Production Description:

The magnetic speed pickup (MPU) is used to detect the speed of the prime mover. It is necessary when the prime mover drives something other than an alternator, and is often used where an alternator is driven directly by the prime mover and when a control signal is necessary before the alternator comes up to its proper output voltage. A speed sensor circuit, either a section on the governor amplifier chassis or a separate unit, is needed to convert the MPU' s output signal to one usable by the governor amplifier.