ADJUSTABLE FEATURES
SX TRANSISTOR CONTROLS
Page 35
July 2001
Section 5.5 Summary of Current Limit Adjustments
ZERO
MAXIMUM
ZER
O
MAX
IMUM
F
IE
L
D CU
RRE
NT
ARMATURE CURRENT
The
" minimum field
current"
setting is
adjusted by Function 7. The
function sets the top speed
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.
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
" field weakening start "
setting is adjusted by Function 24.
This function sets the armature
current at which minimum field
current will achieved .
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
"full load transition point"
is calculated by the control. This
function sets the maximum field
current transition point at 238
amps.
The
" error compensation "
setting is adjusted by
Function 23. 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.
238
amps
