Curtis 1244 Manual, Rev. E
75
FAULT OUTPUT DRIVERS
e 1244 controller provides two fault output drivers designed for use with a
display to provide fault information to the operator. e fault output drivers,
Fault 1 (Pin 5) and Fault 2 (Pin 6), are open collector drivers rated at 10 mA
maximum current at the nominal battery voltage. ey are intended to drive
display LEDs but can be used to drive anything that operates within the drivers’
limits. ese outputs can be configured to display faults in Fault Code format
or Fault Category format—see Section 3, page 42.
In Fault Code format, the two fault outputs operate independently. e
Fault 1 line ashes the same codes, at the same time, as the controller’s built-
in Status LED (see Table 6). is line can therefore be used to drive an LED
located on the display panel in order to provide fault code information directly
to the operator. e Fault 2 line pulls to ground (B-) when a fault is present;
it can be used to drive a remote LED that simply indicates whether or not
there is a fault. When no faults are present, both of the fault lines are in their
normal state (high).
In Fault Category format, the two fault outputs together define one
of four fault categories, as listed in Table 7. When a fault occurs, the Fault 1
and Fault 2 lines (Pins 5 and 6) go to the state indicating the category of the
particular fault:
LOw/HIGH, HIGH/LOw, or LOw/LOw. When the fault is cleared, the
fault ouputs return to their normal state (i.e.,
HIGH/HIGH).
Table 7 FAULT CATEGORy CODES
FAULT 1 FAULT 2 FAULT
DRIVER DRIVER CATEGORY POSSIBLE FAULT
HIGH HIGH 0 (no known faults)
LOw HIGH 1 Hardware failsafe fault
M-, current sensor, or motor fault
Throttle fault
Emergency reverse wiring fault
Contactor or output driver fault
Precharge fault
HIGH LOw 2 Low battery voltage
Overvoltage
Thermal cutback, due to over/under temp
LOw LOw 3 Static return to off (SRO) fault
High pedal disable (HPD) fault
Anti-tiedown fault
8 — DIAGNOSTICS & TROUBLESHOOTING
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