•
•
•
•
The delay is calculated on the basis of the reference speed of the drive and not on the basis of the actual
speed. Make sure that the drive has ramped up before activating the speed–compensated stop.
Same as [3] Speed comp stop but after each precise stop, the number of pulses counted during ramp down
to 0 RPM is reset.
Same as [3] Speed comp stop but the number of pulses counted during ramp down to 0 RPM is deducted
from the counter value entered in parameter 1-84 Precise Stop Counter Value. This reset function can be
used to compensate for the extra distance done during ramping down and to reduce the impacts of grad-
ual wear of mechanical parts.
The precise stop functions are advantageous in applications where high precision is required. If using a standard stop command,
the accuracy is determined by the internal task time. That is not the case when using the precise stop function. It eliminates the task
time dependence and increases the accuracy substantially. The drive tolerance is normally given by its task time. However, by using
its special precise stop function, the tolerance is independent of the task time because the stop signal immediately interrupts the
execution of the drive program. The precise stop function gives a highly reproducible delay from the stop signal is given until the
ramping down starts. Run a test to find this delay as it is a sum of sensor, PLC, drive, and mechanical parts.
To ensure optimum accuracy, there should be at least 10 cycles during ramping down, see:
Parameter 3-42 Ramp 1 Ramp Down Time
Parameter 3-52 Ramp 2 Ramp Down Time
Parameter 3-62 Ramp 3 Ramp Down Time
Parameter 3-72 Ramp 4 Ramp Down Time
The precise stop function is set up here and enabled from DI at terminal 29 or terminal 33.
Parameter 1-84 Precise Stop Counter Value
Table 133: Parameter 1-84 Precise Stop Counter Value
1-84 Precise Stop Counter Value
Parameter type: Range, 0 - 999999999
Change during operation: True
Enter the counter value to be used in the integrated precise stop function, parameter 1-83 Precise Stop Function. The maximum per-
missible frequency at terminal 29 or 33 is 110 kHz.
N O T I C E
Not used for selections [0] Precise ramp stop and [3] Speed comp stop in parameter 1-83 Precise Stop Function.
Parameter 1-85 Precise Stop Speed Compensation Delay
Table 134: Parameter 1-85 Precise Stop Speed Compensation Delay
1-85 Precise Stop Speed Compensation Delay
Parameter type: Range, 0 - 100 ms
Change during operation: True
Enter the delay time for sensors, PLCs, and so on for use in parameter 1-83 Precise Stop Function. In speed–compensated stop mode,
the delay time at different frequencies has a major influence on the stop function.
N O T I C E
Not used for selections [0] Precise ramp stop, [1] Cnt stop with reset, and [2] Cnt stop w/o reset in parameter 1-83 Precise Stop Func-
tion.
AU275636650261en-000101 / 130R0334 | 101Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide
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