MicroLogic 5.0 x

[POlas1]

Hi everyone,

I'm experiencing an issue with the voltage measurement on my MicroLogic 5.0 X (installed in the MTZ1-10 H1 circuit breaker). The device is showing incorrect voltage readings: U1N is displaying 160V, while U2N and U3N are showing 260V each. However, all the voltages are actually normal at 230V, and the phase angle between the vectors is 120 degrees.

Any insights on what might be causing this discrepancy?

[Manon_Chaboud · Accepted solution]

Hello @POlas1 !

It sounds like there could be a phase sequence issue causing the discrepancy in voltage readings. The phase sequence refers to the order in which the voltage waveforms reach their peak values and is typically denoted as ABC or CBA.

In this case, it's possible that the phase sequence may be incorrect, leading to the unusual voltage readings on U1N, U2N, and U3N. It's important to verify the correct phase sequence at the installation and ensure that it matches the settings in the MicroLogic 5.0 X. Additionally, check for any loose connections or wiring issues that could affect the voltage measurements.

If the phase sequence and connections are correct, and the issue persists, it may be advisable to consult a qualified electrician or Schneider Electric support for further assistance in troubleshooting and resolving the discrepancy.