ADJUSTABLE FEATURES
IT TRANSISTOR CONTROLS
Page
39
November 2005
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Section 5.4 Setup Functions for Traction Controller
FUNCTION 1 MPH SCALING
(Push
1)
This function allows for the pulses from the tachometer to
be scaled to miles per hour, based on the number of
pulses received by the control during a given time period.
For example, if you were scaling to 8 MPH, it would
correspond to the length of time necessary to capture 8
tachometer pulses when the vehicle is traveling at 8 MPH.
Range
0 to 1.28 seconds
Set
0 to 255
Resolution
0.005 seconds per set unit
Example
Setting of 18 = 0.09 seconds
Example to determine setting:
RR = rolling radius (inches)
Pi = 3.14159265
GR = gear ratio
PPR = pulses per rotation o f the motor
MPH = miles per hour
Setting = 3600 X 2 X Pi X RR X Pulses per MPH
5280 X 12 X GR X PPR X 0.005 X MPH
Setting = 3600 X 2 X 3.14259265 X 9 x1 = 203575 = 18
5280 X 12 X 8.91 X 4 X 0.005 X 1 11290
FUNCTION 2 CREEP SPEED
(Push
2)
This function allows for the adjustment of the creep speed
of the vehicle. Creep speed can be adjusted when an
accelerator input voltage between 3.9 and 3.3 volts or an
accelerator ohm input between 6.0K and 4.0K ohms is
provided.
Range
2% to 15% on-time
Set
0
to
255
Resolution
0.05% per set unit
Example
Setting of 20 = 3% on-time
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 3 ARMATURE CONTROLLED
ACCELERATION
(Push
3)
This function allows for the adjustment of the rate of time
it takes for the control to accelerate to 100% applied
battery voltage to the motor on hard acceleration.
Range
0.1 to 25.5 seconds
Set
0 to 255
Resolution
0.086 seconds per set unit
Example:
Setting of 20 = 1.72 seconds
FUNCTION 4 ARMATURE CURRENT LIMIT
(Push
4)
This function allows for the adjustment of the armature
current limit of the control. The rating of the control will
determine the range of adjustment for this function.
Please refer to the specification sheets and current limit
curves for the control used in your vehicle.
Range
See control C/L curves
Set
0 to 255
Example:
0 = min. current, 255 = max.
current
FUNCTION 5 PEDAL UP REGEN RATE
(Push
5)
This function adjusts the rate at which speed is reduced
during regenerative braking when the accelerator pedal is
released and start switch opens or the control receives a
directional change signal.
Setting
1 to 255
Setting of 1 = Most aggressive braking
Setting of 255 = Least aggressive braking
