Parameter Reference D-108AC30V series Variable Speed DriveStack Inv TimeParameters::Motor Control::Stack Inv TimeThe purpose of the inverse time is to automatically reduce the drive current limit in response to prolonged overload conditions.For a short time given by Short Overload Time, the drive is able to provide the Short Overload LevelFor a long time given by Long Overload Time, the drive is able to provide the Long Overload LevelThese 2 protections work in parallel, the output limit current is the maximum value if Inv Time Active = False. If Inv Time Active = True, thecurrent limit is determined by Long Overload Levelthe current limit is not yet ramped down. If already ramped down, the current limit is due to the long overload.When the maximum overload value is reached, the inverse time current limit is ramped down. The rate at which the inverse time current limit isramped to the Inv Aiming Point is defined by Inv Time Down Rate. When the overload condition disappears, the inverse time current limit isramped up. The rate at which the inverse time current limit is ramped to the maximum value is defined by Inv Time Up Rate.% Are all referring to drive/stack ratings.PNO Parameter Descriptions0343 100% Stack CurrentStack rating in rms amps corresponding to 100% stack current0344 Long Overload LevelOverload value in % of the stack amps for long overload condition0345 Long Overload TimeMaximum duration under long overload condition (typically 60s)0346 Short Overload LevelOverload value in % of the stack amps for short overload condition0347 Short Overload TimeMaximum duration under short overload condition (typically 3s)0348 Inv Aiming PointCurrent in % where the power stack can undertake the load current permanently0349 Inv Time OutputActual output current limit as a % of the stack current0350 Inv Time Up Rate
