3.2.2 Diagnostics and Troubleshooting
When faults happen, try to restart by resetting the key switch after confirmed that faults are not caused by faulty
wiring connection or mechanical failure. If the faults are still on, shut down the key, check for incorrect
connection or corruption of the pin 35 connecter, reconnect after repaired and cleared, and then restart again.
The controller provides diagnostics information to assist technicians in troubleshooting drive system problems.
The diagnostics information can be obtained in two ways: by reading the appropriate display on the programmer
or by observing the fault codes issued by the status LED.
Led Diagnostics
During normal operation, with no faults present, the status LED is steadily on. If the controller detects a fault, the
status LED flashes a fault identification code continuously until the fault is corrected. Refer to the
troubleshooting chart for suggestions about possible causes of the various faults. Faults are listed
alphabetically.
Note: The status LED can only indicate one fault at a time. If multiple faults are detected, the highest priority
fault code flashes until it is cleared.
Programmer Diagnostics
The programming devices present complete diagnostic information in plain language. Faults are displayed in
the Faults/Diagnostics menu, and the status of the controller inputs/outputs is displayed in the Monitor menu.
Additionally, the fault history file in the Faults/Diagnostics menu provides a list of the faults that have occurred
since the file was last cleared. Checking (and clearing) the fault history file is recommended each time the
vehicle is brought in for maintenance.
Refer to the troubleshooting chart for suggestions about possible causes of the various faults. Faults are listed
alphabetically.
Fault Handling
When a fault is detected, the controller operates in a manner that is safe in the presence of that fault. Depending
on the severity of the fault, the response can range from reduction of current to complete shutdown of drive. The
status LED uses a 2-digit code. For example, code “1,4”—undervoltage—appears as:
¤ ¤¤¤¤ ¤ ¤¤¤¤ ¤ ¤¤¤¤
（1,4） （1,4） （1,4）
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