318 Load Unit Operation
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Prerequisite You must have the necessary grips and/or fixturing installed. You must also have
the controller set up to control the actuator movement, and you must have a test
program defined.
When changing hydraulic grips, make sure you cap or plug the hydraulic
hoses when removed to prevent oil spillage.
Oil spillage can create an environmental concern and slippery surface that can
cause personal injury. Promptly clean up any oil that might have spilled when
hoses were removed.
The crosshead is very heavy.
A dropping crosshead can crush hands, damage grips, and smash
specimens.
Be careful when working in a crush zone. To reduce the hazards in this procedure,
observe the following:
• Ensure to set and enable displacement interlocks to limit the actuator’s
movement.
• Ensure that the crosshead is locked.
• Ensure that the columns are clean and dry.
• Keep your hands out of the crush zone except when performing the steps
needed to complete this procedure.
1. Prepare the components for specimen installation.
A. Ensure that the crosshead is locked.
B. Turn on system electrical power.
C. Turn on high hydraulic pressure.
D. Use your controller to move the actuator to its start position (usually
mid-displacement). The starting position of the actuator depends on the
type of fixtures, grips, and the test being set up.
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