Inverter In Torque Limit Detection - WEG CFW-11 Applications Manual

Parameters Description
Description of the identified moments:
1 – The load forward command is given through the digital input DI1. The motor becomes magnetized, and
voltage and frequency are applied to it. The brake remains closed.
2 – The motor frequency reaches the threshold adjusted in P1041 and the command to release the mechanical
brake through the digital output DO3 is executed. Momentary overload detection delay time, programmed in
P1053, starts elapsing because the load forward and brake release commands are presented.
3 – With the brake release, the load forward with the speed reference 1 adjusted in P1031 begins.
4 – The overweight detection delay time has elapsed.
5 – The motor current is greater than the overweight threshold programmed in P1050, the momentary overload
alarm delay timer begins counting the time programmed in P1052.
6 – The overweight alarm delay time has elapsed and the alarm "A770: Momentary Overload", is generated. The
digital output DO6 is activated indicating the momentary overload condition. The crane continues to operate
normally.
7 – The value of motor current is less than the value adjusted to momentary overload current threshold in P1050
and the momentary overload alarm condition is normalized. The digital output DO6 is deactivated indicating no
more alarm. The crane continues to operate normally
8 – The load forward command is removed from the digital input DI1. The motor deceleration begins. The brake
remains release.
9 – The motor frequency becomes less than or equal to the threshold adjusted in P1048, and the command to
close the mechanical brake is executed through the removal of the digital output DO3 command.
10 – The motor is decelerated down to 0 rpm and remains magnetized (If within the period programmed in
P1027 a new load forward or load reverse command does not occur, the motor will be demagnetized). The load
remains stopped, being held by the mechanical brake.

3.14 INVERTER IN TORQUE LIMIT DETECTION

This parameter group allows the user to adjust the conditions for the crane horizontal motion torque limit
detection during the load forward or reverse stages.
Inverter in Torque Limit is an abnormal condition detected in the crane horizontal motion operation, when the
CFW-11 frequency inverter is not able to execute the motion in the desired manner (with controlled speed), i.e.,
operating in a torque limit condition.
NOTE!
The inverter in torque limit detection is based on the CFW-11 frequency inverter speed control, after
the command to release the brake, i.e., the torque limit detection is not performed with the brake
closed. It is necessary to use sensorless vector or vector with encoder control mode for inverter in
torque limit detection.
P0169 – Maximum Positive Torque Current
P0170 – Maximum Negative Torque Current
Adjustable
0.0 to 350.0 %
Range:
Proprieties:
Access groups via HMI:
01 PARAMETER GROUPS
∟ 29 Vector Control
∟ 95 Torque Current Limit
Factory Setting:
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Crane Horizontal Motion | 47
130.0 %