MTS TestLine - Manual (Page 66)

3. Verify polarity.
a) Move the actuator about 10 mm in the positive direction. The actuator should extend.
Note: If a displacement limit trips, see If Necessary, Recover from a Tripped Displacement
Limit (p. 113).
b) Move the actuator about 10 mm in the negative direction. The actuator should retract.
c) If the polarity is incorrect, have the engineer on the project correct the system polarity.
Perform Basic Displacement Performance Tuning
While conservative tuning parameters were set earlier to provide rudimentary control, it is necessary to
tune the system to ensure that you have a tight command/feedback loop. Tuning ensures that control
software is properly matched to the specific components that make up the complete system. Displacement
tuning is done now, without the specimen installed. Force tuning will be done later, after the specimen is
installed. To perform basic displacement performance tuning:
Warning :
Displacement tuning requires setting of parameters that may cause instability.
Instability may cause unexpected actuator movement that can result in equipment damage
or injury.
When displacement tuning, always ensure that the actuator area is completely clear. Ensure
that the actuator can go to full travel in either direction without contacting anything.
1. Disable manual command.
This allows the function generator to control the system.
a) In the Station Manager main window, click the Manual Command button.
b) Click to clear (uncheck) the Enable Manual Command check box.
66 | MTS TestLine Test System Operation
Running the Example HCF Test