Curtis 1243GEN2 Manual
75
7 — DIAGNOSTICS & TROUBLESHOOTING
FAULT OUTPUT LED DIAGNOSTICS
The 1243GEN2 controller provides two fault outputs designed to transmit fault
information to LEDs located on the display panel or on any remote panel. These
outputs can be programmed to display faults in Fault Code format or in Fault
Category format—see Section 3, page 51.
In Fault Code format, the two fault outputs operate independently. The
Fault 1 line flashes the same codes, at the same time, as the controller’s built-in
Status LED (see Table 8). The Fault 2 line pulls low when a fault is present; it
can be used to drive an 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 9. When a fault occurs, the Fault 1 and
Fault 2 lines (Pins 2 and 3) 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 outputs return to their normal state (i.e., HIGH/HIGH).
Table 9 FAULT CATEGORY CODES
FAULT 1 FAULT 2 FAULT
OUTPUT OUTPUT CATEGORY POSSIBLE FAULT
HIGH HIGH 0 (no known faults)
LOW HIGH 1 Current shunt fault
Hardware failsafe fault
M- shorted
Throttle wiper high or low
Emergency reverse wiring fault
Field winding open
Contactor coil or field shorted
Main contactor welded or missing
HIGH LOW 2 Low battery voltage
Overvoltage
Thermal cutback, due to over/under temp
LOW LOW 3 Anti-tiedown fault
High pedal disable (HPD) fault
Static return to off (SRO) fault
Service timer or disable timer expired
Motor too hot
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