Nilfisk-Advance R 253 9087362020 Service Manual

Contents

Electrical System54Service Manual – Scrubtec R 253 - RA40Electrical SystemFunctional DescriptionThe batteries (2 x 12V) are connected together in se-ries by the cablesThe battery charger (CH) is connected to the machineby two connectors (C) (power connection to the batter-ies) and C3 (4-way signal connection)The grey and white cables (1 and 2 of connector C3)are short circuited inside the battery charger (CH)when this is not connected to the electrical mains Ifthis connection is not made, all machine functions aredisabledIf the optional battery charger has not been installed,the relevant bridge must be used on connector C3The “bridge” is installed at the function board J4 lo-cation as shown in a photo belowJ4 bridge connectorThe green cable (terminal 4 of connector C3) is thedata cable between electronic board (EB1) and bat-tery charger (CH)This connection allows the battery charger chargingcurve to the be set directly from the machine dash-board and to view the operational state of the batterycharger during charging directly on the dashboarddisplayBattery ChargerWhen the battery charger (CH) is connected to thepower supply, it provides a + 24V on J4 2: in this con-dition the electronic board (EB1) disables all the con-trol and functions except the battery status indicatoron the display electronic board (EB4)Battery Charge State DisplayLow voltage cut outThe Function electronic board shuts off electrical loads to protect the batteries from damage caused by overdischargingThe voltage threshold where loads are turned off depends on the battery type See table below(Significant levels for machine operation)INDICATION TRANSITION THRESHOLD (VOLT) CONSEQUENCEWET GEL1 22V 22.2V Little remaining run time, no block.2 20.4V 21.6V Brush OFF3 19.4V 20.6V Vacuum system OFF4 18.4V 19.6V Drive system OFFhttps://harrissupplyind.com - To Order Parts Call 608-268-8080