Bogus current readings

[devin122]

Testing out my new install. When the dryer kicks on it causes all channels to read >150A. Removing one of the CTs and setting the channel to 240 causes everything to settle back down. Is this expected behavior? I'm assuming the issue has something to do with saturating the ADC, and the solution is to upgrade to larger CTs.


PS: Using a micro-40, and load appears to be ~30A

[ben]

Testing out my new install. When the dryer kicks on it causes all channels to read >150A. Removing one of the CTs and setting the channel to 240 causes everything to settle back down. Is this expected behavior? I'm assuming the issue has something to do with saturating the ADC, and the solution is to upgrade to larger CTs.


PS: Using a micro-40, and load appears to be ~30A

You have a Micro-40 hooked up like a Split-CT it looks like. The Splits have built-in burden resistors, the Micros use an on-board burden.

The consequence is all channels become overloaded when the circuit comes on.

Just change your dryer CTs to use Ports 2,3 instead or 1,2 or 3,4.