7—DIAGNOSTIC & TROUBLESHOOTING
 

                                                    DIAGNOSTIC AND TROUBLESHOOTING

The 1212 and 1212P controllers provide 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 by the status LED.                                   

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 faults history file is recommended each time the vehicle is brought in for maintenance. Refer to the troubleshooting chart (Table 3) for suggestions about possible causes of the various                                             faults. For information on programming devices, see Appendix D.

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 2-digit fault identification code continuously until the fault is corrected. For example, code “1,4”—undervoltage—appears as:  

The fault codes are listed in Table 2. Refer to the troubleshooting chart (Table 3) for suggestions about possible causes of the various faults.
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
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.

Curtis 1212/1212P Manual, Rev. c                                                                                                                                                               37

7—DIAGNOSTIC & TROUBLESHOOTING

8—MAINTENANCE

8                    MAINTENANCE
There are no user serviceable parts in Curtis 1212/1212P controllers. No attempt should be made to open, or otherwise modify the controller. Doing so may damage the controller and will void the warranty. However, it is recommended that the controller's fault history file be checked and cleared periodically, as part of routine vehicle maintenance.

DIAGNOSTIC HISTORY
The handheld programmer can be used to access the controller's fault history file. The programmer will read out all the faults that the controller has experienced since the last time the history file was cleared. The faults may be intermittent faults, faults caused by loose wires, or faults caused by operator habits or by overloading.
After a problem has been diagnosed and corrected, clearing the history file is advisable. This allows the controller to accumulate a new file of faults. By checking the new history file at a later date, you can readily determine whether the problem was indeed completely fixed.

*Jack up vehicle and retest to confirm diagnosis. Clean connection, inspect system wiring, and retest.

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