Parker AC30 series, Руководство пользователя

Страница: 226 / 462

C-44
Parameter Reference
AC30 series Variable Speed Drive
Current Limit
Parameters::Motor Control::Current Limit
Designed for all Motor Control Modes
This function allows you to set the maximum level of motor rated current (as a % of the user-set
Motor Current ) which is allowed to flow before
current limit action occurs. If the measured motor current exceeds the current limit value with a motoring load, the motor speed is reduced to control
the excess load. If the measured motor current exceeds the current limit value with a regenerating load, the motor speed is increased up to a
maximum of
100% Speed in RPM (Scale Setpoint).
The maximum value of current limit for a particular motor is limited by the AC30V current rating.
If a motor of larger rating than the AC30V is connected, then the current limit max value is limited by the AC30V current rating.
If a motor of lower rating than the AC30V is connected, then the current limit max value is limited to 300% (if compatible with the AC30V current
rating) for an induction motor (IM) and to the ratio
PMAC Max Current to PMAC Rated Current for a PMAC motor.
% are always expressed as % of the user set
Motor Current (rated current of PMAC or IM Motor).
Parameter Name No. Path Default Range Units Writable
Current Limit
0305
Setup::Motor Control
::
Control and Type
Parameters::Motor Control::Current Limit
150.0 0.0 to 600.0 % ALWAYS
This parameter sets the level of motor current, as a % of Motor Current (refer to the relevant MOTOR definition , PMAC or IM
function) at which the Drive begins to take current limit action.
Regen Limit Enable
0307 Parameters::Motor Control::Current Limit TRUE ALWAYS
This parameter enables or disables regenerative current limit action.
Note that this parameter only works in open-loop VOLTS / Hz motor control mode.
Functional Description
Internal limit : output of the Stack Inv Time reduction
as a function of electrical low speed ( < 3Hz ) and as function
of heatsink temperature
minimum
Current limit
Internal limit
Current Limit Output