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ADJUSTABLE FEATURES
SX TRANSISTOR CONTROLS
Section 6.5 Summary of Current Limit Adjustments
MAXIMUM
ZERO
The " ratio" setting is adjusted by Function 26.
This function sets the ratio between armature
and field current when transitioning from
minimum field to maximum field current. Setting
is the value of field current changed for each 100
amps of armature current changed.
The " error compensation " setting is adjusted by
Function 27. 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 will be defined by the
GE application engineer.
The " minimum field
current" setting is adjusted
by Function 7. The function
sets the top speed of the
motor.
The " field weakening start "
setting is adjusted by Function 24.
This function sets the armature
current at which minimum field
current will achieved .
ARMATURE CURRENT
The "full load transition point "
is calculated by the control. This
function sets the maximum field
current transition point at
approximately 80% of the
maximum armature current.
The " maximum armature
current" setting is adjusted by
Function 4. The function along with
the "maximum field current"
(Function 8) sets the maximum
torque of the motor.
The " maximum field current"
setting is adjusted by Function 8.
This function, along with the
"maximum armature current"
(Function 4), sets the maximum
torque of the motor.
October 1998
Page 60
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