ATM90E32 and ATM90E36 CT Configuration

The IPEM, IoT Power Energy Monitor board, has been designed to provide compatibility for either an ATM90E32 or ATM90E36 Energy Metering device, as highlighted below for the forth CT input. CT1, CT2 and CT3 remain the same for both devices.

• ATM90E3x Options
  • ATM90E32 Energy Monitor
    • 3 x Phases Line CT Clamp Input
      • Example YHDC SCT013000
    • 1 x Phase CT Clamp Input (To ESP32 ADC)
      • Example YHDC SCT013000
    • 3 x Voltage Inputs (AC RMS)
  • ATM90E36 Energy Monitor
    • 3 x Phases Line CT Clamp Input
      • Example YHDC SCT013000
    • 1 x Phase Neutral CT Clamp
    • Example YHDC SCT013000
    • 3 x Voltage Inputs (AC RMS)

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Whilst the PCB itself remains consistent between the two variants, we need to make alterations to the solder jumpers and ideally a minor tweak to the RC network.

ATM90E32

• R27 and R28 = 10K
• R19 and R20 = 0R
• C9 = 10u

ATM90E36

• R27 and R28 = 1K
• R19 and R20 = 2R4
• C9 = 18n