MTS Series 793 Application - Manual (Page 157)

Determine Which Processes Are Needed
MTS MultiPurpose TestWare® Creating a Practice Test Procedure 157
How these processes
work
The following illustrates Steps 1 - 3.
4. Determine which processes are needed to control the fan.
This test requires a Group process to provide the logic for switching the
cooling fan on-and-off. The Group process contains four individual
processes:
• A Data Limit Detector process to monitor the physical specimen’s
temperature and trigger the next process when the temperature reaches
75°C.
• A Digital Output process to turn the fan on to cool the physical
specimen.
• Another Data Limit Detector process to monitor the physical
specimen’s temperature and trigger the next process when the
temperature drops to 50°C.
• Another Digital Output process to turn the fan off. Finally, to create
continuous fan control during the test, we should specify that when the
fourth process in the group is done, the first process begins again.
Time
The first Segment
Command process
applies a mean force to
the physical specimen. The second Segment
Command process returns
the applied force to zero.
The Cyclic Command process cycles
the physical specimen to fatigue it.
The Peak/Valley Data Acquisition
process acquires peak/valley data while
the physical specimen is being fatigued.
The Digital Input Detector process
detects if and when the breakwire
severs while the physical specimen is
being fatigued.