MTS Multipurpose Elite - Manual (Page 27)

Offsets
If an offset is applied to the station, the test will respect that offset and run assuming the offset position is
“zero”. For example, if the station has an offset of 2 mm axial displacement, and the test commands the
actuator to ramp to zero, the actuator will ramp to 2 mm axial displacement.
Caution:
If you run a test that assumes an offset that does not exist on the station, you may receive
unintended test results, which may result in unexpected actuator movement.
Unexpected actuator movement can result in injury to personnel or damage to the
equipment and the specimen.
Always be aware of the offsets that are set on the station before running a test.
3.2.6.2.0 C-Stop (Controlled Stop) Interlock Action
The C-Stop Interlock is an action you can assign to specimen and fixture limit detectors during system setup.
For example, when you right-click the thumb control used to adjust limits in the Set Up node, a context menu
appears with C-Stop Interlock in the Actions list, along with other options, such as Interlock, Indicate, and
so on.
You can also assign the C-Stop Interlock action to limit detection activities when designing a test.
C-Stop Interlock Configuration
The C-Stop Interlock action is configured to Hold At Level in the Stable Displacement control mode with
the Zero the Output option enabled.
Important:
The C-Stop Interlock action configuration is set with MTS controller software and should not be
changed for typical operations. Contact MTS for information about changing the C-Stop Interlock
action configuration.
C-Stop action versus Interlock action
The primary benefit of the C-Stop Interlock action is that when it is triggered, the controller performs a control
mode switch to stable displacement and the actuator is held in place. The C-Stop Interlock action does not
remove power from the actuator.
The C-Stop Interlock action is appropriate for instances in which limiting actuator movement after the action
is triggered is the primary objective.
In contrast, when an Interlock action is triggered, the controller removes power from the actuator, which
allows the actuator to continue to fall until the mechanical brake engages. This may result in actuator movement
greater than 30 mm between the time the detector limit is triggered and when the mechanical brake engages.
The Interlock action is appropriate for instances in which removing actuator power, regardless of incidental
actuator movement, is the primary objective.
Multipurpose Elite Test Design Guide 27
3.0 Designing a Test