74
Curtis 1244 Manual, Rev. E
8 — DIAGNOSTICS & TROUBLESHOOTING
LED DIAGNOSTICS
A Status LED is built into the 1244 controller. It is visible through a window
in the label on top of the controller. is Status LED displays fault codes when
there is a problem with the controller or with the inputs to the controller. During
normal operation, with no faults present, the Status LED ashes steadily on and
o. If the controller detects a fault, a 2-digit fault identification code is ashed
continuously until the fault is corrected. For example, code “3,2”—welded
main contactor—appears as:
¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤
( 3 , 2 ) ( 3 , 2 ) ( 3 , 2 )
e codes are listed in Table 6.
Table 6 STATUS LED FAULT CODES
LED CODES EXPLANATION
LED o no power or defective controller
solid on controller or microprocessor fault
0,1
■
¤ controller operational; no faults
1,1 ¤ ¤ [not used]
1,2 ¤ ¤¤ hardware failsafe fault
1,3 ¤ ¤¤¤ M-, current sensor, or motor fault
1,4 ¤ ¤¤¤¤ [not used]
2,1 ¤¤ ¤ throttle fault
2,2 ¤¤ ¤¤ static return to o (SRO) fault
2,3 ¤¤ ¤¤¤ high pedal disable (HPD) fault
2,4 ¤¤ ¤¤¤¤ emergency reverse circuit check fault
3,1 ¤¤¤ ¤ contactor driver overcurrent
3,2 ¤¤¤ ¤¤ welded main contactor
3,3 ¤¤¤ ¤¤¤ precharge fault
3,4 ¤¤¤ ¤¤¤¤ missing contactor, or main cont. did not close
4,1 ¤¤¤¤ ¤ low battery voltage
4,2 ¤¤¤¤ ¤¤ overvoltage
4,3 ¤¤¤¤ ¤¤¤ thermal cutback, due to over/under temp.
4,4 ¤¤¤¤ ¤¤¤¤ anti-tiedown fault
Note: Only one fault is indicated at a time, and faults are not queued up. Refer
to the troubleshooting chart (Table 5) for suggestions about possible causes of
the various faults.
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