4.6 The Control Menu
A variety of machine control profiles can be programmed in the eP2 Controller. For example:
• Move at a constant crosshead rate until reaching a specified displacement value then terminate the test.
• Move at a constant crosshead rate until reaching a specified force value. Then hold the force value for specified amount of
time
• Cycle between two displacement limits at constant crosshead rate a specified amount of times.
1. Set Test Profile-
• CONTROL CH SegA: Select control channel, Position control or Load Control
• SegA ( ): Enter the rate for segment A and press ENT. The rate will be in units appropriate to control channel. For example if
CONTROL CH SegA is Load then the rate units will be force/time and if the CONTROL CH SegA is Position then the rate units
will be in displacement/time.
• END CH SegA: Choose load, position or time as end channel by pressing 1) key and press ENT.
• END Amt A ( ): Enter end amount for segment A and press ENT. Units will be based on value for END CH SegA. Value of
zero means segment will continue until sample break or the user stops test by pressing STOP.
• Create SegB: Press No, the program will return to the Control menu.
Press Yes, you will be prompted for SegB profile:
• CONTROL CH SegB: Select control channel, Position control or Load Control
• SegB ( ): Enter the rate for segment B and press ENT. The rate will be in units appropriate to control channel. For example if
CONTROL CH SegB is load then the rate units will be force/time and if the CONTROL CH SegB is Position then the rate units
will be in displacement/time.
• END CH SegB: Choose load, position or time as end channel by pressing 1) key and press ENT. END Amt B ( ): Enter end
amount for segment A and press ENT. Units will be based on value for END CH SegA. Value of zero means segment will
continue until sample break or the user stops test by pressing STOP.
• Cycle between segments? If no, the program will return to the Control Menu. If yes:
Number of Cycles (1-300,000): Input the number of cycles then press “ENT”. If Number of Cycles is greater than
one, the user will be asked to select on which cycles to log data. Return to Control Menu.
2. Post Test- Toggle between Stop and hold current position OR go to Home position at the end of test.
3. Jog Rate- Specify crosshead speed for manual jogging.
4. Home Location- Define home position. By default this is set to zero and home is where the position channel is zeroed. In some
tests such as certain compression test it is necessary to put cross-head a certain distance above the zero position to allow sample
placement for next test. Programming a negative value for Home Location will provide this function.
5. Home Rate- Specify crosshead rate for returning to home position.
6. Pre Load- Specify force value that when achieved, program will zero the position channel and begin executing control segment A.
Displacement will be zeroed after preload completes.
7. Pre Rate- Specify the crosshead rate for achieving Pre Load force.
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