On 2009-03-04, Jim Stewart wrote:
Ignoramus16649 wrote:
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".

I'm no expert, but I think I'd do it by looking
up the full-load and locked rotor current draw
of the motor and setting the overload current
somewhere in between.

The adjusting knobs do not have current written on them.


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