KEB COMBIVERT F5, Reference Manual

Page: 106 / 349

Setting the Control Mode LC01 = 3, Closed Loop Analog Pretorque allows the
drive to use an external pretorque input signal via AN2+ and AN2- on terminal
strip X2A for use with an analog load weighing device.
The first step is to ensure the load-weigher is calibrated according to the
manufacturer’s instructions. Have the car in an empty load situation and set
LC01 = 3, Closed Loop Analog Pretorque.
Set the inspection speed in the controller to zero. Set LT01, Brake Pick Delay
and LT03, Speed Start Delay, to values larger than one second.
Change the keypad display to Diagnostic Screen #3 to monitor “Actual Torque.”
Pick a direction so that the motor holds at zero speed. Monitor “Actual Torque”
on the keypad and make a note of the value before the brake lifts and the
value after the brake lifts with the motor holding at zero speed.
Adjust LA16 and LA17, Analog Input 2 X & Y offsets and repeat the previous
step until the value of “Actual Torque” before the brake lifts matches the value
after the brake lifts. When this occurs, there should be no noticeable rollback
when the brake lifts.
Load the car with weights. Full load is preferred, but not required.
Monitor the value of “Actual Torque” before the brake picks and when the motor
holds zero speed. Adjust LA15, Analog Input 2 Gain until the value of “Actual
Torque” before the brake lifts matches the value after the brake lifts. When this
occurs there should be no noticeable rollback when the brake lifts.
Remove the load, repeat the previous step, and adjust LA15 as needed.
Return the inspection speed, LT01 Brake Pick Delay, and LT03 Speed Start
Delay to their original values.
5.12.3 Closed Loop
Analog Pretorque
106
Initial Startup