A-4
Curtis 1207B Manual
2 9 J U N E 2 0 1 2
D R A F T
APPENDIX A: GLOSSARY
Fault recovery
(including recovery from disable)
Almost all faults require a cycling of the KSI or brake input to reset the con-
troller and enable operation.
The only exceptions are these:
fault
recovery
anti-tiedown
release and re-select Mode 1
emergency reverse
BB re-applied or brake cycled
HPD
lower throttle to below HPD threshold
overvoltage
when battery voltage drops below overvoltage
SRO
when proper sequence is followed
thermal cutback
when temperature comes within range
throttle fault 1
clears when condition gone
undervoltage
when battery voltage rises above undervoltage
High-pedal-disable (HPD)
Th
e HPD feature prevents the vehicle from being started while the throttle
is applied. The controller can be programmed to have HPD based on either
brake input or KSI.
Brake-type HPD
To start the vehicle, the controller must receive a brake input (brake released)
before receiving a throttle input. Controller operation will be disabled imme-
diately if pedal demand (throttle input) is greater than 25% duty factor at the
time the brake is released (brake input “high”). Normal controller operation is
regained by reducing the throttle demand to less than 25%.
Sequencing delay, which can be set with the handheld programmer, provides
a variable delay before disabling the controller. If the brake is applied while the
throttle is above the HPD threshold (25%), HPD is not activated if the brake
is then released before the delay time elapses.
KSI-type HPD
The HPD feature can be activated by KSI input instead of brake input, if
preferred. To start the vehicle, the controller must receive a KSI input before
receiving a throttle input.
KSI
KSI (Key Switch Input) provides power to the logic board, and initializes and
starts diagnostics. In combination with the brake input, KSI enables all logic
functions.
Some vehicles may have no keyswitch (KSI simply tied to B+) or may have
the key permanently turned on.
