MTS Series 311 Load Frame - Manual (Page 80)

Load Unit Addendum 80 Addendum
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:
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. Apply HPU system high hydraulic pressure. Apply load unit station
low hydraulic pressure.
D. If the system has a 494 based controller, enable the Gate Interlock.
E. Set the actuator velocity limiting switch to (restricted flow).
F. Enable the handset and use the thumbwheel 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.
CAUTION
WARNING