MTS Systems FlexTest SE Service Information

Tuning the Inner loop
Model 493.02 Controller Service
Servovalve Controls
77
Tuning the Inner loop
Perform inner loop tuning when initially installing a system or fine-
tuning a system that employs 3-stage valve drivers. The inner loop
proportional gain and rate derivative adjustments are the same types of
adjustments as used with the PIDF tuning controls.
Note During initial system installation, inner loop gain and rate
adjustments must be performed before tuning the servo outer loop.
For fine tuning, an initial inner loop gain adjustment may be needed
if the outer loop is sluggish.
The inner control loop is similar to a displacement control mode for
the outer loop. The Model 493.15 Three-Stage Valve Driver module
includes the electronics necessary to support the inner control loop.
Important Always tune the inner loop without the hydraulics applied to the
actuator. Perform the inner loop gain adjustments with hydraulic
pressure removed from the main spool while maintaining pressure at
the pilot stage. This prevents interaction between the inner and outer
loops.
Procedure For a detailed inner loop tuning procedure, refer to “How to Tune
Three-Stage Servovalves” in Chapter 2, Common Tasks of the FlexTest
SE User’s manual.
Program
Command
Control
Signal
Inner
Loop
Outer
Loop
HSM
Hydraulic
Power
Supply
493.15 Valve
Driver
Feedback
The innerloop (proportional)
gain and rate (derivative)
adjustments are the same
types of adjustments as the
proportional and derivative gain
adjustments of the outerloop
tuning controls.

MTS Systems FlexTest SE Specifications

General

Brand	MTS Systems
Model	FlexTest SE
Category	Controller
Language	English