Nilfisk-Advance SC900-28D Service Manual

Contents

18Service Manual – SC900 20 - Wheel System, TractionTroubleshootingThe primary tool for troubleshooting the drive controlleris the Curtis handheld programmer This tool interfaceswith the drive controller to report back error codes,control status, and other functions The Curtis manualwill describe this in greater detail, but the primarytroubleshooting functions are under the Monitor andDiagnostics menusThe diagnostics menu displays a list of either current orpast error codes These are used in conjunction with thetable below to isolate possible causes of malfunctionThe monitor menu displays real-time values of inputs,outputs, and controls This is very helpful for troubleshootingthe drive system’s prerequisite conditions for operation, suchas throttle inputs Additionally, if the brake output isn’tactive, it will cause the scrub system to not functionError CodesBecause most drive system failures will be accompanied by a drive controller error code, troubleshootingis generally error code driven Those few exceptions that would not be error code drive, are covered in theelectrical chapterStatus Led Fault CodesCode Name / Explanation Possible Cause1,1 THERMAL CUTBACKOver/under-temperaturecutback• Temperature >92°C or < -25°C• Excessive load on vehicle• Operation in extreme environments• Electromagnetic brake not releasing1,2 THROTTLE FAULT 1 • Throttle input wire open or shorted• Throttle pot defective• Wrong throttle type selected1,3 SPD LIMIT POT FAULTSpeed limit pot fault• Speed limit pot wire(s) broken or shorted• Broken speed limit pot1,4 LOW BATTERY VOLTAGEBattery voltage too low• Battery voltage <17 volts• Bad connection at battery or controller1,5 OVERVOLTAGEBattery voltage too high• Battery voltage >48 volts• Vehicle operating with charger attached• Intermittent battery connection2,1 MAIN OFF FAULTMain contactor driver Off fault• Main contactor driver failed open