Closed Loop Digital Pretorque; Predictive Synthetic Pretorque - KEB COMBIVERT F5 Operation Manual

Advanced Ride
4.12.7. Closed Loop
Digital Pretorque
4.12.6. Predictive
Synthetic Pretorque
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By setting the Control Mode LC01 = 4, Closed Loop Digital Pretorque, a
fixed digital pretorque value (% of the motor rated torque) is set with LC34
Digital Pretorque. This applies to US04 Control Types Digital (0), Binary (1),
Absolute Analog (2), Bi-Polar Analog (3) and Serial Binary Speed DIN66019
Service 50 (6).
LC34 is NOT ACTIVE with US04 Control Types Serial Speed DIN66019
Service 49 (4) and Serial Speed DIN66019 Service 50 (5). Instead, the
pretorque value is sent serially to the drive via the controller, utilizing a load
weigher. The load weigher should be properly calibrated and the associat-
ed controller settings should be correct. The pretorque value can be viewed
in FB03 Field Bus Pretorque.
In most applications, if the load weigher and controller are set up properly,
no further drive adjustment should be necessary. However, if further ad-
justment is required, LA15 Analog Input 2 Gain and LA17 Analog Input 2 Y
Offset can be adjusted. See section 6.13 for more information.
Processed pretorque value= (FB03 + LA17)*LA15
By setting the Control Mode LC01 = 5, Closed Loop Synthetic Pretorque
the drives internal pre-torque function is activated with predictive synthetic
pretorque and brake release timing.
Brake Release Timing
This function dynamically measures the time that was taken for the brake to
release from the point when the enable signal was given. Brake release time
is displayed in DG59 Brake Release Time. This allows for the adjustment of
the LT02-LT03 timers, reducing the difficulty in calculating this time. The time
measured is from when the enable signal is received to when the torque of
the motor changes.
Predictive Synthetic Pre-Torque Function
Adjust the internal pretorque with LC01 = 2, Closed Loop FOC as outlined in
section 5.12.2, before setting LC01 = 5, Closed Loop Synthetic Pretorque. This
function will calculate the required holding torque based on the load inside
of the car and then use 90% of the holding torque value as the anticipated
pretorque requirement for the next run. This function requires that the brake is
open before the end of the Speed Start Delay Timer LT03 in order to accurately
determine the load percentage and calculate the required pretorque. The load
percentage of the preceding run can be seen in DG58 Car Load.