el Limit Switches Located inside the frame base. There are first and second level limit
switches that stop the moving crosshead. When a first-level limit switch
is activated, the crosshead stops. A status message appears on the
computer. To restore operation, use the jog buttons on the front panel to
move the crosshead away from the limit stop. Refer to “Moving Off a
Crosshead Limit Stop” on page 7-6 for details.
The second-level switch is a backup in case the first-level switch
malfunctions. When a second-level switch is activated, it disables the
drive motor relay and the crosshead stops. Operation of a secondary
overtravel limit indicates that the primary overtravel limit has failed to
stop the crosshead. This is a serious condition. Identify and resolve the
condition that caused the secondary overtravel limit to trip before you
use the testing system again. Contact your local Instron Professional
Services department for assistance.