PA7300 Instruction Manual - TECO-Westinghouse Motor Company

4th digit (operation select when frequency reference is missing)4th digit = 0Normal operation (varies with change of reference)4th digit = 1Operation continues with 80% frequency.When 4th digit = 1 is set, the current master speed frequency reference is comparedat all times with the one occurred 0.4 second before. When the current master speedfrequency reference goes below 10% of the one that occurred 0.4 second before,operation continues with 80% (80% frequency) of the master speed frequencyreference of the prior one. Consequently, the master speed frequency reference ofthe previous one (0.4 second before) is used as the current frequency reference.In the following cases, this operation is released and the inverter returns tonormal operation:Master speed frequency reference exceeding 80% frequency is input.Stop reference is input.Reference is missing during operation at less than 5% of frequency.FWD RUNCOMMANDMASTER SPEEDFREQUENCYREF.80%0.4Sec0.4Sec10%INVERTEROUTPUTFREQUENCYTIME CHART80% OFFREQUENCY(7) Operation Mode Select 4 (Sn-07)Define the operation at overtorque detection. Overtorque is detected by the followingformula:Inverter output current B overtorque detection level (Cn-26, Initial value: 160 %)(Detection time Cn-27, Initial value: 0.1 second, Hysteresis fixed at 10%)1st digit1st digit = 0Overtorque is not detected.1st digit = 1Overtorque is detected.79