E6582175Q-12171) Setting the electronic thermal protection characteristics selection olmolmolmolmand motor electronic thermal protection level 1 thrthrthrthr, 2 f173f173f173f173The electronic thermal protection characteristics selection (olm) is used to enable or disable the motor overload tripfunction (ol2) and the overload stall function.While the inverter overload trip (ol1) will be in constantly detective operation, the motor overload trip (ol2) can beselected using the parameter olmExplanation of termsOverload stall: This is an optimum function for equipment such as fans, pumps and blowers with variable torquecharacteristics that the load current decreases as the operating speed decreases.When the inverter detects an overload, this function automatically lowers the output frequency before the motoroverload trip (ol2) is activated. With this function, operation can be continued, without tripping, by operating usinga frequency balanced by load current.Note: Do not use the overload stall function with loads having constant torque characteristics (such as conveyor beltsin which load current is fixed with no relation to speed).[Using standard motors (other than motors intended for use with inverters)]When a motor is used in the lower frequency range than the rated frequency, that will decrease the cooling effects for themotor. This speeds up the start of overload detection operations when a standard motor is used in order to preventoverheating. Setting of electronic thermal protection characteristics selection olmSetting value Overload protection Overload stall0 valid invalid1 valid valid2 invalid invalid3 invalid valid Setting of motor electronic thermal protection level 1 thr (Same as f173)When the capacity of the motor in use is smaller than the capacity of the inverter, or the rated current of the motoris smaller than the rated current of the inverter, adjust thermal protection level 1 thr for the motor inaccordance with the motor's rated current.
