GE SX Series

ADJUSTABLE FEATURES
SX TRANSISTOR CONTROLS Page 57
Revised May 2003
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
36/48 0 60 51 to 255 .314
MIN I
F
= (VAL-51) X .314 (36/48 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 OVER SPEED RESPONSE TIME
( Push 8 )
This function allows for the adjustment of the rate at which
field current increases in an over speed condition.
Resolution 1 set unit = 0.001 seconds
Example Setting of 100 = 0.1 second
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
36/48 183A 597A 0 to 255 (1.625 x
setting) + 183
215 amp
REGEN BRAKE I
A
= (VAL X 1.625) + 183 at 36/48 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.
Range 0 to 64 amps
Set 51 to 255
Resolution (VAL – 51) x 0.314
Example: Setting of 200 = 47 amps
FUNCTION 11 MAINTENANCE AND LOST TACH SPEED
LIMIT or PARK BRAKE SWITCH CLOSED
(Push 11)
This function allows for the adjustment of the motor speed
limit (maximum battery volts to the motor) when the tach
signal is lost, or a status code –81 appears on the dash
display.
Range 100% to 0% battery volts
Set 51 to 163
Resolution 0.89% per set unit
Example Setting of 71 = (163 – 71) x .89
= 82%
FUNCTION 12 MAX PERCENT ON
( Push 12 )
This function is always active and allows for the
adjustment of maximum armature volts, as a percentage of
the battery voltage.
Range 100% to 0% battery volts
Set 51 to 163
Resolution 0.89% per set unit
Example Setting of 71 = (163 – 71) x .89
= 82%
FUNCTION 13 SPEED LIMIT 3
( Push 13 )
The SL3 set speed limit is activated by status code 98,
indicating an overheated traction motor.
Range 100% to 0% battery volts
Set 51 to 163
Resolution 0.89% per set unit
Example Setting of 71 = (163 – 71) x .89
= 82%
FUNCTION 14 INTERNAL RESISTANCE
COMPENSATION
( Push 14 )
This function is used when the Battery Discharge Indicator
is present. Adjustment of this function will improve the
accuracy of the BDI. In order to determine this setting the
voltage drop of the battery under load must first be
calculated by the following method. This function can be
changed by the dash display mode selection button.
1. On a fully charged battery, record the open circuit
voltage (Vo) by measuring the voltage at the control
positive and negative power terminals.