["Followup-To:" header set to sci.electronics.design.]
On 2005-11-11, Esther & Fester Bestertester wrote:
Thus spake :

You have 2 issues. Foiust, is the motor supposed to be running on 230
or 208? That couild be the extra current.
If the motor is really exceeding the nameplate amps I would
investigate futher.

Nameplate: 230V, 16.5A.

frequency? what mechanical load is it driving?

I presume that if an autotransformer boosts the voltage
10%, it must draw 10%(?) more current in order to do so. Is
this correct? (Nothing is free.)
FBt

yeah 10% more voltage out than in means 10% more current in than
out (+ losses).

--

Bye.
Jasen

["Followup-To:" header set to sci.electronics.design.]
On 2005-11-13, Esther & Fester Bestertester wrote:
Thus spake Jasen Betts:

Nameplate: 230V, 16.5A.

frequency? what mechanical load is it driving?

60hz. 4hp cap. start motor driving 2-stage compressor,
light duty cycle (20-25%).

Try a smaller pulley on the motor (or larger on the compressor)

That'll increase the duty cycle but reduce the load on the motor
(and thefore the current it draws)

--

Bye.
Jasen