Kerenza

[Kerenza]

Last question, those Cams, when they aren’t activated, are they creating any connections between contacts at all or not? I meant, are they like regular switches that have NO or NC setting.

For example, on the schematic Cam 14 is drawn as if it’s connecting T23 and T22 by default. But I assume in my “second Pump-Spin cycle in Regular wash” scenario Cam 14 is not creating any contacts. Because if it is, it seems like when the Pressure Switch is in the Empty position once the water is all drained out, there would be current flowing through the Temp Switch and Water Valve.

[Kerenza]

Awesome! Thanks, Sam! 🙂

[Kerenza]

Not sure why the attached images don’t show up correctly. I need to learn how to do it. But anyway, these are the links for the Timing Chart and Schematic that I marked up. Please let me know. Thanks.

Timing Chart: https://ibb.co/kJhGxbv

Schematic: https://ibb.co/1dTzW5f

[Kerenza]

Hi, I’m also trying to really understand and get a good grasp of this timing chart and how current flows when certain cams are activated and contacts are made.

I attached pics of the timing chart and schematic from Module 5 Unit 5 that have my markups. If we only focus on the 8 minutes of the second Pump-Spin cycle in the Regular wash cycle (I highlighted this in a yellow box or highlight on the Timing Chart), is my interpretation of how the Neutral and L1 go on the Schematic correct if we include all of the Cams that are activated during that period of time?

So in that instance the loads that are working are the Motor (Start & High), Pump and Timer Motor. The Water Valve would be off and the Pressure Switch and Temp Switch are bypassed.

[Kerenza]

Arrgh, never mind my question, again :S I was going over my notes to prep for the final exam and didn’t see the part that comes up next saying that ovens use RTD sensors not PTC Thermistors. Sorry, I wish I can delete the post but I couldn’t.

[Kerenza]

Got it now. Thanks for the help, Sam. Much appreciated!

[Kerenza]

Hmm, actually, after seeing my own drawing, I realized that I’m wrong by saying that the Heater and Resistor are in parallel. :S

The resistor and the controls are in parallel, but not with the heater, right? My bad.

But going forward with this, is it still correct though to just add both the resistance values of the heater and resistor like they’re in series since in the earlier module/unit we learned about equivalent resistance in parallel circuits?

[Kerenza]

Strip Chart

I guess the pic above didn’t upload correctly. So here’s a link to it.

[Kerenza]

Hi Sam, thanks for the explanation. Yes, I do understand that if I only follow the lines from 1M to OR, then I have to pass through both the heater and resistor that are in series with each other when the TM-OR contacts are closed. However, how about the control branch to the left of it?

I’ve included a picture or strip chart of what I think or assume what the circuit looks like around that area. That’s why I thought the heater and resistor are in parallel, but please let me know if I’m wrong thinking this way. Thanks.

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