Wesley BCT-6200-6SA - Manual (Page 49)

Curtis 1243
GEN
2 Manual, Rev. B 41
3 — PROGRAMMABLE PARAMETERS: Sequencing Fault Parameters
ANTI-TIEDOWN
The anti-tiedown feature prevents operators from taping or “tying down” the
mode select switches in order to operate permanently in Mode 2 or Mode 4
(which are typically the higher speed modes). Each time the interlock switch
closes, the anti-tiedown feature checks which mode is selected. If the mode select
switches are requesting Mode 2 or Mode 4 (Mode Select 1 switch closed), the
controller will default to Mode 1 or Mode 3, depending on the position of the
Mode Select 2 switch, and an anti-tiedown fault will be declared. The controller
will then remain in Mode 1 or Mode 3 until the Mode Select 1 switch is released
and reactivated. The anti-tiedown feature can be programmed On or Off.
HPD
The high pedal disable (HPD) feature prevents the vehicle from driving if
greater than 25% throttle is already applied upon startup. In addition to pro-
viding routine smooth starts, HPD also prevents accidental sudden starts if
problems in the throttle linkage (e.g., bent parts, broken return spring) give a
throttle input signal to the controller even with the throttle released.
HPD requires the controller to receive a KSI input and an interlock in-
put (HPD Type 1)—or simply a KSI input (HPD Type 2)—before receiving
a throttle input greater than 25%; if the inputs are not received in the proper
sequence, the controller will inhibit output to the motor. An HPD fault can
be cleared by reducing the throttle demand to less than 25%.
HPD fault detection can be turned off by setting the HPD Type to 0. To
meet EEC requirements, HPD must be programmed to Type 1 or Type 2.
Note: The conditions for HPD faults are not affected by whether the
main contactor interlock parameter is On or Off.
HPD Type 0 : No HPD fault detection
HPD Type 1 : KSI+interlock
To drive the vehicle, the controller must receive both a KSI input and an in-
terlock input before receiving a >25% throttle input. Any other sequence will
result in an HPD fault that will prevent the vehicle from being driven.
With HPD Type 1, the sequencing delay parameter can be used to pre-
vent HPD faults that would otherwise occur from momentary opening of the
interlock switch while driving (see Figure 14, page 29). If the interlock switch
is opened and then quickly closed before the programmed sequencing delay
elapses, no HPD fault will be declared and operation will not be interrupted.
HPD Type 2 : KSI only
To drive the vehicle, the controller must receive a KSI input before receiving
a throttle input greater than 25%. Violation of this sequence will result in an
HPD fault that will prevent the vehicle from being driven. With HPD Type 2,
Sequencing Fault Parameters