MTS Series 793 - Manual (Page 226)

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Valve Tab Settings for Three-Stage Valve Drivers
Description Item
Displays the valve driver’s fullscale minimum and maximum output
values. Fullscale Min/Max
Sets the polarity of the valve drive signal to Normal or Invert. Polarity
Polarity cannot be changed with station pressure on.
Compensates for minor mechanical imbalances in the servovalve. Valve Balance
Adjusts the amplitude of the dither signal. Dither Amplitude
Adjusts the dither signal frequency for Model 493.15 Three-Stage
Valve Drivers. Dither Frequency
Specifies the ratio between the two unequal surface areas of a
single-ended actuator piston (double-ended actuators have equal-area Output Delta-K
(also known as piston area ratio)
piston surfaces). This ratio is used to scale the valve drive signal so
it is the same for positive and negative commands of the same
magnitude.
The actuator piston parameter is set as a direct ratio. For example, if
the area ratio between the two piston ends in 1:1, set the parameter
to 1. If the area ratio is 2:1, set the parameter to 2, and so on.
Allows you to define maximum and minimum limits of the output
hardware resource, typically to prevent applying voltages to external
devices that exceed their specifications. Output Limit Enable
Specifies independent maximum and minimum output limits. Output Min/Max
On TestStar IIs controllers, monitors signals through the J48 Service
connector. Service Port Output (TestStar IIs,
TestStar IIm, FlexTest GT
Controllers)
On TestStar IIm and FlexTest GT controllers, monitors signals through
the Model 493.40 I/O Carrier Card’s J3 Service Connector.
Select an inner loop signal to monitor:
Valve Current—Final output to the servovalve expressed in voltage.
The current-to-voltage relationship is 10 V DC = 50 mA (or 25 mA),
depending on the .hwi file setting.
Inner Loop Command—Input signal to the three-stage valve driver.
Demod Filter Output—The analog output of the demodulator prior to
gain.
Spool Offset—Signal is summed with spool position to remove any
DC offset. ±10 V represents ±4 V of zero summing.
Spool Position—The Conditioner Out signal summed with the Spool
Zero signal.
226 MTS Series 793 Control Software
Station Setup