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Curtis PMC 1297 Manual
45
at the time the interlock switch is closed. Normal controller operation is
regained by reducing the throttle demand to less than 25%.
KSI-type HPD (Type 2)
To start the vehicle, the controller must receive a KSI input before receiving a
throttle input greater than 25%. Controller operation will be disabled immedi-
ately if throttle demand is greater than 25% at the time KSI is enabled. In this
configuration, if throttle is applied before the interlock switch is closed but after
the KSI input has been enabled, the vehicle will accelerate to the requested speed
as soon as the interlock switch is closed.
SRO
The
static return to off (SRO)
feature prevents the vehicle from being started
when “in gear.” SRO checks the sequencing of the interlock input—or the
interlock input and KSI—relative to a direction input. The 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, controller output is inhibited.
Three types of SRO are available, along with a “no SRO” option. The
programmer is used to make the selection:
Type 0:
no SRO
Type 1:
SRO unless interlock input before a direction input
Type 2:
SRO unless KSI plus interlock input before a direction input
Type 3:
SRO unless KSI plus interlock input before forward direction
input.
If your controller is programmed so that KSI and interlock inputs are both
required (SRO Type 2), the following sequence must be followed to enable the
controller:
STEP
1, turn on KSI;
STEP
2, activate interlock (input “high”); and
then
STEP
3, select a direction. The 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 off either KSI or the
interlock causes the controller to inhibit its output; 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 57) can be used to provide a brief delay before
SRO inhibits controller output, if desired.
3
A
— PROGRAMMABLE TRACTION PARAMETERS: Other (Traction)