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Electricity getting very expensive in the Workshop
awemawson:
--- Quote from: vtsteam on May 13, 2022, 11:51:03 AM ---Maybe Ebay purchases didn't pan out this time? Not that I don't make them myself......
--- End quote ---
Not sure what you're referring to Steve - the Owl monitor (had it for years) and the new genuine Owl sensors and the used ones check out 100% - after all they are only a few turns of copper wire and a split ferrite core in a plastic housing.
. . . may be you were referring to something else :scratch:
vtsteam:
Andrew are they the appropriate senders for that monitor? Does the monitor have internal settings for different model senders/transducers? Do the two used transducers check out?
I have depth sounders that take same brand transducers. BUT, you have to go into settings to change to the model number transducer. I don't own an OWL, so I have no way of knowing, simply asking questions that occur.
awemawson:
The transmitter unit takes in the coil connections from the three phases and Owl seem to only sell two varieties, examples of both of which I have. There is no setting up on the transmitter but as I say the readings seem sensible with other loads.
I'll try it with the Kiln when I go over and feed the pigs in a minute
vtsteam:
Well, as was said earlier, all that power is eventually going into heat. You have a 27 killowatt heater running if somehow this power reading isn't wrong. So are you seeing 92,000 BTU/hr in the vicinity?
awemawson:
Pigs fed and kiln power measured. It's rated or at least plated, at 13.5 kW three phase. From a base load of about 2kW the power used jumped up to 14.4 kW.
So I reckon the Owl monitor, though not calibrated to NPL standards, is giving a pretty fair indication of power used.
Now the machine drives the Mawdsley DC motor using a KDK DC drive with its associated blower cooling. Attached the to KDK drive is a Field Driver that I have actually added a fan to as it's output Thyristor used to run unacceptably hot. The main motor has as I previously mentioned it's own external cooling fan (750 watts NOT 1.5 kW as I had thought).
So energy as heat is being extracted all over the place and yes it does warm the workshop in a nice but expensive way!
I am as puzzled as others regarding the fact that the consumption is so high unloaded - the motor does not over heat by the way.
. . . I think the readings on the Owl monitor are roughly correct
I'll try and get some readings with the Beaver powered up and ready to rock but without the motor spinning - I suspect the various other elements gobble up quite a few electrons.
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