DDSY283 Single-phase Prepayment Watt-hour Meter

Technical Brochure

Holley Metering Ltd.

Hangzhou

July 2010

DDSY283 Single-phase Prepayment Watt-hour Meter

1. General DDSY283 single-phase prepayment watt-hour meter complies with IEC 62053-21, and is designed to measure AC active energy with the frequency of 50Hz or 60Hz. By adopting advanced microprocessor to handle data collection, delivery and storage, as well as using shielded and sealed meter case, the meter features high metering accuracy, high overload, good electromagnetic immunity, low power consumption, and long service life. The user has to purchase credit before using electricity. The maximum allowed power can be set by the utility within the rated current range. The user card delivers data in a two-way mode and one user card is used with one meter only. There will be alarm by LED or by power disconnection when the meter is running out of credit. In addition, certain anti-tampering can also be achieved with software configuration. The meter shall be installed indoor or outdoor in a meter box, with working temperature -25℃~+55℃ and relative humidity 25%RH~95%RH. The meter shall be protected from the influence of dust, salt mist, dew, and any caustic element.

2. Main Technical Data 2.1 Specifications Model DDSY283 Rated Voltage 240V Basic Current (Maximum Current) A

10(60)

Accuracy Class Active Class 1 Constant 800imp/kWh Display LCD Note: Other specifications are available upon request. 2.2 Basic Error

Load Power Factor COSφ Basic Error (%) Class 1

0.05Ib 1.0 ±1.5 0.1Ib-Imax 1.0 ±1.0 0.1Ib 0.5L 0.8C ±1.5 0.2Ib-Imax 0.5L 0.8C ±1.0 2.3 Starting: 0.004Ib at the rated voltage, rated frequency and COSφ=1.0 2.4 Running with no load: no more than one pulse at 115%Un 2.5 Power loss as per IEC requirements

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DDSY283 Single-phase Prepayment Watt-hour Meter

3. Mechanical Structure and Working Principle 3.1 The meter uses flame-resistant ABS case with good mechanical strength, sealing tightness, and shielding property. 3.2 Working Principle The meter collects voltage signals from the voltage divider and current signals from the shunt. The product of the two is got through the multiplying unit. After frequency converting, the counting pulses will be got with direct proportion of frequency and product of voltage and current. The diagram is shown as below.

Energy Signal

Relay

Management System

CPU

Memory Unit

LCD Display

Energy Input/Output

IC Card

3.3 Data Processing The counting pulses will be sent to CPU through optical coupler and will be stored in nonvolatile EEPROM after calculation. The data (energy, controlling requirements, etc.) set by the PC software are written into the cards through card reader/writer, and transferred into the microprocessor in the meter to give signals of display, alarming and disconnection after CPU operation.

4. Main Functions 4.1 One card works for one specific meter only. In the case of card loss, the user can go to the utility (credit vending station) to replace one. The old card then becomes invalid. 4.2 Newly bought credit is accumulated to remaining credit 4.3 When the meter is working, total kWh consumed and credit available will be displayed in turn. 4.3.1 LCD full screen

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DDSY283 Single-phase Prepayment Watt-hour Meter

TOTAL: Total kWh consumed (combined with POWER) or total credit purchased

(combined with BUY) BUY: Credit purchased ODD: Credit available LOW: Low credit alarming ID: Meter no. CONST: Constant COUNT: Number of purchasing LIMIT: Maximum credit limit or debit limit CUT: Disconnection

4.3.2 Example: Total energy consumed is 0.

4.3.3 Example: Credit available is 8888 kWh.

4.4 Over-power alarm: The meter can be set as disconnected when the user consumes energy over the limited power. In this case of energy overusing, the alarming LED flashes swiftly and the meter will be disconnected in 60 seconds. After that, the LCD will show a 180 seconds count-down. The meter will be connected after the user

serts the user card, or connected automatically after 180 seconds. Power limit can be

h), the newly bought credit will not be added and the CD indicates 9999kWh and LIMIT. The credit purchased remains valid. Credit limit

inset by the software. 4.5 Maximum credit limit: If newly bought credit + credit available > maximum credit limit (default 9999kWLcan be set by the software. 4.6 Precaution: When credit available is less than twice of alarming credit, the

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DDSY283 Single-phase Prepayment Watt-hour Meter

alarming LED flashes every second to remind the user to buy credit. In this case, when the user card is inserted into the meter, the flash interval of the alarming LED

ill change to every other second to avoid disconnection. Alarming credit can be set

ected by inserting the ser card. In case that the meter’s own card cannot be found, the user can borrow

.8 Credit purchasing reminding: When credit available is less than alarming credit, on to remind the user to buy credit.

.1 One card works for one specific meter only. In the case of card loss, the user can

.2 Before buying credit, the user shall insert the card into the meter to bring the

r, and at the me time run the computer software to write encrypted data such as user ID, credit

use the card, insert it into the meter. If it is a valid card, the data will be utomatically transferred into the meter. The LCD displays following information in

turn.

Credit purchased (e.g. 8888kWh)

l credit purchased (e.g. 8888kWh)

Number of purchasing (e.g. the second purchase)

wby the software. 4.7 Disconnection alarm: If the user does not insert user card in the case of precaution, the meter will be disconnected when the credit available reaches alarming credit and the LCD indicates “CUT”. The meter can be connuanother card and insert into the meter to resume power supply. 4the alarming LED keeps

5. User Instruction 5go to the utility (credit vending station) to replace one. 5meter data back to the computer database. 5.3 To load credit to the card, insert the card into the card reader/writesabought, alarming credit, power limit pattern and limit level into the card. 5.4 Toa

Tota

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DDSY283 Single-phase Prepayment Watt-hour Meter

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WWhh((TToo rreemmiinndd tthhee uusseerr ttoo bbuuyy wwhheenn tthhee ccrreeddiitt uusseess uupp..))

((WWhheenn tthheerree iiss aaggrreeeemmeenntt dd

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SSttaattuu

))

ss iinnddiiccaattiioonn FF00XX==0000..0000,, wwhheerree XX mmeeaannss ddiiffffeerreenntt mmeetteerr vvss.. ccaarrdd

ssttaattuuss,, ddeettaaiillss aass bbeellooww:: XX==00:: CCaarrdd nnoott iinnsseerrtteedd;; XX==11:: CCaarrdd aacccceepptteedd bbyy tthhee mmeetteerr aanndd ddeebbiitt ddeedduucctteedd;; XX==22:: IInn nnoorrmmaall ssttaattuuss,, rreeaaddyy ttoo aacccceepptt ccrreeddiitt;; XX==33:: RReeppllaacceedd ccaarrdd aassttllyy;; iinnsseerrtteedd llXX==44:: AAccccoouunntt ccaanncceelllleedd,, rreessttoorree ccaarrdd ttoo bbee aacccceepptteedd;; 0000..0000:: PPoowweerr lliimmiitt

it available will be displayed in turn.

When an invalid card is inserted, the LCD will display an error code as below:

The code indicates card data error or invalid card.

6 When LCD displays zero credit or negative value, and CUT sign, if the meter is the utility.

his function is invalid when the meter is in factory (Meter ID = 0) and will only be

he function is also invalid in installation so that no inconvenience will be caused to

After that, only total energy consumed and cred Note: Withdraw the card and keep it properly. 5.5

5.still working, the user shall buy credit immediately, and report the failure to

6. Disconnection upon opening the terminal cover (optional) Tvalid after opening account (Meter ID ≠ 0) and purchasing credit for the first time.

Tthe utility.

If the user opens the terminal cover when the meter is in normal working status, the

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DDSY283 Single-phase Prepayment Watt-hour Meter

meter will be disconnected and the LCD will show CUT once a second as well as an error code E=08. In this case, the meter can only be connected by the utility with

anagement card after they come to check and make sure that there is no any failure

d twice, and meter reset: the sign CUT keeps on. Disconnection in case of opening terminal cover: the sign CUT flashes once a

valid when a valid card is serted into the meter.) The LCD will exit checking status and resume normal cyclic

ier way. By pressing the button ithout releasing it, the meter can be reset only by inserting the reset card, which does

elow.

ormal working status: eter and insert the reset card

. Meter ID shall be filled in when making reset card. ponding software is valid.

8. M

mor tampering behavior. There are two types of disconnection alarming display: 1. Disconnection in cases of low credit, overload, account cancellation, inserting

check car2.

second.

7. Buttons (optional) and Meter Reset

The blue button is for checking meter data such as meter ID, total credit purchased, current credit purchased, alarming credit, number of purchases, date of purchase, power limit and current power. (Note: The button is inindisplay if the button has not been pressed for 15 minutes. The red button is for resetting the meter in an easwnot need to meet points 2 and 3 as described b

To reset the meter in n1. Disconnect the meter for 5 seconds, reconnect the m

within 2 minutes. 23. Only the reset card made by the corres

eter Installation and Wiring

Do not install and wire the meter when it is live! 8.1 All meters are inspected and tested to be eligible before shipment. If the meter

als are missing or the meters have been kept in storage too long, the meters shall be

place, with 1.8M as the suggested stallation height. If installed in a dirty place or a place where damage to meter may

secalibrated and sealed by relevant organization before installation. 8.2 The meter shall be fixed vertically without any leaning on a firm and flame-resistant wall in a dry and ventilated inoccur, the meter shall be protected by a cabinet.

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DDSY283 Single-phase Prepayment Watt-hour Meter

8.3 The meter shall be wired as shown in the wiring diagram below. Copper wires are tightly.

.5 Due to the function of disconnection upon opening the terminal cover, the st be fixed before opening account and inserting user card.

9. Meter Outline

recommended. Screws in the terminal box shall be screwed down

8.4 The meter will start to work properly after being wired correctly.

8terminal cover mu

10. Wiring Diagram

11. Meter Transportation and Storage 11.1 When being transported, stored and unpacked, the meters shall avoid violent

e meters shall be kept in original packages with ambient temperature of 5℃―+70℃, relative humidity less than 95%, and without any caustic element in

impact. 11.2 Th-2the air.

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DDSY283 Single-phase Prepayment Watt-hour Meter

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1.3 The meters shall be kept on shelves with maximum pileup of 5 cartons. Once npacked, maximum 10 single meter boxes can be piled up.

. Wuchang Avenue, Yuhang District

Email: overseas@holley.cn Http://www.holleymeter.com

1u Holley Metering LtdNo. 181Hangzhou 310023 China Tel: +86-571-89300666 Fax: +86-571-89300777