The DTSYF1791 three-phase electronic prepaid multi rate electricity meter (hereinafter referred to as the "instrument") is designed and manufactured based on the actual electricity consumption of residents. It has high accuracy and reliability.

This instrument adopts a dedicated chip for energy metering, designed in combination with mature multi rate and prepaid technologies, and is a high-tech product manufactured using 16 bit digital sampling processing technology and SMT process. The key components are selected from internationally renowned long-life devices, which improves the reliability and service life of the product. The data display adopts a large screen LCD, which is convenient for meter reading.

This instrument can realize functions such as time-sharing metering prepayment, setting daily meter reading, handheld computer programming, and meter reading; Can set 2 time zones, 3 rates, and 12 day time slots; And it has infrared and 485 communication functions, which can achieve long-distance meter reading. The communication protocol can support DL/T 645-2007 "Multi functional Energy Meter Communication Protocol", providing necessary conditions for electricity automation management.

Its performance indicators comply with the technical requirements for electronic active energy meters in GB/T 17215-2002 "Level 1 and Level 2 Static AC Active Energy Meters", meet the technical requirements for multi rate energy meters in GB/T15284-2002 "Special Requirements for Multi rate Energy Meters", and comply with various technical requirements of GB/T18460-2001 "IC Card Prepaid Electricity Sales System".

2、 Main functions

Prepaid multi rate energy meters have the following basic functions:

3.1 Time based active and reverse energy measurement, reactive energy measurement, can be divided into 4 rates, 12 time periods, and 8 time zones.

3.3 Infrared communication, programming settings, and meter reading can be performed through a handheld computer.

3.4 Parameter rotation display can be implemented, and the parameters (not exceeding 32 items) and time intervals of the rotation display can be pre-set. The order of parameter rotation display can also be set arbitrarily.

3.5 Equipped with optocoupler isolation active passive pulse output interface, with the same pulse constant as the meter constant.

3.6 Record the total active power and hourly power for 12 months, and meter reading can be done through infrared or 485 methods.

3.7 It has programming prohibition function and data reset function.

3.8 Support for reduced meter reading according to departmental regulations.

3.9 It has the function of purchasing electricity first and then using it, and automatically freezing the monthly electricity consumption rates on designated meter reading days.

3.10 IC card can be used for parameter setting and meter reading.

3.11 adopts a one table one card method, with multiple verifications and encryption of data in the IC card, ensuring security and reliability.

3.12 Each time electricity is purchased, data is transmitted bidirectionally through the power card.

3.13 Can set non working hours and emergency credit limits.

3.14 Within the rated current range, the maximum operating power can be limited (by the power supply department).

3.15 has an external alarm output interface.

3.16 has built-in sound and light alarm, trip and power-off functions

a. When overloaded, it is possible to control the output of alarm and trip signals by selecting whether to allow alarm tripping.

b. When the remaining power is less than or equal to the alarm set value, the alarm and trip signals can be controlled by selecting whether the meter is allowed to output alarm and trip signals.

c. When the remaining power is zero, the meter outputs a trip signal.

7、 Programming instructions

7.01 Programming allowed. The authorized person opens the programming switch button of the electric energy meter (completed by transmitting signals through an IC card), and the programming symbols are displayed on the LCD screen. The electric energy meter is in the programming state, and at this time, the handheld computer can communicate with the electric energy meter to complete the programming settings.

7.02 Data reset. If the energy meter is in the zeroing allowed state, use the zeroing card to reset all internal electricity data and historical record data of the meter. After resetting, the electricity meter displays: E=00。

7.03 Programming is prohibited. After the programming of the energy meter is completed (through signal transmission via IC card), press the programming switch button once, and the programming symbol on the LCD display screen disappears. At this time, the energy meter is in a programming disabled state, and the internal parameters of the energy meter can only be read out, not modified. Only electricity meters within the specified error range can be calibrated.

Note: In order to prevent unauthorized personnel from operating the programming switch after it is turned on, a 10 minute allowed programming time is specially set in the meter. When the time exceeds, the meter will automatically disable programming.

7.04 Table Number and Factory Number: The identification number for communication between the handheld computer and the energy meter. When reading or setting up meters, it is necessary to input the meter number or factory number of the energy meter in order for the handheld computer to communicate with the energy meter normally. The meter number can also be assigned to the user's account through the purchase of a power card. The table number of the table can be obtained by pressing the read button to view the content of item "3.1B". The factory number is assigned when the electricity meter leaves the factory and printed on the meter nameplate.

7.05 Rotation Time: The display time of each data item during rotation, with a default rotation time of 4 seconds.