Calibrating a Force Sensor
Model 493.02 Controller Service
Calibration
137
During the initial calibration and tuning of your system, it may
require repeated adjustment for the tensile force command and
feedback values to match.
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
tensile force applied to the force transducer will not equal your
commanded value. You will adjust gain in the next step so that the
actual tensile force (as measured by the load standard) and your
commanded tensile force match.
Example: Suppose your actuator has a 100% tensile force rating
of -10 kN. In this step you would apply -8 kN of command, and
even though the station signals would read -8 kN of feedback, the
force standard may only read -4 kN. This shows the conditioner/
sensor pair are out of calibration.
4. Adjust Post-amp Gain on the Calibration submenu or tab to
increase the tensile force reading on the load standard until it
equals your tensile force command.
Calibrate
compression
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.
1. Exercise the force sensor.
Stand-Alone— After enabling the front panel Dial, adjust the
Setpoint to cycle the load standard readout between zero and full
tension three times. This removes sensor hysteresis. Path: Status >
Setpoint
Automated— Use the Manual Cmd slider on the Manual
Command window to cycle the load standard readout between
zero and full tension three times. This removes sensor hysteresis.
Example: When calibrating a ±10 kN range, exercise the load
standard between 0 and 10 kN.
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