MTS Series 793 - Manual (Page 96)

MTS Series 793 Tuning and Calibration
How to Perform Advanced Tuning Techniques
Tuning Procedures 96
D. Readjust Conditioner > Gain until the Meter reads -10 V DC.
E. Return Conditioner > Polarity to its original setting.
Automated Controllers:
In the Drive panel Conditioner tab:
A. Reverse the Polarity setting to drive the inner loop spool into one of
the end caps.
B. Adjust Gain until the meter reads approximately -8 V DC.
C. Adjust Phase until the meter displays maximum voltage.
The phase adjustment matches the phase of the inner loop LVDT
feedback with the 10 kHz demodulator reference signal. This
adjustment provides a maximum output for the maximum LVDT spool
position offset.
Note This adjustment must be set for the initial calibration, servovalve
replacement, cable replacement, or valve driver replacement. Once the
phase is correctly set, readjustment is not necessary during routine
calibration.
D. Readjust Gain until the meter reads -10 V DC.
E. Return Polarity to its original setting.
8. Produce a Spool Position output signal of +10 V DC with the spool driven
into the opposite end cap.
Standalone FlexTest SE Controllers:
A. Reverse the Conditioner > Polarity setting to drive the inner loop
spool into the other end cap.
B. Check the Meter. It should read +10 V DC (±0.5 V DC).
If the voltage is correct, proceed to the next step in this procedure.
If the voltage is off by more than 0.5 V, you may need to mechanically
center the pilot spool. Complete this procedure, then recheck spool
position voltages at each endcap before you resume inner loop tuning.