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VRV II has 3 connectilns on its compressor ...U,V, W
The replacement compressor has 4 connections: U, V, W and ...N
N is connected in the starpoint of the compressor
Why do they need an extrenal connection in the starpoint? Heating via pulsating DC current on 1 winding to heat up sump?
Someone told me it was to help measure compressor rpm, not sure it that's true...
Not sure if it was for heating as only seen belt heaters on them.
It is a feedback signal to the electronics to indicate motor position
IPM detects rotor position by reverse Elecro Mooving Forсe created by permanent magnets mooving near "empty" stator coil. Isn't it?Quote:
Originally Posted by frank