indago writes:

070704 2133 - Warren Weber posted:

Capacitor start motor. Starts and runs in either direction as it pleases.
Capacitor good (replaced with others as test) 2 windings. Run winding across
line voltage, Start winding across line voltage with capacitor in series.
What determines rotating direction when starting?? This is on a small Delta
9 inch bandsaw. Both windings ohm out OK.

The motor should start and run in only one direction. My first thoughts are
that the starting relay in the motor is either stuck, or the contacts are
dirty. You will probably have to take the end bell off the motor and check
out this relay. It works on a centrifugal principal: as the motor speeds
up, the relay opens and removes the capacitor and start windings from the
circuit.

Slight correction. A capacitor start motor may run in either direction
but the winding used for starting should only start it in one direction
with a given wiring arrangement. This is determined by the placement
of the capacitor and the physical construction of the motor.

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