MTS 318 Load Unit - Manual (Page 69)

318 Load Unit Operation 69
318 Load Unit: Adjust the Grips’ Clamp Rate
The clamp rate determines how fast the grip can clamp a specimen.
1. Ensure that both the upper grip control and lower grip control are in the
unclamp position.
2. Turn on electrical power at the test controller.
3. Turn on low or high hydraulic pressure.
4. If needed, move the crosshead or actuator so that the dummy specimen can
be easily installed in the lower grip.
5. Turn the Rate control fully clockwise for the slowest clamp speed.
The crosshead is very heavy.
A dropping crosshead can crush hands, damage grips, and smash
specimens.
Be careful when working in a crush zone. Observe the following to reduce the
hazards in this procedure:
• 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.
318.25 20 N·m
(15 lbf·ft) 244 N·m
(180 lbf·ft) 271 N·m
(200 lbf·ft) 271 N·m
(200 lbf·ft)
318.50 20 N·m
(15 lbf·ft) 244 N·m
(180 lbf·ft) 271 N·m
(200 lbf·ft) 271 N·m
(200 lbf·ft)
* This step ensures uniform tightness.
L OAD U NIT S TEP 1 S TEP 2 S TEP 3
S TEP 4
*
Rate
Faster
Slower
WARNING