| Re: [GMCnet] Roof A/C out at 104F (of course) [message #317943 is a reply to message #317899] |
Tue, 23 May 2017 20:08   |
Jim Miller
Messages: 501
Registered: March 2008
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On May 23, 2017, at 8:51 AM, Johnny Bridges via Gmclist wrote:
> Overspeed will result in overvoltage, which will toast equipment if it's much over, and over frequency which will help toas electric motors.
Overspeed results in an over-frequency condition that is linearly proportional to the amount of overspeed but the excitation system has a limiting device - the thyristor - which puts an upper bound on excitation and thus an upper bound on output voltage. It is this device which prevents output voltage from soaring in a no-load situation but it also serves to limit maximum output voltage in any operational circumstance.
Many motors will tolerate an over-frequency condition but may draw increased current or deliver decreased speed due to flux saturation of their magnetic components. I have regularly operated 60Hz rated motors at 80Hz in CNC positioning applications but each motor design has differing magnetic characteristics so this statement cannot be extrapolated to the A/C compressor and fan.
Did the OP ever report back as to whether the A/C restarted after the short-cycle lockout timer expired?
—Jim
1977 Eleganza
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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