50Service Manual – SC6000 20 - Wheel System, TractionOperational Mode PrerequisitesBefore the main controller can activate any of the operational modes, it must first check that the appropriateprerequisites are met• Drive Controller outputs– Drive wheel motor◦ No “interlock” message from the main controller on the CAN bus (only active during auto disc brushinstall mode)TroubleshootingDrive Controller (E4) Error CodesThe drive controller error codes will be displayed on the main display However, the error number is alsoflashed on the two-color status LED on the module itself. The status LED has 2 colors; red and yellow. Thered LED will flash out which digit of the code is coming next, and the yellow LED will flash out the value ofthat digitFor example, to flash out an M4 Overload error with a code of 034, the red LED will flash once, followed bythe yellow LED flashing 3 times. Then the red LED will flash twice, followed by the yellow LED flashing 4timesCode Description Comments3-001 E4 Timeout This error is generated by the main machine controller when the drivecontroller fails to communicate when expected.3-012 Control Overcurrent The output phase current exceeded permissible limits. Check the phaseconnections to the motor for shorts.3-013 Current Sensor The internal current sensors have an invalid reading. Troubleshoot the motorfor shorts in the windings or power leads.3-014 Precharge Fail The capacitor bank failed to charge to KSI voltage. The K3 relay will not bepermitted to close.• Check the KSI relay for loose connections or voltage drop.3-015 Severe UnderTemp The controller’s internal temp is below -40°C. The controller will be disabled.3-016 Severe OverTemp The controller’s internal temp is above 95°C. The controller will be disabled.3-017 Severe UnderVolt The capacitor bank voltage dropped below the preset limit. The drive willreduce power to the motor.3-018 Severe OverVolt The capacitor bank voltage exceeded the preset limit. The drive will bedisabled.3-022 OverTemp Cutback The internal temperature exceeded 85°C. The output power will be reduced.3-023 UnderVolt Cutback The capacitor bank voltage dropped below the under voltage limit. The outputpower will be reduced. This may happen if the batteries are depleted.3-024 OverVolt Cutback The capacitor bank voltage exceeded limits during regenerative braking.3-025 +5V Fault The 5 volt supply is out of range. Likely due to excessive load.3-028 Motor Hot Cutback The wheel motor temperature is above the setpoint. The output will bereduced.3-029 Motor Temp Sensor The motor temperature thermistor is showing either 0 or 10 volts. Temperaturenot available, drive torque reduced.3-031 K3 Coil Fault The K3 relay coil is either opened or shorted.