Hardware overview
UM0221
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Figure 2.
Connection diagram of meter
The AC supply is connected to the power supply section of the energy meter. The power
LED glows when the supply is on.
There are two current transformers to measure current in phase and neutral wires
respectively.
The LCD module provides information about the kWh energy consumed, the input supply
voltage, the input current, the power factor as well as the current date and time.
The tamper LED glows if the meter is tampered.
Finally, there is a pulse count LED which glows with a frequency proportional to the
measured power. The proportionality constant can be set by the user.
LCD
CTP
Transformer Phase
Tamper
LED
Pulse
Count LED
Power
LED
Load
Transformer Neutral
CTN
Current
Phase
Mains
Current
AC
Neutral
Red wire
Black wire
Black wire
Red wire
CTN
JP1
