Parker AC30 series, User Manual

Page: 431 / 522

Parameter Reference
D-171
AC30 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.
Parameter Name No. Path Default Range Units Writable
100% Stk Current 0343 Parameters::Motor Control::Stack Inv
Time x.x 0.0 to 10000.0 A NEVER
Stack rating in rms amps corresponding to 100% stack current
Long Overload Level 0344
Parameters::Motor Control::Stack Inv
Time
x. 0 to 200 %
NEVER
Overload value in % of the stack amps for long overload condition(*)
Long Overload Time 0345 Parameters::Motor Control::Stack Inv
Time 0.000 to 100000.000 s NEVER
Maximum duration under long overload condition (typically 60s)