series of intelligent digitaldisplay meters, mainly measure and display the electrical parameters in theelectric power network, such as current, voltage, power, frequency and powerfactor and so on, with the features of intuitive display, high precision, goodreliability, anti-vibration, etc. AC True effective value measurement can beused to a serious wave distortion place.

On the basis of X series ,Kseries intelligent digital display meters have added with the functions ofsetting ratio keyboard and one channel RS485 communication interfaceoutput(supports Modbus RTU protocol) in order to facilitate digital displaymeters in the group networking.

D series digital displaytransmission meters on the basis of X Series meters have added with thefunctions of analog transmitting output(4-20m A and so on) and one channel RS485communication interface which supports Modbus-RTU protocol, and can be directlythree lines digital display or single-line digital switch.

S series Digital alarm monitoringcontrol meters have increased the functions of relay output (to achieve “theexcess limit alarm or telecontrol function”) on the basis of X series meters: RS485digital interface which supports Modbus-RTU implement “remote” function, thevariable ratio and communication parameters can be easily and momentarily setthrough meter panel buttons.

The Products meet the standardof GB/T22264.1-2008, GB/T 13978-2008.

2.Typical Product Pictures

3. Models and Meaning of Products

4.Products Models

5.Technical Specifications

6.Outline Dimension

DC284U-2S4

DC284U-9S4

DC284U-AS4

7.Typical Signal Input Wiring Diagram

 Note: the above diagram is only for reference, the actual parameters in the factory shall prevail.

Wiring Instruction:

• Inputvoltage cannot exceed rated input voltage (100V or 400V), otherwise shouldconsider using PT, in order to make maintenance easily, advice to use connectorbar.

• Standardrated input current is 5A or 1A, if in the situation of more than 5A, shoulduse exterior CT. If using CT with other meters, wiring method should be seriesconnection, before removing the wire of input current, make sure that cut offCT one circuit or Short sub-secondary circuit in advance, in order to makemaintenance easily, advice to use connector bar.

• Makesure input voltage is correspond with input current, phase no. consistent,directions are consistent, otherwise the value and the symbol of power andelectric energy will be wrong.

• Themeter can work in three-phase four-wire or three-phase three-wire mode, theusers should select the appropriate wiring way based on the site situation.Usually under the situation without center line, use three-phase three-wiremode, while three-phase four-wire mode under the situation of center line.Please pay attention that onsite wiring mode must be consistent with the wiringdefault setting of the meter, otherwise the data of measured by meters will beincorrect.

  8. OrderingExample

  When order please specify the required models, power supply,signal input, the transformation ratio, display requirements and relativecontent. Accuracy class, the default is Class 0.5. For example, if need Class0.2, please specify when ordering.

• Model: DC284U-AS4

• Power supply: AC 220V

• Signal Input: AC380V

• Signal Output: AC250V/5A

• Other: otherfactory pre-sets (if no indication when ordering, ex-factory products will bedelivered in accordance with the default setting).