Jog; Figure 6.4-1- Trapezoidal Motion Profile; Figure 6.4-2 - Position And Acceleration Profiles - Newport ESP6000 User Manual

Desired Velocity
Time
Figure 6.4-1— Trapezoidal Motion Profile
The position and acceleration profiles relative to the velocity are shown in
Figure 6.4-2.
Position
Desired Velocity
Time
Acceleration
Figure 6.4-2 — Position and Acceleration Profiles
Besides the destination, the acceleration and the velocity of the motion
(the constant portion of it) can be set by the user before every move
command. Advanced controllers like the ESP6000 controller card allow
the user to change them even during the motion. However, the ESP6000
controller card always verifies that a parameter change can be safely
performed. If not, the command is ignored and the motion continues as
initially defined.

6.4.2 Jog

When setting up an application, it is often necessary to move stages manu-
ally while observing motion. The easy way to do this without resorting to
specialized input devices such as joysticks or track-wheels is to use simple
push-button switches. This type of motion is called a jog. When a jog
button is pressed the selected axis starts moving with a pre-defined veloc-
ity. The motion continues only while the button is pressed and stops
immediately after its release.
The ESP6000 controller card offers two jog speeds. The high speed is
programmable and the low speed is ten times smaller. The jog acceleration
is also ten times smaller than the programmed maximum acceleration
values.
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