Control Panel for 3ph Heaters

[Darkwood]

If you dont get sorted b4 weekend il draft you up a simplified wiring format that you can follow, dont worry about not understanding them yet you pick it up along the way but if its an interest you'd be good to get a beginners guide to control wiring and schematics just understanding the schematics helps you plan your own wiring better as you are constantly looking at examples.

 

[jparker86]

If you dont get sorted b4 weekend il draft you up a simplified wiring format that you can follow, dont worry about not understanding them yet you pick it up along the way but if its an interest you'd be good to get a beginners guide to control wiring and schematics just understanding the schematics helps you plan your own wiring better as you are constantly looking at examples.

That would be a great help. I have today gone and got another contactor but still problem is once stop circuit is interrupted the thing won't work again. Shall I have a go at doing another drawing for you ?

 

[plugsandsparks]

OK, try this way, have you numbered the panel wires ?
if so simply list each wire you have in the panel. If not have a go at listing all the wires but its easier to explain what to change if they are numbered

So example

wire 1 - from emergency stop to 110V rail
wire 2 emergency stop to push button (start)

ect ect

include the power wiring and all control wiring.

Maybe we can then say " move wire 3 from a to b... etc

sorry for assumptions - no offence meant

 

[Darkwood]

Have the start stop button pulling in a main contactor then from one of its poles send the supply out to a switch (on/off) which in turn goes to the stat then the switch wire from the stat to the contactor coil for the heater..... this is pretty much what Tony's diagram shows then repeat for 2nd heater.
I assume your problem is your controlling the same contactor with both a start/stop button and stat control and you stat control is acting as a stop command dropping out the retained contactor, this is why you need a independant contactor just for the start/stop command so it remains energised until either Estop or stop is pressed.

 

[jparker86]

Have the start stop button pulling in a main contactor then from one of its poles send the supply out to a switch (on/off) which in turn goes to the stat then the switch wire from the stat to the contactor coil for the heater..... this is pretty much what Tony's diagram shows then repeat for 2nd heater.
I assume your problem is your controlling the same contactor with both a start/stop button and stat control and you stat control is acting as a stop command dropping out the retained contactor, this is why you need a independant contactor just for the start/stop command so it remains energised until either Estop or stop is pressed.

Thanks gents for sticking with me on this one. I know it's annoying talking to someone like me who aint got the first clue but I am not going to let this beat me!
Here is my new drawing which hopfully you can see a bit better. This is just one button, the last drawing had all three but they are all identical in how they work.

 

[jparker86]

Have the start stop button pulling in a main contactor then from one of its poles send the supply out to a switch (on/off) which in turn goes to the stat then the switch wire from the stat to the contactor coil for the heater..... this is pretty much what Tony's diagram shows then repeat for 2nd heater.
I assume your problem is your controlling the same contactor with both a start/stop button and stat control and you stat control is acting as a stop command dropping out the retained contactor, this is why you need a independant contactor just for the start/stop command so it remains energised until either Estop or stop is pressed.

Darkwood, yes this is exactly what I need to do. I have this here which I think will do what you are saying, is this what I need?

 

[Darkwood]

its beer time for me, il also explain about E-stops as yours wouldn't comply il see how far youve got by weekend.

 

[jparker86]

Darkwood would what I took a picture of do the job?

 

[Alot Isaiah]

i think you have a great idea there. why not try it perhaps it will work.using a thermostat to control another contactor is possible since the thermostat is a sensor.

 

[Swicade]

jparker 86....refer back to post #13 kindly donated by Tony as that is spot on. Only thing i'll add is afew more bits to the key offered:-

K1/1 = N/O contact on pump contactor (K1)
Sw1 = Rotary on/off switch for Heater bank 1 contactor (K2)
Sw2 = Rotary on/off switch for Heater bank 2 contactor (K3)
Th1 = Thermostat on Heater bank 1
Th2 = Thermostat on Heater bank 2

Definitely rotary switches on heater bank circuits instead of push buttons.

It may help if you copy/draw out Tony's donation on paper to help you understand the circuit better.