Issue
The "I calc res" residual current value is not available in the Power Meter module outputs of the ION7400 and PM8000 meters, despite being mentioned "Residual current measurement" in documentation. This measurement is available on ION9000 meters, leading to confusion about its availability across platforms.
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Product Line
Product Models: PM8000, ION7400
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Solution
The ION7400 and PM8000 meters can only calculate residual current in a 4-wire configuration, using vector summation of inputs I1 to I4, with the result represented as I5 (i.e., I1 + I2 + I3 + I4) which is provided by the Power Meter Module’s output register called I5.
This register is also linked to the Data Mapping Meas 1 module, which defines the Modbus data labeled Current G with register number 3008 as described in the device’s Modbus register map, and is reflected on the meter’s display and web interface tagged as I5.
ION9000 includes a physical I5 input for direct residual current measurement where the ION7400 and PM8000 lack this hardware capability.
