ADJUSTABLE FEATURES
SX TRANSISTOR CONTROLS
Page 33
July 2001
FUNCTION 19
FIELD CURRENT RAMP RATE DURING
REGEN/PLUGGING
( Push CONT 4 )
This function adjusts the rate at which field current ramps
to full value during regenerative or plug braking.
Range
0 to 0.255 seconds
Setting
0 to 255
Resolution
0.001 seconds per set unit
Example:
Setting of 12 = 0.012 seconds
FUNCTION 20
MPH OVER SPEED LIMIT
( Push CONT 5)
This function adjusts the value of the over speed limit of the
control.
Resolution
1 MPH per set unit
Example:
Setting of 28 = 28 MPH
Important Note: The 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 21
RATE FIELD CHANGES IN OVERSPEED
(Push
CONT
6)
This function adjusts how quickly the control responds to
an over speed condition (as defined by the setting value of
function 20). A higher setting will result in the control
requiring a longer response time to an over speed
condition.
Range
0 to 0.255 seconds
Setting
0 to 255
Resolution
0.001 seconds per set unit
Example:
Setting of 2 = 0.002 seconds
Important Note: The 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 23
ERROR COMPENSATION
(Push CONT 8)
This function is used to reduce the ripple in field current
due to the interaction between motor field design and the
digital field current regulation circuit. The value for this
function should be set to 32.
Important Note: The 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 24
FIELD WEAKENING START (or MOTOR
KNEE POINT)
( Push CONT 9)
This function allows for setting the armature current at
which minimum field current will be achieved.
Range
0 to 350 Amps
Setting
0 to 255
Resolution
1.625 per set unit
Example:
Setting of 47 = 76.38 amps.
Important Note: The 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 25
MONITOR
( Push CONT 10)
This function allows the monitoring of certain control
functions by looking directly at the RAM of the
microprocessor. Because absolute memory locations need
to be known, this function should not be used without
detailed instructions from the GE application engineer.
To ensure optimum operation of the control, this function
must be left with zero stored in this register.
FUNCTION 26
RATIO OF FIELD TO ARMATURE AMPS
( Push CONT 11)
This function sets the ratio between armature and field
current when transitioning from minimum field to maximum
field current. The setting represents the quantity of field
current changed for each 1 amp of armature current
changed.
Max Max
Resolution Example
Fld Ref Change
Set
Per unit value If set at 3
40
.27
0 to 10
0.027 amps
0.081 amps
