GE SX TRANSISTOR CONTROL IC3645SR4U404N2 - Manual (Page 63)

ADJUSTABLE FEATURES
SX TRANSISTOR CONTROLS Page 63
January 2000
Section 6.5 Summary of Current Limit Adjustments
ZERO
MAXIMUM
ZER
O
MAXIMUM
FIELD CURRENT
ARMATURE CURRENT
The " minimum field
current" setting is adjusted
by Function 7. The function
sets the top speed of the
motor. If used.
The " maximum field current" setting
is adjusted by Function 8. This
function, along with the
"armature
current limit", Function 4, sets the
maximum torque of the motor.
The "armature current limit"
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 be
achieved .
The " ratio" setting is adjusted by Function 26.
This function sets the ratio between armature
and field current when operating, I
MOTOR
is
above FWS and less than 300 amps. 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
approximately 300A armature
current.
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.
The " ratio-2 " setting is adjusted by Function 6.
This function sets the ratio between armature
and field current when operating, I
MOTOR
is
below FWS. Setting is the value of field current
changed for each 100 amps of armature current
changed.
Maximum field
current is fixed at
37.5 amps