MTS Series 793 - Manual (Page 100)

MTS Series 793 Tuning and Calibration
How to Perform Advanced Tuning Techniques
Tuning Procedures 100
1. Set the Valve Balance to zero.
Standalone FlexTest SE Controllers: Select Setup > Output (3-stage) >
Valve Balance
Automated Controllers: On the Drive panel, click the Valve tab, then set
the Valve Balance to zero.
2. Ensure that the Offset control is set to zero.
Standalone FlexTest SE Controllers: Select Setup > Disp > Offset/Zero >
Manual Offset
Automated Controllers: Click the Conditioner tab on the Drive panel,
then check the Offset setting.
3. Apply hydraulic pressure.
Do not remove the LVDT adjustment locknut or assembly when adjusting
the servovalve LVDT spool position.
If it is removed, hydraulic fluid will spray from the servovalve at full pressure. You
should refer to the servovalve product manual to identify the main stage LVDT
spool adjustment.
4. Loosen (but do not remove) the LVDT locknut.
5. Adjust the LVDT in or out of the servovalve to provide a zero spool position
signal.
6. Tighten the locknut while holding the LVDT in position.
How to Monitor Inner Loop Signals
Note The following procedure does not apply to FlexTest IIm Controllers, see
page 101 .
1. Connect a service calibration cable package (MTS part number 100-026-
213) to connector J3 Service on the I/O carrier module.
2. Connect a DVM or oscilloscope to the appropriate BNC Output Channel
on the service cable, depending on which slot the valve driver occupies in
the I/O Carrier module.
WARNING