Specifications

Curtis PMC 1223/33, 1225/35, 1227/37 Manual
A-5
APPENDIX A: GLOSSARY
Fault recording
Fault events are recorded in the controller’s memory. Multiple occurrences of the
same fault are recorded as one occurrence.
The fault event list can be loaded into the programmer for readout. The
Special Diagnostics mode provides access to the controller’s diagnostic history
file—the entire fault event list created since the diagnostic history file was last
cleared. The Diagnostics mode, on the other hand, provides information about
only the currently active faults.
Fault recovery (including recovery from disable)
Almost all faults require a cycling of the keyswitch (or power enable switch, if used)
to reset the controller and enable operation. The only exceptions are these:
FAULT RECOVERY
BB wiring clears when fault is corrected
HPD lower throttle to below HPD threshold
overvoltage when battery voltage drops below overvoltage
SRO when proper sequence is followed
thermal cutback when temperature changes
throttle fault clears when condition is gone
undervoltage when battery voltage rises above undervoltage
(all other faults) (cycle keyswitch or power enable switch)
Full bridge
The 1223/33, 1225/35, 1227/37 controllers use a full bridge design for power
switching and direction selection. This eliminates the need for external or on-
board forward/reverse contactors. The result is a higher reliability product that is
simpler to install.
High-pedal-disable (HPD)
The HPD feature prevents controller output if the controller is turned on when
the throttle is not in neutral. If the operator attempts to start the vehicle when the
throttle is already applied, the controller output will remain off. For the vehicle to
start, the controller must receive an input to KSI before receiving a throttle input.
In addition to providing routine smooth starts, HPD also protects against
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. The HPD feature can be programmed On or Off—see Section 3, page 43.
HPD must be set to On to meet TÜV regulations.