ADJUSTABLE FEATURES
SX TRANSISTOR CONTROLS Page 56
February 2002
FUNCTION 6 FW RATIO
(Push 6)
This function sets the ratio between armature and field
current when operating below the Field Weakening Start
point. The setting represents the quantity of field current
changed for each 1 amp of armature current changed.
Max
Volts Fld Ref
48 60
72/80 55
The ratio value (VAL) is the set value divided by 10 and
rounded to the lowest whole number.
Example : Setting of 45 = 45/10 = 4.5 = 4 VAL.
I
FIELD
= VAL ( I
MOTOR
X .024 )
FUNCTION 7 MIN FIELD CURRENT
( Push 7 )
This function allows the adjustment of the field weakening
level in order to set the top speed of the motor.
Resolution
Volts Min Max Set Per unit value
48 0 60 51 to 255 .314
72/80 0 55 51 to 255 .269
MIN I
F
= (VAL-51) X .314 (48 VOLT)
Important Note: This function is used to optimize motor
and control performance, and this setting will be
determined by GE and OEM engineers at the time of
vehicle development. This setting must not be changed by
field personnel without the permission of the OEM.
FUNCTION 8 MAX FIELD CURRENT
( Push 8 )
This function allows for the adjustment of the maximum
field current in order to obtain the maximum torque of the
motor.
Resolution
Volts Min Max Set Per unit value
48 0 60 51 to 255 .314
72/80 0 55 51 to 255 .269
MAX I
F
= (VAL-51) X .314 (48 VOLT)
Important Note: This function is used to optimize motor
and control performance, and this setting will be
determined by GE and OEM engineers at the time of
vehicle development. This setting must not be changed by
field personnel without the permission of the OEM.
FUNCTION 9 REGEN BRAKING C/L
(Push 9)
This function allows for the adjustment of the Regen
braking current limit. The higher the current, the shorter the
stopping distance.
Resolution Example
Volts Min Max Set Per unit value If set at 20
48 183A 597A 0 to 255 1.625+183 215 amp
72/80 26A 440A 0 to 255 1.625 58 amps
REGEN BRAKE I
A
= (VAL X 1.625) + 183 48 VOLTS
FUNCTION 10 FIELD CURRENT FOR REGEN
( Push 10 )
This function allows for the adjustment of the field current
to be used during the regen braking mode.
Resolution Example
Volts Min Max Set Per unit value If set at 71
48 0 60 51 to 255 .314 6.28A
72/80 0 55 51 to 255 .269 amps 5.38A
Important Note: This function is used to optimize motor
and control performance and this setting will be
determined by GE and OEM engineers at the time of
vehicle development. This setting must not be changed by
field personnel without the permission of the OEM.
FUNCTION 12 MAX ARMATURE PERCENT ON
( Push 12 )
This function allows for the adjustment of the motor speed
limit (maximum battery volts to the motor). The dash
display mode selection enables the speed limit as well as
setting the level of speed limit.
Range 100% to 0% battery volts
Set 51 to 180
Resolution 0.78 % per set unit
Example Setting of 71 = 84.4 % battery
volts
FUNCTION 13 SPEED LIMIT 3
( Push 13 )
The SL3 set speed limit is activated by the Truck
Management Module 90,91 and also status code 99. See
Section 5 for Truck Management Module details;
Maintenance Speed Limit.
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