Emerson Epsilon EP Drive 400518-01 Manual de instalación Pagina 57

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45
Setting Up Parameters
The user may set the number of filter samples to be used to “smooth” the master encoder velocity. The more samples used
by the filter, the smoother the master velocity signal, however, the more positional delay introduced by the filter. This means
that more filtering will cause more position error between master and follower. Feedforward is used in conjunction with the
filter to provide accurate positioning performance while still maintaining smooth motion.
The table below can be used to best determine the proper filter settings for your application.
Filter parameters cannot be changed using the “Update to RAM” feature. Changes must be fully downloaded before taking
effect.
The gray box in the table above denotes the default setting for the master filter parameters.
Enable Check Box
The Enable check box is used to turn on or turn off the Master Position Filter. If selected, the filter is turned on (active) and
the user must select the number of samples used by the filter. If clear, the filter is not used.
Samples
Defines the number of samples used by the filter to smooth the master signal. Increasing the number of samples increases
smoothness, but also increases lag. See Filter table above to select proper setting.
Enable Feedforward Check Box
The Enable Feedforward check box is used to turn on or turn off feedforward. If selected, feedforward is active. If the check
box is clear, feedforward is not used.
Position View
The Position View allows you to set up and view the parameters related to drive positioning. In Figure 42, Position has been
selected in the Hierarchy Tree. The right side of the view is divided into groups. An explanation of the groups and their
functions is provided below.
Feedforward OFF Feedforward ON
# of
Samples
Disabled
One update of phase shift
(not velocity dependent)
No Filtering
No delay,
No Filtering
4
Small Lag (function of speed),
Low Filtering
Poor at low speed,
Low Filtering
8
Medium Lag (function of speed),
Medium Filtering
Good at low speed,
Medium Filtering
16
Large Lag (function of speed),
High Filtering
Best at low speeds,
High Filtering
Smoother
Increasing Lag
with FF Off
Reduced Lag
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