42
Curtis 1244 Manual, Rev. E
than HPD reshold at the time the direction switch is closed or is changed
while driving. Normal controller operation is regained by reducing the throttle
demand to less than HPD reshold.
hPD ThREShOLD
e HPD threshold parameter denes the maximum throttle allowed at startup.
If throttle is greater than this threshold at startup, an HPD fault is issued. is
parameter has a default setting of 25%, and is programmable from 0 to 25%.
SRO
e static return to o (SRO) feature prevents the vehicle from being started
when “in gear.” SRO checks the sequencing of the interlock input—or the in-
terlock input and KSI—relative to a direction input. e interlock input—or
the interlock plus KSI inputs—must come on before a direction is selected.
If a direction is selected before or simultaneously (within 50 msec) with the
interlock input, the controller is disabled.
ree types of SRO are available (along with a “no SRO” option):
Type 0: no SRO
Type 1: SRO on interlock input plus a direction input
Type 2: SRO on KSI plus interlock input plus a direction input
Type 3: SRO on KSI plus interlock input plus forward direction input.
If your controller is programmed so that both KSI and interlock inputs
are required (SRO Type “2”), the following sequence must be followed to enable
the controller: 1, turn on KSI; 2, activate interlock (input “high”);
and then 3, select a direction. e interval between steps 1 and 2 is the
same as between steps 2 and 3; that is, KSI input must precede interlock input
by at least 50 msec. Once the controller is operational, turning o either KSI
or the interlock causes the controller to turn o; re-enabling the controller
requires the 3-step sequence.
Similarly, if your controller is programmed so that KSI, interlock, and
forward inputs are all required (SRO Type “3”), they must be provided in that
sequence in order to enable the controller. Note, however, that operation is
allowed if a reverse input precedes the interlock input; this can be useful when
operating a walkie on ramps.
Sequencing delay (see page 47) can be used to provide a variable delay
before disabling the controller, if desired.
FAULT CODE
e 1244 controller’s fault code drivers allow faults to be displayed in either of
two dierent formats: Fault Code format or Fault Category format.
3 — PROGRAMMABLE PARAMETERS: Fault Parameters
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