Calibrating an LVDT
Model 493.02 Controller Service
Calibration
117
control mode. Increase the proportional gain (P Gain on the Tu n i n g
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 calibrated, the
actuator’s physical extension will not equal your commanded
value. You will adjust Delta K in the next step so that the
actuator’s physical extension and your commanded extension
match.
Example: Suppose your actuator has a 100% extension 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
extend only 4 cm. This shows the conditioner/sensor pair are out
of calibration.
5. Adjust Delta K to extend the actuator until it equals your
extension command.
Adjust Delta K until the dial indicator or other readout device
shows that the actuator’s physical extension equals your extension
command.
Record data points The accuracy tolerance of your data depends on the manufacturer of
your sensor. Your sensor should include a calibration data sheet that
shows the data point tolerance. Sensors from MTS include a sensor
calibration data sheet that shows the data points as it was calibrated.
1. Record the data points for LVDT extension.
Stand-Alone:
A. Adjust the Setpoint to achieve zero command.
B. Adjust the dial indicator for a zero reference.
C. Adjust the Setpoint to 20% extension and record the dial
indicator reading. Repeat this step for 40%, 60%, 80%, and
100% actuator extension.
Automated:
A. Adjust the Manual Cmd slider to achieve zero command.
B. Adjust the dial indicator for a zero reference.
C. Adjust the Manual Cmd slider to 20% extension and record
the dial indicator reading. Repeat this step for 40%, 60%, 80%,
and 100% actuator extension.
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