MTS Series 793 - Manual (Page 102)

MTS Series 793 Tuning and Calibration
How to Perform Advanced Tuning Techniques
Tuning Procedures 102
Note These signals are not available to the built-in meters or scope.
How to Use Error to Tune I Gain
Note This procedure requires the optional Scope, or an external oscilloscope.
This procedure pertains to manually tuning the I Gain control using the Error
signal.
To perform this procedure for the displacement control mode, follow the
procedure beginning on
page 71 , then use it as an alternate method to “Adjust the
I Gain tuning control.” on page 75.
To perform this procedure for the force control mode, follow the procedure
beginning on
page 76 , then use it as an alternate method to “Adjust the I Gain
tuning control.” on page 80.
Setting up the Scope Set up the Scope to view Command and Error, and select a Trace Time of 5
seconds. Also, ensure Auto-Scale is on (it is on by default).
Inner Loop Signals
S IGNAL D ESCRIPTION
Valve Current The final output to the servovalve. The voltage
represents the current output (10 V DC=50 mA;
standard).
Valve Balance The amount of valve balance introduced by the Valve
Balance control on the Valve tab of the Drive page.
Inner loop Cmd The input signal to the 3-Stage Valve Driver (the test
program command).
Inner loop Err The difference between the Inner loop Command
and the Spool Position signal.
Spool Position The Conditioner Out signal summed with the Spool
Zero signal.
Spool Zero The amount of offset introduced by the Offset control
on the Valve tab of the Drive page.
Conditioner Out The conditioned feedback signal from the servovalve
LVDT.
Ground The signal common.