MTS Series 793 Utility Software - Manual (Page 30)

The inner loop (like the outer loop), has gain and rate controls that can be adjusted to optimize
performance. The inner-loop is tuned at system installation, and requires periodic fine tuning when
the outer-loop becomes sluggish.
Item Number callout in graphic
Feedback
1
Outer Loop 2
Inner Loop 3
Hydraulic Service Manifold (HSM) 4
Hydraulic Power Supply 5
Control Signal 6
493.15 Valve Driver 7
Program Command 8
The innerloop (proportional) gain and rate (derivative) adjustments are the same types of
adjustments as the proportional and derivative gain adjustments of the outer-loop tuning controls.
Where to Find Valve Balance Procedures
Mechanical valve-balance procedures
For two-stage servovalves, the mechanical valve balance procedure is included in the Series 252
Servovalve Product Manual (PN 011-182-906), which is typically included in the system
documentation set.
16 MTS Series 793 Utility Software
Create and Edit an HWI File