Rockwell-automation 1771-QB Linear Pos. Manual do Utilizador descarregar pdf (Página 79)

Interpreting ModuletoPLC Data

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Chapter 6

618

the accuracy is degraded if the axis is unstable or if the velocity is extremely

low. Velocities at or above 10% of the maximum velocity work best.

the maximum velocities calculated by the module will not be accurate if

motion is impeded by physical obstructions.

the maximum velocity predictions will vary slightly for moves at different

velocities due to non-linearities in the hydraulic system. If it is critical that

the module perform best at a particular velocity, then that velocity should be

used to determine the optimal analog calibration constants. Otherwise, it is

best to use a moderately low velocity (10% of the maximum velocity) to

optimize the performance near the setpoint.

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Rockwell-automation 1771-QB Linear Pos. Manual do Utilizador Página 79