Specifications

Curtis PMC 1223/33, 1225/35, 1227/37 Manual
A-9
APPENDIX A: GLOSSARY
commands are received. Normal operation resumes when the throttle is moved.
If the throttle remains at neutral for 25 minutes, the controller powers down
completely; normal operation resumes when the keyswitch (or power enable
switch, if used) is cycled.
Precharge
The precharge feature soft-charges the controller’s internal capacitor bank when
the controller is first turned on and before the main relay is engaged. This protects
the main relay’s contacts from the large inrush currents that exist when battery
voltage is applied to a discharged capacitor bank.
Precharge fault
The precharge fault feature keeps the main contactor from being engaged if the
internal capacitor bank voltage does not rise above the minimum threshold within
500 ms after the controller is turned on. This protects the system against faults that
short the controller’s internal B+ bus.
Procedural/wiring fault (HPD lockout)
After 5 seconds of a continuous HPD fault, driving is inhibited until power to the
controller is cycled. This feature prevents operation of a vehicle with a defective
or misadjusted throttle.
Push
The push feature allows the brake to be released electrically so that the vehicle can
be pushed. This is convenient when, for example, it is appropriate for an
attendant to manually push a mobility aid scooter. The push feature inhibits the
controller’s drive function until the push switch is turned off, thus ensuring that
the vehicle cannot be operated in a condition in which the electromagnetic brake
cannot be engaged. To use the push feature, the batteries must be wired to the
controller, the keyswitch must be enabled, the vehicle must be stopped, and the
electromagnetic brake must be engaged.
If the vehicle is pushed too fast, indicating a runaway or other abnormal
condition, the controller will automatically turn on and limit the speed of the
vehicle (see Push-too-fast, below).
Push-too-fast
The push-too-fast feature limits the maximum speed at which the vehicle can be
pushed, thus guarding against unpowered vehicle runaway with the electromag-