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Messages - sandwich

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Technical support / Re:VFD to PLC
« on: February 08, 2009, 11:37:16 AM »
A typical installation has the plc sending a 120 volt run signal. The vfd then returns a 120 volt signal back to confirm that its running. So you need one input and one output.

The drive can be programmed for speed, ramp up time, etc. You can change the speed using the vfd display or a remote speed pot.

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General Discussions / Re:Measuring temperature
« on: November 20, 2008, 09:42:51 PM »

I was skeptical but if you use thermocouple wire and simply put a small amount of solder at the junction it works perfect! They've been using it for years where I work and it always passes yearly calibration.

Can't get much cheaper then wire.

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