MTS Systems FlexTest SE Service Information

Model 493.02 Controller Service
Tuning the Inner loop
Servovalve Controls
78
Zero the Spool Position Signal
This task matches the electronic null of the spool position signal with
the mechanical null position of the servovalve pilot spool.
During inner loop tuning, it may be necessary to complete this
procedure if the spool position signal voltage is not approximately
equal (though opposite polarity) at opposite endcaps of a servovalve.
1. Set the Valve Balance to zero.
Stand-Alone— Path: Setup > Output(3-stage) > Valve Balance
Automated— 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.
Stand-Alone— Path: Setup > Disp > Offset/Zero > Manual
Offset
Automated— 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.
WARNING

MTS Systems FlexTest SE Specifications

General

Brand	MTS Systems
Model	FlexTest SE
Category	Controller
Language	English