MTS Series 793 - Manual (Page 152)

MTS Series 793 Tuning and Calibration
Displacement Sensor Calibration
Calibration Procedures 152
Note If the actuator response is sluggish and/or the signal value does not
match the command, you will need to adjust the tuning of this control
mode. Increase the proportional gain (P Gain on the Tuning menu) to
correct sluggish actuator movement. Increase the reset integration value
(I Gain) to help the feedback match the command.
At this point, unless the conditioner is already in calibration, the actuator’s
physical retraction will not equal your commanded value. You will adjust
gain in the next step so that the actuator’s physical retraction and your
commanded retraction match.
Example: Suppose your actuator has a 100% retraction of -10 cm. In this
step you would apply a -8 cm command, and even though the station signals
would read -8 cm of feedback, the actuator may retract only -4 cm. This
shows the conditioner/sensor pair are out of calibration.
9. Adjust gain to retract the actuator until it equals your retraction command.
Standalone FlexTest SE Controllers: Select Setup > Disp > Calibration
> Cal Type > Gain/Linearization > Post-Amp Gain
Automated Controllers: Adjust the Post-Amp Gain slider control on the
Calibration tab
Adjust Post-Amp Gain until your dial indicator or other readout device
shows that the actuator’s physical retraction equals your retraction
command.
10. Record dial indicator and conditioner feedback readings at predetermined
retraction command points.
Note After shutting down system hydraulics, you will enter these recorded
readings on the Linearization Data window.
Standalone FlexTest SE Controllers:
A. Use the front panel Dial to adjust the Setpoint for a 0% command.
B. Record the dial indicator value at 0% command.
C. Record the corresponding conditioner feedback reading on your record
sheet.
D. Use the Dial to adjust the Setpoint for a -2% retraction command.
E. Record the dial indicator value and conditioner feedback at the -2%
row of your sheet.