MTS Series 793 - Manual (Page 68)

MTS Series 793 Tuning and Calibration
How to Adjust Dither
Tuning Procedures 68
3. Create a program with the function generator as follows:
4. Select the scope and set up scope parameters to display the channel’s
command and feedback signals.
Applying station hydraulic pressure can put actuators in motion.
A moving actuator can injure anyone in its path.
Always clear the actuator area before applying hydraulic pressure.
5. Apply station hydraulic pressure.
6. Press Run to start the displacement command.
7. Use the scope to observe the feedback signal.
If the feedback signal shows a smooth ramp, you do not need to adjust the
dither amplitude.
If the feedback signal shows a jagged ramp—caused by the actuator sticking
before moving—continue on to the next step to adjust the dither amplitude.
Note If you hear an unusual sound coming from the servovalve, the dither
amplitude is set too high.
C ONTROL S ETTING
Channel (automated) Select the channel whose dither
needs checking.
Type Cyclic
Wave Shape Ramp
Control Mode displacement
Target Setpoint 0 mm
Amplitude 5 mm
Frequency 0.001 Hz
Compensator None
WARNING