Curtis 1297 - Page 101

Curtis PMC 1297 Manual
A-4
APPENDIX A: GLOSSARY
Fault detection and response
An internal microcontroller automatically maintains surveillance over the func-
tioning of the controller. When a fault is detected, the appropriate fault code is
signalled. If the fault is critical, the controller is disabled. More typically, the
fault is a remediable condition and temporary. The faults covered by the 1297
controller’s automatic fault detection system are listed in Table 5—see Section 7,
page 85.
Fault recording
Fault events are recorded in the controller’s diagnostic history file. Multiple
occurrences of the same fault are recorded as one occurrence. This fault event list
can be loaded into the programmer for readout. The programmer’s 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 interlock switch to reset
the controller and enable operation. The only exceptions are these:
FAULT RECOVERY
anti-tiedown when mode switch is released
emerg. rev. wiring when wiring fault is corrected
HPD/SRO when proper sequence is followed
overvoltage when battery voltage drops below overvoltage threshold
thermal cutback when temperature returns to the acceptable range
throttle faults when input signal returns to the acceptable range
undervoltage when battery voltage rises above undervoltage threshold
(all other faults) (cycle keyswitch or interlock switch)
Field map
The field map parameter determines the relationship between the traction
motor’s shunt field winding current and armature current. The field map
parameter affects vehicle acceleration and midrange torque characteristics—see
Section 3A, page 41.
Field map start
The field map start parameter defines the armature current at which the traction
motor’s field map starts to increase. The field map start parameter is used to help
equalize the motor’s maximum speed when loaded and unloaded—see Section
3A, page 41.