Parker AC30V Series, Manual

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Parameter Reference
D-91
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
Stack Short Overl’d Sec , the drive is able to provide the Stack Short Overl’d %.
For a long time given by Stack Long Overl’d Sec , the drive is able to provide the Stack Long Overl’d %.
These 2 protections work in parallel, the output limit current is the maximum value if Stack Inv Time Active = False. If Stack Inv Time Active =
True, the current limit is determined by Stack Long Overl’d %.
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
Stack Aiming Point % is defined by Inverse 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 Inverse 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
Stack Long Overl'd %
Overload value in % of the stack amps for long overload condition
0345
Stack Long Overl'd Sec
Maximum duration under long overload condition (typically 60s)
0346
Stack Short Overl'd %
Overload value in % of the stack amps for short overload condition
0347
Stack Short Overl'd Sec
Maximum duration under short overload condition (typically 3s)
0348
Stack Aiming Point %
Current in % where the power stack can undertake the load current permanently
0349
Stack Inv Time Output %
Actual output current limit as a % of the stack current