1. Purposes

3-Phase Multi-rate Tariff Kilowatt Hour Meter, handhold or infrared control is available for programming and meter reading. Or use RS-485 interface to communicate with PC. Meanwhile, this meter has broadcasting and timing functions in order to provide better service for automatic power consumption management in Government Power Supply Department. It is applied to measure single-phase AC active power with rated frequency of 50 Hz, and its performance is in accordance with GB/T17215-1998, DL/T645-1997

2. Features

This product is a High-Tech product designed and manufactured by IC Technology, most updated Electronic Technology and SMT Technology. And it owns advantages such as extraordinary resistance to electromagnetic interference, wide working voltage range, long service life, low power consumption, power theft-proof, being highly reliable and precise, and so on.

The power measurement part adopts ADE 7752 chip, after sampling signals from voltage and current circuit, electric value will be transformed into electric pulse signals. And the chip will calculate the electric pulses with corresponding rate according programs made by users, display and communicate for realize multifunctional measurement.

3. Structure

3.1 Infrared communication interface and RS 485 interface.

3.2 LCD display, dimension is shown in attachment 11. In normal working conditions, LCD’s service life>10 years.

3.3 Photoelectric isolated passive pulse output terminal with constant-width output signals.

3.4 Extra-brilliant, long service life LED to indicate working frequency.

3.5 In meter is a programming switch, pulse output wiring terminal, RS 485 interface wiring terminals.

3.6 In meter (on PCB) is a 1 Hz clock pulse testing port.

3.7 Three extra-brilliant, long service life LED to indicate period.

4. Specification and main technical data

4.1 Specification

Note: pulse constant shall be as marked on panel.

4.2 Reference frequency: 50 Hz, frequency range: 50 Hz＋－5%

4.3 Standard precision grade: 1.0 grade

4.4 Working temperature range: -15 °C- +55°C

Working temperature range: -20°C- +70°C

Storage and conveyance temperature range: -25°C- +70°C

4.5 Power consumption

Power consumption on voltage circuit: ≤2.0W 5 VA

Power consumption on current circuit: ≤2.5 VA (1b)

4.6 Clock precision

At reference temperature, within working voltage range, precision of interior clock is better than 0.5S/d. When power is cut off, and backup battery is used, after 24 hours, timing accuracy is better than 1 S/d, temperature changing factor if interior clock: ≤0.15S/d°C.

5. Functions

5.1 Measurement

5.1.1 Measure forward, reversed active power. (Reversed power can be calculated as forward power)

5.1.2 Self-judging on operating status: check whether battery is normal, meter is normal, communication is normal, clock is normal and power direction etc.

5.1.3 Power is calculated and stored separately as total, peak, plain and valley values.

5.1.4 Reversed active power is calculated as positive power.

5.1.5 Kilowatt Hour Meter is capable of storing frozen data in last 12 months.

5.1.6 When power if off, all stored data will be kept for more than 10 years.

5.1.7 Capable of presetting initial power and power in all periods in meter.

5.2 Clock, period and tariff

5.2.1 Clock in meter is a hardware clock circuit, with temperature compensation circuit to ensure that timing error within 30 s/month. The interior clock has functions of calendar, timing and automatic leap year switching etc.

5.2.2 Use green environment-friendly Li batteries, capacity ≥1200 mAh. When power is off, Li battery can sustain interior clock to work normally for 3 years, in product’s service life period (10 years), no need to replace Li battery.

5.2.3 Make programming randomly to set peak, plain and valley tariff rate, totally 12 periods, default setting is 2 periods, minimum interval between two periods is 30 minutes, and a period is capable of spanning the zero point.

5.2.4 In any period, deviation between actual start and end time and preset start and end time≤5 s.

5.3 Timing

5.3.1 when programming switch is on “Programming allowed”, and time can be written into meter randomly. When programming switch is on “programming forbidden”, only meters with time deviation within 5 minutes can be timed.

5.3.2 When programming is forbidden, time interval between two timings on a same meter shall ≥ 25 days.

5.3.3 For remote meter reading and detecting, state words are set in meter, and definitions are shown in attachment: “Single-Phase Electronic Multifunctional Kilowatt Hour Meter Communication Protocol”.

5.4 Display

5.4.1 Displayed number has 5-bit integer, 1-bit decimal fraction (reading number has 5-bit integer, 2-bit decimal fraction).

5.4.2 Cycling display required power information, cycling period can be set flexibly, range is 2-30 seconds, default is 10 seconds.

5.4.3 Chinese displayed items include:

Date; time; last month; communication (succeed); (Power) reversed; operating period (peak, plain and valley); power property (total, peak, plain, valley). Including: when displaying “(operating) period, peak, plain, valley”, it means the operating period, when displaying “peak, plain, valley, power”, it means the period of power.

5.4.4 Cycling display items include:

Operating period (peak, plain, valley); date; time; current total power; current peak power; current power; current valley power.

5.4.5 Self-testing display, fault codes will be displayed when faults occur. Descriptions of fault codes are shown in attachment 4.

5.4.6 Electric pulse indication: extra-brilliant and long service life, red LED indication, pulse width: 80 ms +/- 20 ms.

Period indication: extra-brilliant, long service life, red LED to indicate plain period, green LED to indicate green period, being always on, LED working current ≤5 mA.

5.4.7 Handhold terminal indication:

Date, time, number of meter, current total power, current plain power, current valley power, total power of last month, plain power of last month, valley power of last month, total power of the month before last, plain power before last, valley power before last.

5.4.8 3-Phase power supply indication
Extra-brilliant and long life LED indication, always being on when power is on.

5.5 Communication

5.5.1 Infrared communication and RS 485 communication, mutually independent.

5.5.2 communication baud rate is 1200 bps, half-duplexing, and respond time of command frame is 20 - 500 ms.

5.5.3 Infrared communication interface

To set parameters and second counter.

Communication distance: ≥4m  communication angle :≥±15゜

5.5.4 RS 485 Communication interface

To set parameters and second counter.

Interference resistance is in accordance with DL/T614-97, GB/T17215-98. Electrical isolation is applied between RS 485 interface and interior circuit in meter.

5.6 Output

5.6.1 Pulse output

Active power output to calibrate meter.

Passive photoelectric isolated output port. Waveform: standard square wave. Pulse width: 80 ms ± 20 ms

5.6.2 Second signal synchronous output interface

5.7 Programming

5.7.1 Programming control

Through infrared communication port, RS 485 interface to make programming in meter. To ensure reliability of data in meter, a protection method of hardware and software protection is adopted for programming in meter. Hardware is the programming switch. Software is the password. When programming switch is on “Programming allowed”, a user can make any programming in meter. When programming switch is on “programming forbidden”, only timing with in a certain error range is allowed. Programming switch cannot control operation in meter. Programming switch is on the PCB in meter. When being manufactured in factory, its parameters shall be set according to users’ requirements, and only three times of power clearing are available.

5.7.2 Programming password

When it is to make programming in meter, to ensure reliability of data in meter, password is applied for protection. The two kinds of passwords: programming password, clearing password. Initial password: 12345601 is programming password, 12345600 is clearing password. Programming switch does not restrict password changing.

5.7.3 Programming content

programming content includes following 7 items: time and date setting, multi-rate period setting, meter address setting, display mode and content setting etc.

5.7.4 Programming check

Checking functions of programming items only can be realized by handhold terminals and computer in management station.

Hand hold terminal: through “Reading time and date”, “Reading meter period”, “Reading meter parameters”, “Previous programming time” etc, for management personnel to check.

5.7.5 Programming security

Hand held terminals have two kinds such as “Meter reading terminal” and “Maintenance terminal”, only “Terminal maintenance” can realize programming of meter, and only entering 6-bit correct logging password (initial password is 123456), turning on programming switch can make a user allowed to make programming.

5.8 Meter reading

5.8.1 Daily meter reading

Through handhold terminal to read current date and time, number of meter, current total power amount, peak, plain and valley power amount.

5.8.2 Meter reading of data in history

Through “Read data in history” functional menu on hand hold terminal, to read frozen data in history of previous 12 months.

5.8.3 The hand hold terminal can read data in no fewer than 1000 Kilowatt Hour Meters.

5.8.4 System meter reading

Through RS 485 interface, remote automatic meter reading can be completed.

6. Installation and usage

6.1 Meter is available after checked and lead sealed.

6.2 Meter shall be installed in dry and well-ventilated areas indoors.

6.3 Wiring of meter shall be in accordance with wiring diagram on terminal cover.

6.4 Lightning protection is necessary to avoid damages by lighting striking where lighting storms are frequent.

6.5 Notes: pay attention to date, time and period.

7. Wiring:

7.1 Wiring diagram;

DTSF 855 and DSSF 855 type Kilowatt Hour Meter wiring diagram is as diagram 1-4:

7.2 Accessorial wiring terminals on upper row.