Nilfisk SC800 ST User Manual

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Service Manual: SC750, SC800, SC 750 ST, SC800 ST

Form Number 56043150 Page 105

Brush Disc Remove Feature

The brush disc remove feature spins the brushes and then brings them to an abrupt stop to release the brushes from the

brush plate retaining springs. To accomplish this, a series of events takes place.

Step #1

First the Main Machine Controller checks to make sure that the scrub deck is fully raised, the charger is not plugged in

and that the machine is not moving. If all of this is true, the controller energizes the brush motor contactor to supply

baery posive through its normally open (Closed when energized) contacts to power up the brushes. The brush motor

contactor has a second set of contacts which are normally closed (Open when energized).

Step #2

While the brushes are running, the Main Machine Controller energizes the brush remove relay. This provides a baery

negave connecon to one of the “open when energized” contacts. Since that side of the contactor is open at this me,

nothing changes but the system is “armed” and ready.

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Nilfisk SC800 ST Heavy-Duty Cleaning