Parker AC890PX Series, Engineering Reference

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D-156
A p p e n d i x D : P r o g r a m m i n g
AC890PX AC Drive
TORQUE LIMIT
SETUP::MOTOR CONTROL::TORQUE LIMIT
Designed for all Motor Control Modes.
This function block allows you to set the maximum level of motor rated torque which is allowed before torque limit action occurs.
If the estimated motor torque is greater than the ACTUAL POS LIM value, the motor speed is controlled to maintain the torque at this level. A
similar situation occurs if the estimated motor torque is less that the ACTUAL NEG LIM value.
The torque limit function block has separate positive and negative torque limits. In addition, a symmetric main torque limit is also provided.
The lowest positive and negative torque limits (including any current limit or inverse time current limit action) is indicated in the ACTUAL POS
LIM and ACTUAL NEG LIM diagnostic. These are the final limits used to limit motor torque.
Parameter Descriptions
POS TORQUE LIM PREF: 83.01 Default: 150.00 % Range: -300.00 to 300.00 %
This parameter sets the maximum allowed level of positive motor torque.
NEG TORQUE LIM PREF: 83.02 Default: -150.00 % Range: -300.00 to 300.00 %
This parameter sets the maximum allowed level of negative motor torque
MAIN TORQUE LIM PREF: 83.03 Default: 150.00 % Range: 0.00 to 300.00 %
This parameter sets the symmetric limit on the maximum allowed motor torque.
FAST STOP T-LIM PREF: 83.07 Default: 150.00 % Range: 0.00 to 300.00 %
This parameter sets the torque limit used during a Fast Stop.
SYMMETRIC LIM PREF: 83.04 Default: FALSE Range: FALSE / TRUE/
When TRUE, the NEG TORQUE LIM is forced to reflect the POS TORQUE LIM parameter.
ACTUAL POS LIM
PREF: 83.05 Default: —.00 % Range: —.00 %
This diagnostic indicates the final actual positive torque limit including any current limit or inverse time current limit action.
ACTUAL NEG LIM PREF: 83.06 Default: —.00 % Range: —.00 %
This diagnostic indicates the final actual negative torque limit including any current limit or inverse time current limit action.