PZKW108 wrote:
flash7210 wrote:
The electric fan has two windings.
Activate any one winding and you get low speed.
Activate both windings and you get high speed.
So both winding are activated thru both relay at the same time , High and low.?
One relay is called high and the other low, but really it doesn't matter, and for bench testing you need to energize both.
Relay A energizes Winding A, which we will call low.
Relay B energizes Winding B, which we will call high.
Turn on A only and you get low speed.
Turn on B only and you get low speed.
Turn on A and B and you get high speed.
A = 1, then Fan = Low
B = 1, then Fan = Low
A OR B = 1 then Fan = Low.
A AND B = 1 then Fan = High.
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