Dean B

[Dean B]

BLDC motors take DC and use electronic commutator convert that into AC

[Dean B]

well it would affect your voltage drop reading if you measure voltage drop across a bldc because you’re measuring the inverter right? And is it correct for me to assume that most BLDC motors on a refrigerator should have 3-4 lines? If the schematic doesn’t label them lines, how do i determine which are which?

[Dean B]

Thanks Sam. Will we go into more details about refrigerator schematic reading later in the course? I really need that. Thanks

[Dean B]

Got it. A refrigerant vapor with high boiling point won’t do no good inside a evaporator coil.

[Dean B]

The condenser fan is there to cool down the refrigerant inside the condenser coil to condensate the refrigerant vapor.

[Dean B]

I watched it. Woudn’t a weak compressor not pumping enough refrigerant be the cause of a partially frosted evap coil? I don’t get why a condenser fan would be the problem here. Thanks

[Dean B]

How could a condenser fan cause partially frosted coil?

[Dean B]

OK I got it now. Thanks

[Dean B]

No the board was still supplying power to the board but it kept on sending voltage to the motor.

[Dean B]

It’s 120vac voltage drop. ok so he was measuring the voltage drop across the damper. The damper got its power supply from the control board correct? If there was no power going to the damper it would have shown 0, right? Or how does the damper get its power from?

[Dean B]

My meter will read 60vac all across B1.

[Dean B]

Are we measuring voltage drop or resistance? In this case, voltage drop of B1 is 60vac and B2 is also 60vac. Total circuit resistance is the total resistance of b1+b2.

[Dean B]

Can you compare this damper circuit to a light bolt connected to L1 and N? Or is this case different? Sorry im very confused i thought i got the basics down.

[Dean B]

Sorry i don’t quite understand the entire situation here. Can you explain more in details? I thought if the switch was closed it should have shown 0vac? If the circuit has been open, it was supposed to show 120v? This is ac so it should get L1 and N.

[Dean B]

If the damper motor was on all the time, shouldn’t the meter show 0v meaning continuity? why 120v?

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