Regarding the installatoin of the HDPM6000 head unit(single phase)

[Tomohiro-Okada]

Hi,

I use the HDPM6000 head unit in split (2-phase) mode. In this setup, I originally wired the main CTs as follows:

Main CT for phase R → 1A (black), 1A (white)
Main CT for phase N → 1N (black), 1N (white)
Main CT for phase T → 1B (black), 1B (white)

However, the Phase N current did not appear in PME. I then rewired the main CT for phase N to 1C (black), 1C (white), and the Phase N current appeared.

Therefore, my understanding is that when using the HDPM6000 head unit in split (2-phase) mode, the main CTs must be wired as follows:

Main CT for phase R → 1A (black), 1A (white)
Main CT for phase N → 1C (black), 1C (white)
Main CT for phase T → 1B (black), 1B (white)

Is this correct?

Regards,

Okada

[Mehran_Mehrnia]

Hi @Tomohiro-Okada 

In split mode, only two phases and a neutral are defined, so a third phase (Phase C) does not apply.

Depending on whether the current inputs for Phase 1, Phase 2, and Neutral are wired, the neutral current is either measured or calculated.

What does the webpage display for head unit(PQM) when the CTs are connected as below?
Main CT for phase R → 1A (black), 1A (white)
Main CT for phase N → 1N (black), 1N (white)
Main CT for phase T → 1B (black), 1B (white)

Best Regards,

-Mehran

L3 Expert Advanced metering

[Mehran_Mehrnia]

Hi @Tomohiro-Okada 

Just to add some notes and provide clarification following my previous comments, after reaching out to the HDPM6000 team.

As explained above, in Split Mode, only two phases should be defined, and using phase C is incorrect.

Regarding the neutral current, the meter only measures it when a third CT is installed on the neutral conductor and connected to the neutral channel, which requires additional channels. Otherwise, the meter does not calculate neutral current as the vector summation of I1 and I2.

As previously mentioned, first, please check the current values on the meter’s webpage under the PQM tab. If the values are present there but not in PME, it is likely related to the meter’s driver and the associated Modbus registers that PME uses to poll values.

In this case, the PME team would be the best point of contact to provide further assistance through the EcoStruxure Power Monitoring Expert forum.

Best Regards,

-Mehran

L3 Expert Advanced metering