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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Adjusting an overload properly
I have been cleaning up this Quincy install by properly tucking cables
into conduits, wiring things correctly, using crimped terminals where appropriate, etc. My Quincy compressor comes with a nice old Size 2 electrical control. The nice thing about it is that overloads are adjustable by turning little knobs, so I do not have to buy overload heaters. At 220v, it is rated at up to 15 HP. The motor I have on the compressor right now, is 10 HP. The compressor was wired for 440 volts originally and had a 7.5 HP motor (much bigger than my current 10 HP motor). So the overload setting that it had set, obviously would not match. For for the first few weeks I did not use overloads by bypassing them, but now I want to set them properly. The question is what is "properly". My thinking is that in this context, it means that the compressor can reliably restart at the restarting pressure (100 PSI or so), but at the same time, overloads should pop in a second or so if the motor is stalled. I can reproduce a stalled motor very easily, by stopping the compressor when there is pressure in the tank, and restarting within a minute, before unloaders bleed enough air. (I hope that it is not an indication that something is wrong with unloaders, a separate topic) I already set the overloads, apparently high enough so that they do not pop when the motor is running regularly. So, therefore, to me the procedure now would be to turn them down, to the point when they reliably pop on a stalled motor, but when compressor still starts well. Am I missing something and is that too unscientific? -- Due to extreme spam originating from Google Groups, and their inattention to spammers, I and many others block all articles originating from Google Groups. If you want your postings to be seen by more readers you will need to find a different means of posting on Usenet. http://improve-usenet.org/ |
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