Variable Frequency Drive for a larger factory fan

[chy_farm]

But on the way of assembling I found this handmade case was a tad small, so added some more rooms ;



Main power board with magnetic contactor and a transformer;


Placed a noise filter right after the main contactor;


Temperature sensors are placed onto five different part,
1: Bridge diode (50A),
2: Short cut unit,
3: Isolated Gate Bipolar Transistor unit,
4: High speed diodes for return current re-circulation unit,
5: Double 2mH filter coils right before the output terminal;


Output frequency monitor;


Output current monitor, and its detector (HAS-50);




Chy