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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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[OT]: Refridgeration compressor question...
I picked up a small fridge compressor with the idea of playing around using
it for a vacuum pick up tool for small electronics parts, but it behaves strangely. On initial power up it runs fine, very quietly. It quickly/easily pulls down to 20kpa (-80kPa). However if I disconnect the power and reconnect there is a quiet hum like the motor is stalled (motor is not running & there is no airflow). If I disconnect again then wait a minute or two before reconnecting it powers on fine and will run fine - I've let it run for 5 minutes continuously with no problems. As part of the terminals to the motor there appears to be a thermal overload switch, it gets warm but not hot (my guess ~30 Celius) Heres a link to the data sheet: http://www.transtech-co.jp/electroni...ompressor7.pdf I vaguely recall something about fridges having protection against rapid cycling of the power for some reason - but that could be rubbish. If there is some sort of anti-short cycle timer it must be inside the compressor housing itself. Any ideas? Thanks. |
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