Model 493.02 Controller Service
Servovalve Controls
71
Chapter 4
Servovalve Controls
Servovalve adjustments optimize the interface between the controller
and the servovalve.
Contents Setting the Servovalve Polarity 73
Getting Things Ready 74
Adjusting Valve Balance 75
Dither 76
Tuning the Inner loop 77
Inner Loop Signals 79
Hydraulic systems Hydraulic systems use servovalves to control the actuator. The
following complement of valves have different Drive panels:
• 252 Valve—represents the MTS Series 252 Servovalve.
• Dual 252 Valve—represents two MTS Series 252 Servovalves
mounted to the actuator manifold.
• 256/257 Valve— represents the MTS Series 256 and Series 257
Servovalves. Although these valves are different, they use the
same adjustments. These servovalves have inner control loops.
Adjustment
prerequisites
You should run a small program to warm up the system hydraulic fluid
and servovalve before you adjust the valve balance, dither, or inner
loop.
Refer to “How to Warm Up the Station Hydraulics” in Chapter 2,
Common Tasks of the FlexTest SE User’s manual for a detailed
procedure.
When to adjust You make servovalve adjustments to optimize the valve response to
your program commands.
Normally, servovalves are balanced and tuned at the factory, and then
optimized by the MTS service engineer who installs your system.
However, if you change or replace a hydraulic component or notice
erratic servovalve response during a test, you may need to readjust
your servovalve settings.
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