PI M-687.UN User Manual page 31

6 Starting and Operating
NOTICE
Uncontrolled oscillation!
Your application can be damaged by uncontrolled oscillation of the M-687.UN.
If you encounter noise during operation:
 Immediately switch off the servo control system of the affected axes.
 Check the settings of the servo control parameters.
NOTICE
Impact of platforms on the hard stop!
The impact of the M-687.UN's platforms on the hard stop could lead to damage or
considerable wear on the M-687.UN.
 Avoid motion in open-loop operation.
 If motion in open-loop operation is necessary with the C-867 controller:
− Set the control value with the SMO command so that the axes move at low velocity.
− Stop the axes in time. For this purpose, use the #24, STP or HLT command, or set the
control value to zero with the SMO command.
 Make sure that the end of the travel range is approached at low velocity.
 Make changes to the velocity, acceleration, deceleration, and load in small steps only.
 Do not deactivate the limit switches in the software.
 Test the function of the limit switches at low velocities only.
 Stop motion immediately if the limit switches malfunction.
INFORMATION
Although the M-687.UN operates quietly in theory, noise levels of up to 50 dB (A) are possible
during operation. The ultrasonic drive of the M-687.UN can also generate higher noise levels at
frequencies between 100 and 500 kHz.
INFORMATION
The repeatability of the positioning is only ensured when the reference switch is always
approached from the same side. Controllers from PI fulfill this requirement due to the
automatic direction sensing for reference moves to the reference switch.
INFORMATION
For maximum force generation, it is necessary to run the M-687.UN in when starting and after
longer downtimes; refer also to "Influence of Downtimes on the Static Holding Force" (p. 39).
The M-687.UN will generate its maximum dynamic force after running in.
 Command several motion cycles at low velocity (<50 mm/s) over the entire travel range to
run in.
M-687.UN XY Stage MP100E Version: 1.3.0 27