need propper electrical (design) engineer

[chrislandy]

Chaps,

I've got a small project on the go and I need speak to a propper electrical controls engineer for some advice/assistance (preferably gratis as it's for a uni project)

Thanks
Chris

[Dixie]

What control system?

Siemans, Allen Bradley other?

Are we talking PLC or print cards, ladder logic or other?

I have a few engineers, need to know what you want before I decide which engineer.

M

[chrislandy]

I'm building an oven, I have seen a controller that I think will do the job as I need programable temperature ramp rate, dwell period and cooling cycles (some with ramp, dwell, ramp, dwell, cool) etc but I need some advice on thermisters/thermocouples, heater elements and how to wire the thing up! The oven needs to heat to around 200degC max (70-120typ), a typical example of a cycle could be something like: ramp @2deg/min to 70deg, dwell-1hr, ramp @ 2deg/min to 120deg, dwell 3hrs, cool@1deg/min OR ramp 2deg/min to 80deg, dwell for 12hrs, cool 1deg/min

The controller I've seen is a CAL 9900 (used) but I had a look around Farnell and saw some others that seem to log and control via computer.

Thanks
chris

[chrislandy]

bit of an update, planning 2 oven sizes approx 1200x1200x800 and 2400x1200x800 internal dims, with 100mm of dense packed glass insulation

was looking at 1 or 2 of these as the heating element: http://uk.rs-online.com/web/p/ceramic-h ... s/7241716/ with solid state 20A 240v AC relays

Could someone PM me their email address so I can send a circuit sketch for comment?

thanks
Chris.