Curtis PMC 1297 Manual
41
FIELD MIN
The minimum field current limit parameter defines the minimum allowed
field winding current. The minimum field current limit setting determines the
vehicle’s maximum speed. Field Min can be adjusted from 2 amps up to the
programmed Field Max value.
The Field Min parameter is tuned as part of the vehicle performance
adjustment process (Section 5).
FIELD MAX
The maximum field current limit parameter defines the maximum allowed
field winding current. The maximum field current limit setting determines the
vehicle’s maximum torque and limits the power dissipation in the field winding
itself. Field Max can be adjusted from the programmed Field Min value up to
the controller’s full rated field current. (The full rated field current depends on
the controller model; see specifications in Table E-1.)
The Field Max parameter is tuned as part of the vehicle performance
adjustment process (Section 5).
FLD MAP START
The field map start parameter defines the armature current at which the field
map starts to increase; it is adjustable from 25 amps up to the controller’s full
rated armature current value. (The full rated armature current depends on the
controller model; see specifications in Table E-1.)
The field map start parameter is used to equalize the vehicle’s maximum
speed when loaded and unloaded. Increasing the field map start parameter
value will increase the maximum load weight that the vehicle can carry while
maintaining maximum speed on a level surface.
The field map start parameter is tuned as part of the vehicle performance
adjustment process (Section 5).
FIELD MAP
The field map parameter controls how much field current is applied for a given
armature current. This parameter, along with the other field current parameters
(Field Min, Field Max, and Field Map Start), allows the OEM to set the vehicle’s
speed and power performance characteristics.
The field map parameter is set as a percentage of the field current between
the Field Min and Field Max values. As shown in Figure 19, the field map
parameter adjusts the field current at a point halfway between the programmed
Field Map Start current and the full armature current (which is the controller’s
3
A
— PROGRAMMABLE TRACTION PARAMETERS: Field
Field Parameters
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