openinverter forum

Hello - so I placed all the elements on the printed circuit boards and it is time to calibrate the current sensors. From the descriptions on the page: https://openinverter.org/docs/index.htm ... ons,9.html

To calibrate the current, set il1gain and il2gain to 1. Then put a known current through the sensors by winding for example a 1.5mm² cable 10 times through both sensors. Then, using you lab power supply run 5A through your wound cable. Type:

Here I didn’t understand anything, it is possible in more detail how to calibrate current sensors MLX91208.

Oh yes, those instructions need an update. With the Melexis sensors "winding 10 times through both sensors" is no longer possible. So in fact the sensors must be calibrated when mounted onto the target bus bar or cable. Either calibrate them with low current - whatever your lab supply is able to deliver. Or calibrate them during operation using another amp meter as a reference. ilXgain of 2 is a good failsafe default. It will read current higher than it is, ensuring operation of the over current limit.
Does that help?

So they need to be calibrated after final installation on the phase conductor. Selecting the values of il1gain and il2gain leading to the value of the test ammeter - I understand correctly?

Oh, sorry I missed that. Yes.