Results 1 to 3 of 3
Thread: ladder diagram schematic
-
14-03-2010, 05:29 AM #1
ladder diagram schematic
i was told in school to draw a ladder diagram schematic for a domestic refrigerator freezer combination..im guessing its a simple diagram showing defrost timer,heater, and motor im braking my head trying to figure this out can anyone help me out
-
14-03-2010, 08:05 AM #2
Re: ladder diagram schematic
http://en.wikipedia.org/wiki/Refrigeration
Decent starting point, you could add your freezer compartment and controls to the basic diagram.
Did they specify if the f/f had two compressors or one.At the moment there are several types ,simpleist is where the refigerant flows through the freezer compartment first then to the fridge compartment.Thermostat/control would be located in the fridge section so there is no actual exact control of the freezer,it keeps cold because the fridge thermostat will cycle on and as the refrigerant has to flow through the freezer first it stays cold too.
Frost free have a fan in the freezer and blow cold air up to the fridge through vents in the cabinet,this type would have a thermistor in the freezer to control temp via a pcb plus a motorised type flap to control cold air into fridge.
Lots of different types but tthose are a couple of basic ones.
Defrost heaters are controlled by a pcb too but did have a seperate defrost time which simply switched off power to the compressor/motor for around 20 minutes 4 times a day and gave power to a heater which was embedded within the evaporator,control was by thermostatic devices and also a overheat protector was in the circuit which would isolate power to the heater if there were any problems.Last edited by spimps; 14-03-2010 at 08:12 AM.
-
14-03-2010, 10:06 AM #3
- Join Date
- Sep 2007
- Location
- Split Croatia
- Age
- 57
- Posts
- 6,151
- Blog Entries
- 6
- Rep Power
- 36
Re: ladder diagram schematic
Ladder diagrams are used to describe the logic of electrical control systems.
http://www.seattlerobotics.org/Encod...97/ladder1.htm
Also it should be drawn to some standard and I recomend ISO
http://lhc-proj-qawg.web.cern.ch/lhc...lity/QA403.pdf
Best way to do that is by some software which will keep you within standard so that anyone could understand your drawings.
http://www.control.com/thread/1026216941Last edited by nike123; 14-03-2010 at 10:20 AM.
Similar Threads
-
York HICA 600 A51 wiring diagram
By RickSter in forum Air ConditioningReplies: 2Last Post: 06-05-2010, 01:23 AM -
Piping and Ladder Diagram
By potatohead in forum Tools and CalculatorsReplies: 1Last Post: 12-03-2010, 08:40 AM -
Refrigeratiion pipes and components diagram needed!
By nike123 in forum CommercialReplies: 3Last Post: 21-06-2009, 09:48 PM -
Pool heat pump water side diagram
By nike123 in forum Heat PumpsReplies: 23Last Post: 22-03-2009, 07:42 PM -
NH3/H2O Absorption cycle on log(p)-h diagram
By MatiZaidman in forum FundamentalsReplies: 0Last Post: 27-09-2008, 08:42 AM