Understanding electricity in the TPU.

[wattsup]

@groundloop

It all happens at the same time.

At relay off only the center contact connects and completes the circuit for both coils in series.

At on, the center relay contact opens and the left relay contact closes and sends the positive to the green coil and the right relay contact closes also and sends the negative to the violet coil.

It is not like the H-Bridge since I am not sending power on the off mode, only connecting the coils together that already are connected on both ends to the power source.

Hope this helps. Thanks a heep for looking at this.

wattsup

[Groundloop]

@wattsup,

Just to make sure, When the center relay is open then both the other two are closed?
(And opposite.)

GL.

[wattsup]

@wattsup,

Just to make sure, When the center relay is open then both the other two are closed?
(And oposite.)

GL.

Yes, that is correct.

When the center is connected (the two other are open) the two coils make one long coil. When it opens, it makes two coils but they need their corresponding polarities reconnected hence the two others close to supply the polarities.

[Groundloop]

@wattsup,

Check your email.

GL.

[giantkiller]

In the last Schematic posted by Wattsup there would be a major difference in circuit operation by selecting relays compared to a soft switch / silicon component.