Parameter Reference D-113
AC30V series Variable Speed Drive
Stack Inv Time
Parameters::Motor Control::Stack Inv Time
The 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 Level
For a long time given by Long Overload Time, the drive is able to provide the Long Overload Level
These 2 protections work in parallel, the output limit current is the maximum value if Inv Time Active = False. If Inv Time Active = True, the
current limit is determined by Long Overload Level
the 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 is
ramped to the Inv Aiming Point is defined by Inv Time Down Rate. When the overload condition disappears, the inverse time current limit is
ramped 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 Descriptions
0343 100% Stack Current
Stack rating in rms amps corresponding to 100% stack current
0344 Long Overload Level
Overload value in % of the stack amps for long overload condition
0345 Long Overload Time
Maximum duration under long overload condition (typically 60s)
0346 Short Overload Level
Overload value in % of the stack amps for short overload condition
0347 Short Overload Time
Maximum duration under short overload condition (typically 3s)
0348 Inv Aiming Point
Current in % where the power stack can undertake the load current permanently
0349 Inv Time Output
Actual output current limit as a % of the stack current
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