Curtis 1244 - Page 87

Curtis 1244 Manual, Rev. E
A-5
APPENDIX A: GLOSSARY
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. e only exceptions are these:
FAULT RECOVERY
anti-tiedown when Mode Select 1 switch is released
contactor overcurrent when condition clears
HPD when throttle is lowered below HPD threshold
overvoltage when battery voltage drops below overvoltage
SRO when proper sequence is followed
thermal cutback when temperature returns to acceptable level
throttle faults when condition clears
undervoltage when battery voltage rises above undervoltage
(all other faults) (cycle keyswitch or interlock switch)
Field map
e field map parameter determines the relationship between the shunt field
winding current and the armature current. e field map parameter aects
vehicle acceleration and midrange torque characteristics. is parameter is
programmable—see Section 3, page 39.
Field map and the other field current parameters (field map start, field
max, field min) allow the OEM to tune the vehicle’s performance characteris-
tics—see Section 6, pages 57–61.
Field map start
e field map start parameter defines the armature current at which the field
map starts to increase. e field map start parameter is used to help equalize
the vehicle’s maximum speed when loaded and unloaded. is parameter is
programmable—see Section 3, page 38.
Field map start and the other field current parameters (field map, field
max, field min) allow the OEM to tune the vehicle’s performance characteris-
tics—see Section 6, pages 57–61.
Full bridge
e 1244 controller uses a full bridge design for control of the field winding.
is eliminates the need for external direction contactors. e result is a higher
reliability product that is smaller and simpler to install.
Half bridge
e 1244 controller uses a half bridge topology for the armature drive. is
provides reliable and highly efficient vehicle control with full all-electronic
regenerative braking to zero speed.