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Curtis 1244 Manual, Rev. E
3 — PROGRAMMABLE PARAMETERS: Field Control Parameters
EMR REV C/L
e emergency reverse current limit parameter defines the maximum braking
current provided through the motor when the emergency reverse function is
engaged. e emergency reverse current limit is adjustable from 50 amps to the
controller’s full rated braking current limit, in 5 amp increments.
CURRENT RATIO
e current ratio parameter defines how much of the programmed drive current
will be available to the motor at reduced throttle requests. is will determine
the maximum torque the motor can provide at partial throttle. e current ratio
parameter can be set to 1, 2, 4, or 8. ese settings represent a multiplication
factor applied to the current that would otherwise be available. For example,
if 20% throttle is requested with the current ratio set at 1, 20% of the battery
voltage and 20% of the drive current will be allowed to ow in the motor (as-
suming a 50% throttle map setting). If the current ratio is set at 2 under these
same conditions, 40% of the current will be available; if it is set at 4, 80%. e
controller will never allow more than the programmed drive current to ow
in the motor. If the current ratio is set at 8 with 20% throttle requested, the
controller will allow only 100% of the drive current and not 160%.
Because the current ratio parameter aects how much torque the motor
can provide, high current ratio settings will result in improved ramp climbing
with partial throttle, but may cause too much jumpiness at startup.
: e current ratio parameter is valid only when the control mode
parameter is set to Type 1 (Voltage Control).
FLD MAP START
e field map start parameter defines the armature current at which the field
map starts to increase from the Field Min value. is parameter is expressed in
amperes, and is adjustable from 0 to one half the controller’s full rated armature
current value, in 5 amp increments. e Field Map Start parameter is used to
equalize the vehicle’s maximum speed when loaded and unloaded.
Increasing the Field Map Start value increases the maximum load the
vehicle can carry while still maintaining maximum speed on a level surface.
Whether the vehicle’s loaded speed will actually increase depends on the arma-
ture current being drawn at that load. If the armature current is already below
the Field Map Start setting, increasing the Field Map Start value will not aect
the vehicle’s loaded speed.
Field Control Parameters
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