1. DDSY/U1877 single phase smart prepaid meter with DIN Rail installation. There are several
advantages in this meter such as small dimension for easy installation, NB-IOT/GPRS/WiFi three different
communication mode for more choice for different using environment, built-in relay which can trip when
over load, balance run out, and so on. And there are more functions in our AMI system such as remote
control, remote recharge, remote reading, remote clear balance and so on functions.
2. Features
2.1 Measurement: single phase active energy(both forward and reverse energy), class1.
2.2: Prepayment: first recharge then using, meter will cut off power when balance run out.
2.3: Built-in relay: meter(relay) will open automatically when balance off or over power limit,
manual close relay through AMI system remotely.
2.4: Alarm: LED will fast flash when balance is less than 10kWh.
2.5: Communication: 3different communication modem for choosing, NB-IoT and GPRS mode
are from China mobile. WiFi modem works like mobile phone, as soon as access wifi network,
meter can communicate with AMI system immediately.
2.6: Display: display real time parameters, meter ID, signal intensity, network connection status, see
below details.
2.7: Friendly overdraft: meter will cut off power(relay open)automatically when balance off, the
administrator can turn on through AMI system, or press the meter button more than 5seconds
to temporary overdraft 20kWh(user can do this function too), while this function can be used only
one time, after using the overdraft 20kWh, user can only recharge to close meter relay.
2.8: overload protection: The relay will open when overload lasts for 30 seconds and close after 60
seconds. If the above situation happens for more than 5 times in 30 minutes, the relay will open
30minutes, this function will recover after 30minutes.
2.9. data storage: the meter has nonvolatile storage, the energy record is kept forever, it will not lose
when power off or network off.
3.Technology data: