GE IC3645SR4U404N2, IC3645SP4U400N3 Field Current, Summary of Current Limit Adjustments

ADJUSTABLE FEATURES

SX TRANSISTOR CONTROLS

Section 6.5 Summary of Current Limit Adjustments

Page 63

MAXIMUM

FIELD CURRENT

ZERO

The " maximum fieldcurrent" setting	Maximum field
	current is fixed at
is adjusted by Function 8. This	37.5 amps
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 is

MOTOR

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.

The " field weakening start" setting is adjusted by Function 24. This function sets the armature current at which minimum field current will be achieved .

ARMATURE CURRENT

ZERO	The "full load transition point"
	is calculated by the controlThis.
	function sets the maximum field
	current transition point at
	approximately 300A armature
	current.

MAXIMUM

The " ratio-2 " setting is adjusted by Function 6. This function sets the ratio between armature and field current when operating, I is

MOTOR

below FWS. Setting is the value of field current changed for each 100 amps of armature current changed.

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.

January 2000