MTS Series 793 - Manual (Page 144)

MTS Series 793 Tuning and Calibration
Displacement Sensor Calibration
Calibration Procedures 144
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 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.
3. Adjust gain to retract the actuator until it equals your retraction command.
Adjust Post-Amp Gain until your dial indicator or other readout device
shows that the actuator’s physical retraction equals your retraction
command.
Note This procedure assumes a positive command extends the actuator and a
negative command retracts the actuator. If not, use the opposite polarity
for any values given.
4. If applicable, repeat steps 1 - 3 for all ranges.
Example: Suppose you have an actuator with a full-scale capacity of ±10 cm
and ranges of ±10 cm, ±5 cm, ±2 cm, and ±1 cm. In this case you would
repeat this process and calibrate retraction at 80% of each range (-8 cm, -4
cm, -1.6 cm, and -0.8 cm).
Note Some systems do not provide or require multiple ranges, such as those
using full-range conditioners (e.g., Model 493.25 DUC module). In this
case, only one range is used (typically 100%).
Calibrate actuator
extension
Note This procedure assumes a positive command extends the actuator and a
negative command retracts the actuator. If not, use the opposite polarity
for any values given.
5. Apply an extension command that is 80% of the full scale range
Standalone FlexTest SE Controllers:
A. Enable the front panel Dial.
B. Use the Dial to adjust the Setpoint for 80% of the full scale range.