The most widely accepted speed changing device for the PAM Motor
is the oil-filled, five pole, motor-operated speed-changing switch.
It is typically installed close to the motor to minimize cable
requirements. There are six leads (three for each speed) from
the switch to the motor.
The PAM Motor is usually started on its lower speed winding to
keep the inrush current low. This prolongs motor life by keeping
rotor and core temperature excursions to a minimum. Starting on
the lower speed is also more desirable for driven equipment considerations.
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