DDSF-Single-phase Multi-function Multi-rate Energy Meter LCD

General

1. Bidirectional Active Energy Measurement:

· Measures both forward and reverse active energy.

· Reverse energy is accumulated with forward energy but is stored separately.

· Switching between communication, time periods, and active energy directions does not affect pulse accumulation accuracy.

2. Four Rate Tariff Settings:

· Supports four tariff rates (peak, high, normal, and low) with eight time periods.

· Time periods can span midnight.

· Time period states are not affected by power outages or harsh working environments.

3. Energy Storage:

· Stores and measures energy by peak, high, normal, low, total, and reverse totals for each rate.

4. Historical Data Storage:

· Stores the frozen data of the previous 12 months, including peak, high, normal, and low energy.

· Default freeze date is the 1st of every month at 00:00, adjustable to any date from the 1st to the 28th.

5. Backup Battery:

· Uses a needle-welded, green, environmentally friendly lithium battery.

· Backup battery can keep the internal clock running normally for at least 10 years during power outages.

6. Communication Interfaces:

· Programming and meter reading can be done through infrared and RS-485 communication interfaces.

7. Energy Indicators:

· Equipped with active energy indicator light and energy pulse output.

8. LCD Display:

· Displays parameters such as time, date, and energy.

· Scrolling display allows setting of display time and content.

· Energy display has six integer digits and one decimal digit.

· Default setting shows all parameters with each parameter displayed for 5 seconds.

9. Hardware Clock Circuit:

· Built-in clock with calendar, timekeeping, and automatic leap year switching functions.

10. Data Retention:

· All stored data is retained for over 10 years during power outages.

· Energy and pulse count remain unchanged during repeated power outages and restorations.

Specification

l Reference Voltage: 220V

l Reference Current:

· 2.5(10)A

· 5(20)A

· 10(40)A

· 20(80)A

l Reference Frequency: 50Hz

l Accuracy Class: Class 1.0

l Pulse Constant: As marked on the nameplate

l Daily Timing Error: ≤0.5s/d (at 25℃ ±2℃)

l Service Life: ≥10 years

l Battery Capacity: 1200mAh

l Infrared Communication Distance: 5m (with a radiation angle less than 15 degrees)

l RS485 Bus Terminals: 256 terminals, Communication Baud Rate: 2400bps

l Starting Current: Under rated voltage, frequency, and power conditions, the starting current is 0.004Ib

l Creep: When the meter circuit has no current and the voltage applied to the circuit is 115% of the rated value, the output pulse should be no more than one.

Dimension