7.5.1.3 Adjusting S-curve
If adjusting the encoder data and control settings does not achieve the optimal
performance, the next step is to adjust the S-Curve. The S-Curve might be too
aggressive or there might be resonance at that specific speed. If US03 Control Type is
serial, or analog speed, the S-Curve is adjusted on the controller. If US03 is anything
else, then the S-Curve will be adjusted in the speed profile parameters.
• Lower Acceleration Rate (If the S-Curve is too aggressive)
• Lower Deceleration Rate (If the S-Curve is too aggressive)
• Lower the High Speed (If there is resonance)
7.5.2 Rollback Issues
If rollback happens, either at the beginning or the end of the run, drive and controller
adjustments can be made to eliminate it. Rollback at the beginning may involve timer
adjustments on the drive and controller, load weigher adjustments (if applicable) or drive
pre-torque adjustments. Rollback at the end will involve timer adjustments on the drive
and controller. Follow the steps below for the scenario the elevator is experiencing.
7.5.2.1 Rollback at the Beginning of the Run (No load weigher device)
To adjust for the scenario where there is rollback at the beginning of the run and there is
no load weigher device, the first step is to adjust the pre-torque values in control settings.
the larger the pre-torque values, the faster the pre-torque will build up, which yields a
stronger hold at the beginning of the run. Adjust KP speed pre-torque first, and then if
needed adjust KI speed pre-torque to fine-tune. If there is too much pre-torque, the motor
will have an audible growling/groaning noise before spinning. If pre-torque has been set
too high and there is still rollback, then the issue is with timing at the beginning of the run.
• LC10 KI Speed Pre-torque (Default is 1000, increase by 500)
• LC05 KP Speed Pre-torque (Default is 3000, increase by 2000)
• Adjust Speed Start Delay Timer (Decrease LT03 on the drive or on the controller to
have the drive immediately take off when given command)
• Adjust Brake Pick Delay Timer (Decrease LT01 on the drive or on the controller to
prevent any brake pick delay)
7.5.2.2 Rollback at the Beginning of the Run (with load weigher device)
If there is rollback during beginning of the run and there is a load weigher device, then
the internal pre-torque values in the drive will have no affect. Adjusting the load weighing
device should be the first step to adjusting the rollback. The next steps will depend on if
the load weigher device is connected directly to the drive or if it is connected to the
controller. The drive can adjust the response of the load weigher device. If the
adjustments fail, then it is most likely a timing issue at the beginning of the run.
If the load weigher device is directly connected to the drive, ensure that LC01 Control
-
To Next Page
Loading...
Need help?
General