MTS Landmark TWX - Manual (Page 152)

Decommission
The decommissioning process is performed when the system is going to be moved or taken out of service.
Disassembly is required when performing either of these tasks.
1. Remove the specimen and fixtures. Large grips should be removed if the load frame is going to be
tipped over.
2. Move the actuator piston rod down to its lowest position, fully into the cushion.
3. Lock the crosshead.
• If the unit has hydraulic lifts, move the crosshead to its lowest position and torque the manual
crosshead locking bolts. However, if the unit is going to be moved, the crosshead might need to be
locked at a higher position to accommodate moving the unit.
• If the unit has manual locks, select a crosshead position that will accommodate moving the unit and
torque the manual locking bolts.
4. If there are hydraulic grips on the unit, ensure that the hydraulic pressure is relieved from the grip and
release ports and hoses on both grips.
On large grips, position the wedge chambers to the lowest positions, similar to the unit’s piston rod as
noted above.
If the unit has a remote Model 685 Grip Supply, cycle the grip/release handles while reducing the
pressure setting to release all pressure from the grips and hoses. Turn off the Model 685 Grip Control
and disconnect electrical power. Remove the hoses.
If the unit has an integrated grip control (Model 318 and MTS Landmark) on the frame control panel,
move the grip/release handle to the null position and release the pressure using the pressure release
valves on the grip manifold under the control panel.
5. Turn off the HSM.
6. Turn off the HPU or shut off valves if the unit is connected to a hard line distribution system. Allow time
for pressure to bleed off before closing the return shut off valve.
7. Remove the accumulator charging pressure from all accumulators.
8. Hydraulic locks can retain stored pressure. Manually bleed them if the unit is going to be stored or
disassembled.
9. Isolate the system hydraulically.
To isolate the system from hydraulic power requires that the hydraulic supply valve or control is closed.
Depending on your system configuration, there is either a manual valve that must be moved to its Off
position or an electronically controlled supply valve that must be turned off. Electronically controlled
valves are either turned off using local controls or the system software interface controls.
10. Isolate the system from electrical power.
When the system electronics, control software, and the system PC are powered down, turn off the
system’s main electrical supply and disconnect all cables.
152 | MTS Landmark Test System Operation
Decommissioning