Instron 1000KPX-J3D, Руководство по эксплуатации

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37
Mount fixtures
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Adjust the position of a J3-style crosshead
Operation of controls
The crosshead lift and lock cylinders are operated by controls on the lifts and locks control unit that is
mounted to the right-hand crosshead lift cylinder. The controls consist of two lifts control valves and a
locks control valve.
•
Lifts control valves - The
RAISE
and
LOWER
valves (1 and 3, Figure 8 ) control the operation of the
crosshead lift cylinders. Opening the
RAISE
valve pressurizes the crosshead lift cylinders to raise
the crosshead (1). Opening the
LOWER
valve depressurizes the crosshead lift cylinders to lower the
crosshead (3). Closing both valves stops movement of the crosshead. The crosshead must be
unclamped (using the locks control valve) before the crosshead can be adjusted. Turn knob
counterclockwise to open and clockwise to close.
Warning
•
Locks control valve - The
CLAMP/UNCLAMP
valve (2) controls the operation of the crosshead lock
cylinders. The valve must be fully closed for testing. Only open the valve to depressurize the
crosshead lock cylinders when the crosshead is to be adjusted. Turn knob counterclockwise to open
and clockwise to close.
Procedures vary depending on frame model, refer to the appropriate procedure for your model.
Caution
Improper use of the crosshead lift cylinders can cause damage to the frame or installed
accessories! Do not position the crosshead at either extreme of the lift cylinders (fully
extended or fully retracted) unless specifically directed to do so by procedures in this
manual. This can cause the crosshead to become unlevel and result in the following
conditions:
• Any fixture or specimen installed in the frame may not align.
• If the crosshead is positioned with the crosshead lift cylinders fully extended and a tension or
compression load is applied, the crosshead could slip until it reaches a level position.
Even with the HPS shut down, the crosshead lock cylinders and the crosshead lift cylinders
will depressurize if their respective control valve is opened (the CLAMP/UNCLAMP valve or
LOWER valve). If both valves are opened, the crosshead will lower. To stop movement of
the crosshead, close the LOWER valve. Closing only the CLAMP/UNCLAMP valve will not
stop movement of the crosshead.
Figure 8. The lifts and locks control unit.
1. Lifts control valve -
RAISE
2. Locks control valve -
CLAMP/UNCLAMP
3. Lifts control valve -
LOWER
1
3
2