Performing a Test
6-3
Operation
12. Remove the specimen.
13.
Press the CLEAR switch to raise the center piston on the pneumatic clamp, use the
wire brush provided to clear away debris.
Automatic Mode
WarningWarning
Install the “H” bar to prevent the crosshead from falling before workingInstall the “H” bar to prevent the crosshead from falling before working
within the safety enclosurewithin the safety enclosure
To operate the 8250 machine in gravity driven automatic mode:
1.
Attach the desired weight set to the crosshead.
2.
Set the control pendent switches to AUTO, GRAV and, if a pneumatic clamp is
installed, set the clamp ON/OFF switch to ON. When the AUTO switch is pressed,
the crosshead automatically rises to the height determined by the magnetic switch.
3.
Set the pneumatic assist air pressure using the regulator on the top of the rear motor
enclosure.
4.
Place the specimen in the specimen support fixture.
5.
Remove any tools, other foreign objects, and the safety "H" bar from the enclosure
and close the doors. The ARM button illuminates.
6.
Press and hold the ARM button. The audible alarm sounds and the pneumatic clamp
(if installed) closes.
7.
While still holding the ARM button, press the FIRE button. The latch hook opens
allowing the crosshead to fall and strike the specimen.
8.
When a pneumatic clamp is installed, the system automatically strips the specimen
from the tup after the test.
9.
The latch assembly automatically retrieves the crosshead and raises it back to the
height of the magnetic switch.
10.
Insert safety "H" bar.
11.
Remove the specimen.
Pneumatically Assisted Operation
In the pneumatic mode, the crosshead is pneumatically accelerated to higher velocities
than can be achieved in the gravity driven mode. The crosshead must be in the top
position for pneumatically assisted drops. As a result, when pneumatic mode operation is
automatic, the hoist returns the crosshead to the top position.
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