Heating elements - voltage control

[sp0rk]

http://www.stilldragon.com.au/diy-controller-kit/
Still available on his site
Haven't heard a whisper from him on any of the forums I know he vists in a long time, though

 

[jonnir]

I believe he just got the smaller boxed ones back in stock

 

[lukasfab]

thanks gents!

anyone have the pdf wiring diag? not downloading from site

 

[crozdog]

thanks gents!

anyone have the pdf wiring diag? not downloading from site

no problem. View attachment sd controller kit instructions.pdf

simply followed the link...
http://www.stilldragon.org/discussion/271/diy-controller-kit-build-instructions

 

[Dae Tripper]

I might be ruining everyone's fun here but why wouldn't you use the controls from a cooktop or oven. These use 0V switching are cheap and won't need a heatsink. Just my 2c

 

[Maheel]

I might be ruining everyone's fun here but why wouldn't you use the controls from a cooktop or oven. These use 0V switching are cheap and won't need a heatsink. Just my 2c

because they are a thermostat style switch and dont offer any real control

they just turn on and off at a certain temp (cycling)

voltage control allows you to increase the "power" to the element (and heat output) but not turn it off and on (cycling)
this makes it more like GAS fire control to increase or decrease heat output

 

[Dae Tripper]

Well that makes sense, you are after precise control.

 

[booargy]

P=(VxV)/R
the resistance of the element is constant as is the surface area of the element. If you reduce the voltage the power also reduces but the surface area stays the same. therefore the heat density on the elements surface reduces.
PID controllers use a duty cycle say 10 sec at 50% the element is on for 5sec and off for 5sec. A PID controller could be used to drive a motorised pot connected to a SSVR.

 

[DigitalGiraffe]

Dragging up an old thread here sorry.

I'm looking to put something similar to this together (my sparky will) for when I install my 3600w element.

After browsing the mighty eBay for parts I've noticed a whole bunch of differently rated solid state relays and potentiometers. Can anyone advise on what specs should I be looking for?

Would this be suitable? http://www.ebay.com.au/itm/Resistor-Type-Soild-State-Relay-SSR-25VA-25A-24-380V-AC-Heat-Sink-/331734629556?hash=item4d3cecbcb4:g:RygAAOSwXshWsyT8

Cheers!

 

[fraser_john]

Dragging up an old thread here sorry.

I'm looking to put something similar to this together (my sparky will) for when I install my 3600w element.

After browsing the mighty eBay for parts I've noticed a whole bunch of differently rated solid state relays and potentiometers. Can anyone advise on what specs should I be looking for?

Would this be suitable? http://www.ebay.com.au/itm/Resistor-Type-Soild-State-Relay-SSR-25VA-25A-24-380V-AC-Heat-Sink-/331734629556?hash=item4d3cecbcb4:g:RygAAOSwXshWsyT8

Cheers!

I use two of these one for Keg King pump control and another for kettle element control.

 

[barls]

how well does it work on the pump

 

[takai]

I use one of these for voltage control: http://www.ebay.com.au/itm/VolTage-Resistance-Regulator-Solid-State-Relay-SSR-40A-24-380V-AC-w-Heat-SInk-SY-/252308117274?hash=item3abebc571a:g:sn8AAOSwZQxW2K6u

The increased headroom with 40A helps.

 

[Cortez The Killer]

I've got the 10000w model on my 15amp element wired into the 15amp circuit in the spark-o-matic 3000 along with a 15amp ammeter

Seems to work well

http://www.ebay.com.au/itm/10000W-AC-220V-SCR-Voltage-Regulator-Motor-Speed-Controller-Dimmer-Thermostat-/400800508138?

Cheers

Edit: The heat sink is for a SSR on the HERMS circuit

 

[takai]

I've got the 10000w model on my 15amp element wired into the 15amp circuit in the spark-o-matic 3000 along with a 15amp ammeter

Seems to work well

http://www.ebay.com.au/itm/10000W-AC-220V-SCR-Voltage-Regulator-Motor-Speed-Controller-Dimmer-Thermostat-/400800508138?

Cheers

Edit: The heat sink is for a SSR on the HERMS circuit

post-3233-0-92596700-1439857760.jpg

Would be worried if you were kissing that.

 

[hairydog]

I am about to put together a Temp controller because i am lucky enough to acquire a PID controller from work

with a Pt-100 RTD input (temp probe) and a 4-20ma output.I purchased a SSR off ebay-rated at 40amp output a bit of

overkill i know but it will run cooler and handle load easy,Input is 4-20ma, comes from China in a month.This gives me the opportunity

to reduce any offset around set point.SSR was $20.

 

[Cortez The Killer]

Would be worried if you were kissing that.

?

 

[Camo6]

?

Danger! Danger! High Voltage...

 

[Cortez The Killer]

Fire in the disco...

 

[Mardoo]

https://youtu.be/bl6z03A5zRs

 

[takai]

https://www.youtube.com/watch?v=R-FxmoVM7X4

 

[Adr_0]

The solid state voltage regulators shown have 240V on the potentiometer - so make absolutely sure this is grounded correctly. And don't connect one of these to your PID.

SSRs with digital or proportional voltage control have the 240V isolated from the control side, while resistance control has 240V on both sides.