Summary Of Current Limit Adjustments - GE IC3645SR4T405CT1 Installation And Operation Manual

ADJUSTABLE FEATURES
IT TRANSISTOR CONTROLS
Section 5.5 Summary of Current Limit
Adjustments
MAXIMUM
ZERO
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 " ratio" setting is adjusted by Function 26.
This function sets the ratio between armature
and field current when operating, I
above FWS and less than 300 amps. Setting
is the value of field current changed for each
100 amps of armature current changed.
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 " minimum field
current" setting is adjusted
by Function 7. The function
sets the top speed of the
motor. If used.
is
MOTOR
ARMATURE CURRENT
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 "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.
Maximum field
current is fixed at
37.5 amps
The " field weakening start"
setting is adjusted by Function
24. This function sets the
armature current at which
minimum field current will be
achieved .
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January 2008