Over current protective circuit with time delay for a floor clea

Details Over current protective circuit with time delay for a floor clea Over current protective circuit with time delay for a floor clea

1995-04-24

1997-12-16

Wysocki, Jonathan

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 31, H02P 700

Patent

active

056989571

ABSTRACT:
A protective circuit controls the operation of a floor cleaning machine provided with a brush motor and a vacuum motor. The protective circuit disables the vacuum motor when an operator starts the brush motor and then restarts the vacuum motor provided it was previously running. The floor cleaning machine is also provided with provisions for adjusting the action of the brush and thus changing the load current of the brush motor. The load current of the brush motor is continuously compared to a first level overload current and an indicator alerts the operator to a first level overload condition allowing a predetermined time for the load current to be reduced by adjusting the brush. If the load current is not reduced, then the brush motor is de-energized. If a second level overload condition of the brush motor occurs at any time, the brush motor is de-energized immediately.

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