18Service Manual – SC900 20 - Wheel System, Traction
Troubleshooting
The primary tool for troubleshooting the drive controller
is the Curtis handheld programmer. This tool interfaces
with the drive controller to report back error codes,
control status, and other functions. The Curtis manual
will describe this in greater detail, but the primary
troubleshooting functions are under the Monitor and
Diagnostics menus.
The diagnostics menu displays a list of either current or
past error codes. These are used in conjunction with the
table below to isolate possible causes of malfunction.
The monitor menu displays real-time values of inputs,
outputs, and controls. This is very helpful for troubleshooting
the drive system’s prerequisite conditions for operation, such
as throttle inputs. Additionally, if the brake output isn’t
active, it will cause the scrub system to not function.
Error Codes
Because most drive system failures will be accompanied by a drive controller error code, troubleshooting
is generally error code driven. Those few exceptions that would not be error code drive, are covered in the
electrical chapter.
Status Led Fault Codes
Code Name / Explanation Possible Cause
1,1
THERMAL CUTBACK
Over/under-temperature
cutback
• Temperature >92°C or < -25°C
• Excessive load on vehicle
• Operation in extreme environments
• Electromagnetic brake not releasing
1,2
THROTTLE FAULT 1
• Throttle input wire open or shorted
• Throttle pot defective
• Wrong throttle type selected
1,3
SPD LIMIT POT FAULT
Speed limit pot fault
• Speed limit pot wire(s) broken or shorted
• Broken speed limit pot
1,4
LOW BATTERY VOLTAGE
Battery voltage too low
• Battery voltage <17 volts
• Bad connection at battery or controller
1,5
OVERVOLTAGE
Battery voltage too high
• Battery voltage >48 volts
• Vehicle operating with charger attached
• Intermittent battery connection
2,1
MAIN OFF FAULT
Main contactor driver Off fault
• Main contactor driver failed open
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