Phase 6 T3 help

Galwayboy1888

hey guys i have a T3 (PLC Ladder diagram) exam soon and an currently looking to see if anyone has any past papers with soloutions?

currently looking for soloutions to the following:

Dual speed & 1phase motor control via thermistor

Duty cycle pumps

Escalators

any help would be much appriciated as im finding it hard to convert wiring diagram into ladder.

thanks

2011

Post a picture of the ladder diagram as it is now.

I normally set bits for different states and then reset them as required. For example set motor run bit to true when:
1) Motor start request =1
2) and motor stop request not active = 1 (stop switches / EStops are NC)
3) and thermistor relay input = 1 (thermistor healthy / alarm is not active)

Set motor run bit to false when any of the above conditions are no longer met.

Then the motor shall only run when this bit is true.

The slow motor winding output shall only be high for 5 seconds from the leading edge of the run bit becoming active. Once this timer has elapsed and the run bit is still true the fast winding output shall be high.

Does this make sense?

Galwayboy1888

https://imgur.com/tWmTXJX

https://imgur.com/rojj0i5

https://imgur.com/PHCRnwY

https://imgur.com/UBqEzuG

I have these i was given them by someone, but i have been told there are mistakes, can you have a look and see if you think it looks correct?

thanks

Tuco88

I just had a quick look, on the dual speed diagram.

Ladder diagram, output y5 (km1) in the parallel section are you missing the control relay kA1 n/o contact?

I used to do all the parallel parts first on the ladder diagram.