Precharge - Curtis 1244 User Manual

3 — PROGRAMMABLE PARAMETERS:
Other Parameters

PRECHARGE

The precharge parameter enables or disables the precharge function. When
this parameter is set to "On," the precharge function does not close the main
contactor until the internal power capacitor bank charges to within 10% of the
battery voltage. Charging is accomplished internally and an external precharge
resistor is not required. If the capacitor voltage does not reach this theshold, a
precharge fault is issued and the main contactor is never closed. This reduces
inrush current stresses on the capacitor bank and provides protection against
allowing full battery power to be engaged if there is a short in the output section.
Setting the parameter to "Off" disables the precharge function. The precharge
function is required for systems using 48V (or higher) battery packs.
LOAD COMP
The load compensation parameter actively adjusts the applied motor voltage as
a function of motor load current. This results in more constant vehicle speeds
over variations in load and in driving surface (ramps, etc.) without the vehicle
operator having to constantly adjust the throttle position. This parameter will
also help equalize loaded and unloaded vehicle speeds. Higher load compensation
values will cause the controller to be more aggressive in attempting to maintain
vehicle speed. However, too much load compensation can result in jerky vehicle
starts and speed oscillation ("hunting") when the vehicle is unloaded.
The load compensation parameter is adjustable from 0 to 25. Recom-
mendations for adjusting this parameter are provided in Section 6: Vehicle
Performance Adjustment.
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Curtis 1244 Manual,
Rev. E