GE IC3645SH7R353T1 Installation And Operation Manual

ADJUSTABLE FEATURESSX TRANSISTOR CONTROLS Page 36August 2001Section 5.5 Summary of Current Limit AdjustmentsZEROMAXIMUMZEROMAXIMUMFIELD CURRENTARMATURE CURRENTThe " minimum fieldcurrent" setting isadjusted by Function 7. Thefunction sets the top speedof the motor.The " maximum field current"setting is adjusted by Function 8.This function, along with the"maximum armature current"(Function 4), sets the maximumtorque of the motor.The " maximum armaturecurrent" setting is adjusted byFunction 4. The function alongwith the "maximum fieldcurrent" (Function 8) sets themaximum torque of the motor.The " field weakening start "setting is adjusted by Function 24.This function sets the armaturecurrent at which minimum fieldcurrent will achieved .The " ratio" setting is adjusted by Function26. This function sets the ratio betweenarmature and field current when transitioningfrom minimum field to maximum field current.Setting is the value of field current changed foreach 100 amps of armature current changed.The "full load transition point"is calculated by the control. Thisfunction sets the maximum fieldcurrent transition point at 238amps.The " error compensation " setting is adjusted byFunction 23. This function is used to reduce theripple in field current due to the interaction betweenmotor field design and the digital field currentregulation circuit. The value for this function will bedefined by the GE application engineer.238amps