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Air Kit Option
noid activated, and open when the solenoid valve is deac-
tivated and air pressure released.
The Pneumatic Control Box is mounted on one of the
columns of the load frame. This unit contains the sole-
noid valves and a small printed circuit board. It is the
hub of the pneumatic and electrical connections; one
hose provides pressurized air, and two hoses provide
controlled pressure to the upper and lower grips. One
electrical cable connects to the footswitch, and another
connects to the load frame.
The footswitch assembly contains two foot pedals for
opening and closing the grips. Each pedal operates a mo-
mentary electrical switch, which in turn operates the so-
lenoid valves. The role of the CLOSE pedal in the
closing sequence for the grips depends on the mode of
operation selected, but the OPEN pedal always causes
both grips to open.
Operation
The Air Kit Option operates in several modes, selected
from the Console front panel or through the GPIB Com-
puter Interface from an external computer. The functions
are listed in Table 6-11, along with their default settings.
In addition, one other function is the Pretension Hystere-
sis level, which is set at 50% of the Pretension level.
This value is fixed, and cannot be adjusted.
Grip Control Enable/Disable overrides all of the other
settings. It must be enabled for any of the automatic fea-
tures to operate. This control provides a convenient
means of disabling automatic operation while maintain-
ing a combination of automatic settings for later reuse.
6-45
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