Nilfisk-Advance Convertamatic 24 Service Manual

Also see for BA 625: Instructions for use Instructions for use

Contents

Nilfisk-Advance Convertamatic 24 Service Manual Manual pdf 22 page image

20 - FORM NO. 56043098 - Convertamatic ™ 24, 26, 28, 32 / BA 625, 725, 825SCRUB SYSTEMFUNCTIONAL OVERVIEW• Disc Brush System OverviewSee Figure 2. The machine models Convertamatic™ 24D, 26D, 28D, 32D / BA 625, 725, 825 use the disc type scrub system powered by (2) 1/2 hp motor gearboxassemblies.• Cylindrical Brush System OverviewSee Figure 4. The machine models Convertamatic™ 24C, 26C, 28C / BA 725Cuse two cylindrical brushes that counter rotate to sweep up light debris and scrub atthe same time. Each scrub brush is powered on opposing ends by 1/2 HP permanent magnet motors attached to separate poly-V belt/pulley drives.• General Brush OverviewNote: Recovery Tank Full switch must be closed (Tank empty). On all models the scrub deck platform is raised & lowered automatically by a vertically mountedelectric lift actuator motor. The operation of the machine’s scrub functions are activated when the operator selects (presses) the scrub on (mode) panel button. Thescrub pad or brush pressure ranges (1-3) are selectable allowing the operator the choice to vary the scrubbing effort (pressure) while operating the machine. Note:See the Main Control Board Special Program Options section in this manual for more detailed operation and instructions to change scrub pressure settings.See Figure 1. The machine’s main scrub system input and output operating functions are regulated (managed) by the display panel and combined main controlboard A1. The major scrub system functions are…• M2 / M3 - Scrub Brush Motor Run FunctionCircuit Overview Scrub Brush Motor+ (Positive) Circuit input starts with:• A closed S3 key switch supplies the needed positive voltage to the K1 brush solenoid coil and the A1 control board #J1-13 (Brn wire). Note: The A1 controlboard scrub-on button must also be depressed (enabled). This operator command lowers the brush deck.Once the K1 load is closed the needed Positive voltage is supplied to the motors M2 and M3.from battery Pos.- (Negative) Circuit input starts with:• A battery negative ground input at the A1 control board terminals B2 (J1-9) Blk and B1 (J1-7) Blk.• Note: The A1 control board scrub-on button must also be depressed (enabled).• A negative voltage output from the A2 speed controller’s Neg. (pin #6) Red/Blk wire to the A1 control board Red/Blk wire (terminal J1-5). Note: The A2 speedcontrol brake output (neg.) (pin #6) occurs whenever the R1 direction throttle pot is moved off its neutral setting.• A negative voltage output from the A1 board’s terminal (J1-14) Vio/Blk wire completes the K1 solenoid coil circuit (Pos. & Neg.) and pulls in the load contactmaking the brush motors run.The Neg. M2 and M3 load voltage is supplied from the battery Neg.• M5 - Scrub Brush Actuator Lift Motor FunctionThe A1 control board outputs a controlled motor voltage polarity change (wires J2-1 and J2-8) that raises and lowers the scrub-deck for installing, removing andcontrolling the scrub brushes’ selected current load. The large BLK negative (-) scrub brush motor wire is specially designed so that it has a known (specified)resistance value. As brush motor current passes through the negative wire that is, in effect, a low value resistor, a small voltage drop is developed across it whichis proportional to the motor current. This voltage change is inputted to the A1 control board at J2-5 and J1-7(sense wires WHT/GRA & BLK). Any surroundingtemperature change in this large Neg. motor wire affects its resistance so the temperature is sensed by a thermistor (*) built into the control board A1. This allowsthe controller to provide error correction for the temperature resistance changes. When the controller senses a current draw out of the desired range it automaticallyturns on the M5 actuator motor to raise or lower the scrub deck. This process is on going in maintaining the operator’s selected scrub motor current load setting tosustain the desired brush working pressure.• Scrub System Low Voltage Cut-Out FunctionThe purpose of the special low battery voltage cutout function is to help prolong battery life. The scrub deck will be raised and the brush motors and solution solenoidvalve will turn OFF automatically and cease to function when the batteries discharge to the selected cutout level. The cutout level is adjustable between two settings.The standard setting (wet cell/lead acid) is 1.72 volts per cell and alternate setting (gel/maintenance free) is 1.81 volts per cell. Note: See the battery system sectionfor instructions for selecting (setting) the two different thresholds.SPECIAL SCRUB SYSTEM FUNCTIONS• Scrub Brush Removal Function (Disc only)For removal of the scrub brushes automatically, the scrub deck must be in the up position and the drive system in neutral. To remove the scrub brushes simplydepress the control panel scrub-off button (H) for 2-3 seconds. The A1 control board will momentarily run the brush motors and then stop them quickly, where thebrushes inertia causes the brushes to easily spin off of the scrub brush motors drive caps.revised 5/07