Three Phase Keypad Token Prepaid Electricity Meter  - Code "EEDTP"

1- LCD display

2- LED indicators. From left to right are: kWh, kvarh, status credit, alarm, comm.

3- Nameplate. Contain meter basic parameters and specification

4- Up and Down button with display

5- Optical communication port, for local data reading and parameter setting

6- Keypad, contain 0~9 numeric buttons, “ ← ”button and“ ↵ ”button, for TOKEN enter and data query

7- Programming enable Key

8- Assistance terminal. Pulse ports (active and reactive energy), open meter box detection port

General Description

EEDTP is a three phase multi-function digital STS token prepayment meter. Customers purchase electricty in advance to get the 20 digits “TOKEN”, after entering the token into prepayment meter by keypad on the meter. The credit will be generated immediately. Comparing to WiFi and GPRS meter, it's more convenient and widely used. No requirements of cloud server, WiFi and GPRS signal coverage.

EEDTP meter is Three phase four wire keypad prepaid electronic energy meter, It is designed, manufactured,test strictly by the requirements of IEC62055-41, IEC62053-21, IEC62056-21 and other relevant international standards.

Main Specification

Basic Features

1.1  Measure active energy

Measure active energy: Total= import + export

1.2  Measure total active energy

Total active energy is the sum of 3 phases active energy, W+ = |WA| + |WB| + |WC|

1.3  Measure average power

Measure each phase and total phase average power. The average power is the mean of each minute instantaneous power, can be used for load controlling. The minimum unit for active power is 0.0001kW.

1.4  Build-in relay for load controlling

Relay open when remaining energy to be 0, user should purchase the energy to resume the power supply. (When remaining energy is bigger than 0, relay close automatically)

1.5  Increment function

Upon acceptance of a valid TOKEN, meter shall credit the exact amount contained on the TOKEN to the appropriate register in the meter and will increment the register by this amount

1.6  Low remain energy alarm

This meter have 3 levels of remaining energy alarm limit to remind user purchase energy:

When remaining energy is more than alarm limit1, LED alarm indicator will be green and long lighted.

When remaining energy is less or equal to alarm limit 1, and more than alarm limit 2, LED alarm indicator will be green and glitter.

When remaining energy is less or equal to alarm limit 2, and more than alarm limit 3, LED alarm indicator

will be red and long lighted

When remaining energy is less or equal to alarm limit 3, LED alarm indicator will be red and glitter.

When remaining energy run out, relay open. User should purchase the energy (remaining energy is bigger than 0) to close the relay.

1.7  Over power limit alarm and trip

Relay open automatically when any phase exceeded the power limit, at the same time, LCD alarm symbol will be flashed. According to the binary code on LCD, we can track out the alarm reason. Overload relay open delay time and relay close delay time is programmable.

If power limit is not defined or bigger than 69kW, or set as 0, for devices or equipment safety purpose, we

regard the power limit is “3 times* IMAX * rate voltage”, this is a format of default power limit.

1.8  MPPUL alarm

Meter measure each phase average power. If the maximum phase deducts the minimum one exceeded the power unbalance limit, LCD alarm symbol will be flashed. According to the binary code on LCD, we can track out the alarm reason. Alarm will disappear when phase power unbalance value within the limit. Phase power unbalance limit is programmable.

1.9  Relay error alarm

Meter monitor relay work status continuously, to confirm if the relay worked as per MCU order. If find some problem on relay, LCD alarm symbol will be flashed. According to the binary code on LCD, we can track out the alarm reason. If no problem, no alarm symbol flash.

1.10  Terminal cover or meter box open alarm and trip

Unauthorized terminal cover or meter box open will trigger an event log  be recorded in non-volatile memory with date and time tamp. At the same time, meter trip and LCD alarm symbol flash. According to the binary code on LCD, we can track out the alarm reason.

1.10.1   Unauthorized terminal cover or meter box open will trigger an event log, no matter of meter at power on state or at the power off state.

1.10.2  When meter at installation model, open terminal cover or meter box will not trigger an event log.

Remark: Event logs generation and relay open action are related to KT, but alarm is not related to KT

1.11  Billing function

Bill date can be set at any date between 1st  and 28th. Default billing time is on each month 1st  day at 0 o’clock, can store last 12 months data, details as below:

1.  Cumulative total consumption energy(import/export, active)

2.  Cumulative total purchased energy

3.  Active max demand

4.  Monthly energy consumption (energy consumption in one month)

1.12  Payment cumulative function

1.12.1  When meter at prepaid model, it will deduct the remaining energy during running, relay open when remaining energy run out. Meter will calculate the total consumption energy and prepaid total consumption energy.

1.12.2  When meter at the postpaid model, it don’t deduct the remaining energy, and relay don’t open when

remaining  energy  is  0.  Meter  will  calculate  total  consumption  energy  and postpaid  total  consumption energy.

Noted: Prepaid model and postpaid model is optional

1.13  Power off display

1.13.1   Open terminal cover and meter box detection. If the terminal cover or meter box is well placed previously, open terminal cover or meter box will trigger an event log with date and time stamp. Meanwhile, LCD will show a SIGN, later relay will open.

1.13.2   Press the “   ” key, LCD will show software revision, remaining energy, prepaid total consumption,

postpaid total consumption by sequence. Later LCD display shut off.

1.14  Max demand

This meter can calculate and store the forward active maximum demand by each billing intervals, as well as the max demand occurrence time.

The default demand period is 15 minutes, slide interval is 1 minute.

Demand period and slide interval is programmable via local communication port, both of them should be set smaller than 60 minutes, and the demand period should be the integral multiple of slide interval.

1.15  Installation model and running model

4.15.1   Meter after inspection and testing, out-factory to be installation model. Customer can enter a series code (TOKEN) “12682136550811111930” to transfer the meter from installation model to running model. Or meter continue using more than 168 hours, meter will auto-switching from installation model to

run model.

4.15.2   Installation model: Open terminal cover or meter box, will not trigger alarm and relay open. It is more human-friendly when do meter installation and testing

4.15.3  Running model: Meter can detect terminal cover and meter box open.

2.    LCD display and LED indicator

2.1  Full-screen display

3.    Keypad operation

Keypad has 12 buttons to enter TOKEN and query information. “ ← ”button is delete key, “ ↵ ”button is confirm key.

User get a 20 digits TOKEN from vending station, enter the TOKEN into meter, meter will decrypt this TOKEN and finish energy transferring. During keypad operation, the backlight will be lighted and the digits willshow on the LCD. Maximum 8 digits per each screen, so total need 3 screens to display the full TOKEN. If entered incorrect digit, press the “ ← ” key can be deleted. When finish TOKEN entering, press “↵ ” key to confirm to complete energy transferring. If no operation within 30 seconds, the meter will return to cycle display model automatically, turn off the backlight.

4.    Prepayment

When purchase energy, vending station will issue an encrypted 20 digits TOKEN to user.

After finished this 20 digits TOKEN into meter, you can press the “↵ ” key to confirm. If this is a valid TOKEN, the meter will execute the command, show information of “good” and ☺ on the LCD, and beep “di” “di” twice, prompt the operation successfully. If the TOKEN is invalid, the meter will not accept this TOKEN, some information like as "Used" or "Reject" or "Expired" and ☹ will come out on the LCD main display area. Meanwhile, the corresponding error code will show on the lower-left of   LCD, and beep “di” “di” “di” three times, prompts the operation fail.

Keypad lock-out function: have 2 kinds of keypad lock-out, one is local keypad lock-out, the other is remote keypad lock-out. If entered an invalid TOKEN, keypad lock-out period will be double of TOKEN entering times (2*N). If continue entering an invalid TOKEN more than 5 times, the keypad lock-out period will be extended to 20 multiples of TOKEN entering times (20*(N-5)), the maximum keypad lock out period is 120S.During the keypad lock-out period, test TOKEN is available, but not accept the credit TOKEN and clear TOKEN, user can use the keypad to do manual query operation.