Nilfisk-Advance SC900-28D Service Manual

Contents

43Service Manual – SC90030 - Solution SystemFunctional DescriptionThe SC900 machine has a 29 5-gallon (112 liter) solution tank incorporated into the main body of themachine. A clear tube on the right side of the machine below the fill cap serves as a water level indicatorfor the tank At the outlet of the solution tank, under the machine, is a manual shutoff valve followed by aserviceable solution filter that prevents debris from entering the rest of the solution system.Non-Detergent ModelsAll machines use gravity feed and a solutionsolenoid to provide solution to the scrub deck Fornon-detergent machines, the flow rate of solutionis controlled mechanically with a cable connectedbetween the solution lever, down to the solutionshutoff valve The solution solenoid is either all-on or all-off, and is controlled by the same circuitthat activates the brush motors A circuit jumperreplaces the connector where the optional EcoFlexcontrol board connects in the solution panelFor the solution circuit to be active, the machinemust be in motion, and the scrub brushes be activeWhen the machine is in motion, the Curtis drivecontroller makes the Brake- output equal to batterynegative This passes through the K1 relay, throughthe brush switch (foot lever), through the jumper(non-EcoFlex), and energizes the solution solenoidThe solution solenoid receives 36-volt, non-PWM(Pulse Width Modulated) power, to be either all-onor all-off BLKPNK/WHTVIOVIO/WHTPNK/BLUVIO/GRNVIOPNKPNKS1SW, SPST KEYS4SW, BRUSHRELAY, LVC123456CURTIS 1228KSI5BRAKE-6BRAKE+14D2K1 RELAY, LVCBATTERY GAUGE WITH HOURMETERFET DRAIN3 B- 4L1COIL, SOLENOID1 2D136 VDC+ -K2COIL, BRUSHK1JUMPER