DDSY283 SINGLE PHASE PREPAYMENT METER
1. General
DDSY283 Single phase electronic prepayment meter complies with IEC 61036. The meter adopts
micro-electronic technology, has high precision, low power consumption.
Depends on adopting large-scale integration (LSI) and surface mounting technology (SMT) as
well, by using famous international brand components, it has high reliability and long service life. The
meter uses fire-resistant ABS, the structure of the meter is air-proofed, data operation by advanced
single-chip processing system.
The meter will remind the user to purchase the electricity by alarm when the electricity remained
is limited, and cut off the power supply automatically when the electricity use up. It’s also able to limit
maximal consuming power, anti-tamper function is optional. Each meter match with one memory card,
and the meter can exchange the data with card bi-directionally through the card read device. User won’t
lose electricity even he lost the user card, because a renewed card is acceptable.
2. Specification
Rated Voltage
120V, 220V, 230V, 240V
Reference frequency
50Hz or 60Hz
Basic Current
（Maximum Current）A
5(20)
10(40)
10(60)A
20(80)
3. Technical data
Applicable Standard
IEC 61036-2000
Service Lifetime
10 years
Accuracy Class
Class1, Class2
Working Temperature
-10℃～+75℃
Starting current
Class 1=0.004Ib; Class 2=0.005Ib.
Working Voltage Range
0.7～1.2Un
Power consumption
=2W、5VA
Over voltage protection
6kV
Relative humidity
=95%
4. Functions
■　Energy display by LCD
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■　Limit maximal consuming power
■　Automatic switch off power when overload
■　Warning when electricity insufficiency
■　Cut off the power when electricity use up
■　Pulse output
■　Operation indicated by pulse LED
Optional function: Anti-tamper functio n
The DDSY283 with anti-tamper function has extend terminal cover, anti-tamper
measurement chipset AD7751 instead of AD7755, and have extra one current transformer
except shunt, so there is two measurement loops and the meter will measure energy
consumption correctly even current is reversed, details of four situations as following.
1
2
3
LOAD
4
1
2
3
4
P
N
LOAD
N
P
A ) Load and supply interchange,
1
2
3
P
B) phase and neutral connection interchange
1
4
LOAD
GND
3
4
N
P
N
2
LOAD
GND
C) Load connected with the earth
Earth LED: Load earth LED indicator on
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1
2
3
LOAD
4
1
2
P
3
4
N
LOAD
N
GND
P
GND
D) Load connected with the earth, current reverse
Reverse LED: Current reversal indication on
Earth LED: Load earth indication on
5. Working principles
The meter collects voltage signals from the potentiometer. The current signals collected from
the shunt to get multiplying signals through multiplication device, and after frequency converting, get
counting pulses, which is in direct ratio with the product of voltage and current.
The counting pulses of electric energy will be sent to CPU for processing through
electro-coupling, and be stored in nonvolatile EEPROM after operation. These pulses and information
from IC card that been stored with some volume of electricity and data of supervisory demands will be
processed by micro processing system in the meter then provide signals of display, warning and
cutting-off state etc.
Diagram is as follows:
Ｍｅｍｏｒｙ　Ｕｎｉｔ
Ｅｎｅｒｇｙ　Ｓｉｇｎａｌ
Ｒｅｌａｙ
Ｍａｎａｇｅｍｅｎｔ　Ｓｙｓｔｅｍ
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Ｃ
Ｐ
Ｕ
ＬＣＤ　Ｄｉｓｐｌａｙ
Ｅｎｅｒｇｙ　Ｉｎｐｕｔ／Ｏｕｔｐｕｔ
ＩＣ　Ｃａｒｄ
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１６５
１３７
6. Outline drawing
１１０
６５
８８
7. Connection Diagram
ｐｕｌｓｅ
8. Installation
The meter must be connected according to connection diagram curve in the meter. It is required to
tighten the screws and well connect the conducting plate in the terminal block. For CT operated meter,
the actual volume of electric energy shall be the reading indicated by the meter multiplying the CT
ratio.
9. Guarantee
18 months in case that the meter is sealed and right operation.
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10. Notes for User
1)
2)
3)
4)
5)
6)
7)
One user’s IC card match with one meter only, if the card is lost, the user should buy
renewed card from power supply department.
Users should insert IC card into the slot in the meter before purchasing, in order to
transfer the data of the meter to computer database.
When inserting the user IC card into the meter, the meter will verify the user information
and LCD will display present purchased electricity, total purchased electricity, times of
meter, warning electric ity volume, credit limit, power limit (kW) in sequence.
When the meter is working, the LCD will display remain electricity and total consumption
by turns.
If the "warning LED" illuminate, it means that the user has overload. Power supply will be
switched off automatically if it lasts for 30s, and it will be restored automatically within 3
minutes, or may be manually restored by inserting meter card.
Warning: when remainder electricity volume is less than twice of "warning volume”,
"warning LED" illuminate with an interval of one second, reminding user to purchase
electricity. Please purchase additional credit, or insert card to allow use of all remaining
credit.
Switching-off warning: if remainder electricity volume equals to warning volume, it will
switch off power supply. User can resume it by inserting IC card into slot. If user cannot
find the card when electricity has been switched off, he may borrow neighbor's card and
insert it to resume power supply.
8)
Purchase warning: when remained electricity is less than " warning volume “, warning
LED will last flash.
9)
When remained electricity is zero or negative, it will display " switch off " .The user
should purchase electricity at once.
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