Wesley BC-6200-8SA - Manual (Page 53)

Curtis 1268 Manual, Rev. D
47
6 — DIAGNOSTICS & TROUBLESHOOTING
6
DIAGNOSTICS AND TROUBLESHOOTING
The 1268 controller provides diagnostics information to assist technicians in
troubleshooting drive system problems. This information is displayed on the
handheld programmer (or PC Programming Station), and it is also available in
the form of fault codes issued by the controller’s built-in Status LED and the
optional remote LED driven by the controller’s external LED output. Refer
to the troubleshooting chart for suggestions covering a wide range of possible
faults.
PROGRAMMER DIAGNOSTICS
The programmer presents complete diagnostic information in plain language.
Faults are displayed in the Faults menu (see column 2 in the troubleshoot-
ing chart), and the status of the controller inputs/outputs is displayed in the
Monitor Menu.
Accessing the Fault History menu provides a list of the faults that have
occurred since the fault history file was last cleared. Checking (and clearing)
the fault history file is recommended each time the vehicle is brought in for
maintenance.
The following 4-step process is recommended for diagnosing and trouble-
shooting an inoperative vehicle: (1) visually inspect the vehicle for obvious
problems; (2) diagnose the problem, using the programmer; (3) test the circuitry
with the programmer; and (4) correct the problem. Repeat the last three steps
as necessary until the vehicle is operational.
Example: A vehicle that does not operate in “forward” is brought in
for repair.
step 1: Examine the vehicle and its wiring for any obvious problems,
such as broken wires or loose connections.
step 2: Connect the programmer, select the Faults menu, and read
the displayed fault information. In this example, the display shows
“No Known Faults,” indicating that the controller has not detected
any problems.
step 3: Select the Monitor menu, and observe the status of the inputs
and outputs in the forward direction. In this example, the display
shows that the forward switch did not close when “forward” was
selected, which means the problem is either in the forward switch
or the switch wiring.
step 4: Check or replace the forward switch and wiring and repeat
the test. If the programmer shows the forward switch closing and
the vehicle now drives normally, the problem has been corrected.