Programming
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
Page
D-19
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CURRENT LIMIT
SETUP::MOTOR CONTROL::CURRENT LIMIT
Designed for all Motor Control Modes, except PMAC control mode.
This function block 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 shed 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 MAX SPEED (REFERENCE function
block).
Note
The maximum value of current limit for a particular motor is limited by the 890 current rating. If a motor of larger
rating than the 890+ is connected, then the current limit applies to the 890 and not the motor. In this case, the
maximum value of the CURRENT LIMIT parameter is 150.00%.
Parameter Descriptions
CURRENT LIMIT
PREF: 82.01
Default: 150.00 %
Range: 0.00 to 300.00 %
This parameter sets the level of motor current, as a % of MOTOR CURRENT (refer to the MOTOR INDUCTION function
block) at which the Drive begins to take current limit action.
REGEN LIM ENABLE
PREF: 82.02
Default: TRUE
Range: FALSE / TRUE
This parameter enables or disables regenerative current limit action.
Note that this parameter only works in open-loop VOLTS / Hz motor control mode.
