A process signal in the range 0-10VDC is input to the controller. The controller compares the input signal against a high setpoint and a low setpoint. If the input is below the low setpoint, a relay output energises. If the input is between the low and high setpoint, the relay is de-energised. If the input is greater than the high setpoint, the relay energises.
The response of the relay should be time delayed (between 0 and 5 seconds) to prevent temporary changes in the input affecting the output.
I would have to program the controller so that the setpoints and time delay could be adjusted from the front panel using a LCD display.
Oh - if you insist on using a sledgehammer to crack a nut then the Mitsi is the most straightforward. I've no experience with the IDEC but its name sounds much more like what you need....
Thanks, but I don't really want a setpoint controller. The dedicated product I require is a trip amplifier with user-adjustable setpoints and response time.
I'd still have a look at process controllers - you may find that someone does what you want without any programming (plenty of industrial processes out there that work in a similar way, and they don't wany Joe operator messing about with a PLC....)
Yeah, I tried to post the same thread to more than one group in Google Groups ("separate multiple groups with commas") but it didn't work for me. Don't know if you have to have a space either side of the comma or something...
So I had to rewrite my post and put it in sci.electronics.design
Another one for your list is the Crouzet Millennium range. I have used these - both their mains and 24V volt range for various control projects including domestic (heating, lights, ventilation etc). Very easy to program. I don't have any specific info on the performance of the ADC (only available on the 24V version) but their UK office are very helpful with advice. see
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