Nilfisk-Advance CS7000 Fuel Cell EcoFlex, Service Manual

Page: 250 / 440

250 Service Manual – CS7000
Hopper System
Functional Description
Overview
The hopper system holds the dirt, dust and debris swept up by the brooms. The hydraulic lift cylinder raises
the hopper to allow the accumulated dirt and debris to be dumped into a suitable receptacle, then lowers
the hopper back down into the normal operating position. The hopper lift cylinder is powered by a separate
hydraulic power pack that includes an electric motor and hydraulic pump. Two double pole contactors
control the lift cylinder direction by reversing the polarity to the pump motor.
The hopper dump door, driven by an electric actuator, can be opened by pressing the hopper door open
button when the hopper is up to empty the hopper. Proximity sensors limit the hopper dump door actuator
travel by signaling to the main machine controller that the end of travel has been reached. The controller
then turns off the actuator motor. Note that the hopper door opens automatically to receive the dirt and
debris from the brooms when the hopper is in the operating position and the sweep system is enabled. Once
the sweep system is switched off, the hopper door closes. An interlock prevents the hopper door from being
opened manually if the hopper is down.
The hopper interlock proximity sensor signals the A1 Main Machine Controller when the hopper is closed.