Parker EME
Setting up Compax3
192-120103 N13 C3I20T11 / C3I32T11 December 2010
133
4.1.8.
Defining jerk / ramps
In this chapter you can read about:
Speed for positioning and velocity control ......................................................................133
Acceleration for positioning and velocity control .............................................................133
Acceleration / deceleration for positioning ......................................................................133
Jerk limit for positioning..................................................................................................133
Ramp upon error and de-energize .................................................................................134
Jerk for STOP, MANUAL and error ................................................................................135
4.1.8.1
Speed for positioning and velocity control
Standard speed for all positionings and motion functions.
The value can be changed during operation via the bus or via the motion sets.
This setting is not relevant for the "rotation speed" operating mode.
4.1.8.2
Acceleration for positioning and velocity control
Standard acceleration for all positionings and motion functions.
The value can be changed during operation via the bus or via the motion sets.
4.1.8.3
Acceleration / deceleration for positioning
Standard deceleration for all positionings and motion functions.
The value can be changed during operation via the bus or via the motion sets.
If "0" is entered, the acceleration value is accepted as deceleration.
4.1.8.4
Jerk limit for positioning
Standard jerk for all positionings and motion functions.
The value can be changed during operation via the bus or via the motion sets.
In the operating modes:
Speed control
Velocity and
Gearing
the jerk is not limited.
Description of jerk
Jerk
The jerk (marked with “4” in the drawing below) describes the change in
acceleration (derivation of the acceleration)
The maximum change in acceleration is limited via the jerk limitation.
A motion process generally starts from a standstill, accelerates constantly at the
specified acceleration to then move at the selected speed to the target position.
The drive is brought to a stop before the target position with the delay that has
been set in such a manner as to come to a complete stop at the target position. To
reach the set acceleration and deceleration, the drive must change the acceleration
(from 0 to the set value or from the set value to 0).
This change in speed is limited by the maximum jerk.
According to VDI2143 the jerk is defined (other than here) as the jump in
acceleration (infinite value of the jerk function).
This means that positionings with Compax3 are without jerk according to VDI2143,
as the value of the jerk function is limited.
Without jerk
according to
VDI2143
