Control Pendent
4-3
Gravity/Pneumatic (GRAV/PNEU SWITCH)
In the gravity mode, the crosshead can be dropped from any height. When gravity mode
operation is automatic, the hoist returns the crosshead to the position of the height limit
magnet mounted on the height scale.
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.
Pneumatic Clamp Section
Clamp on/off
The clamp on/off button controls the pneumatic clamp function. When the button is set
to ON, control of the pneumatic clamp is automatically included in the normal operating
sequences.
Clear
The CLEAR button operates the center cylinder of the pneumatic clamp. It is a
momentary switch that only works in the manual mode. It is used for manual stripping of
specimens and removing debris from the center bore of the pneumatic clamp.
Crosshead Control Section
Up & Down
The UP and DOWN buttons control the hoist motor and raise or lower the latch assembly
and crosshead. These functions only work in the manual mode and are de-activated when
the system is in the pneumatic mode and the crosshead/latch is in the top position.
Arm
The ARM button readies the system in preparation for dropping the crosshead. On
systems outfitted with the pneumatic clamp, arm also causes the specimen to be clamped
in place. Arm only works if the button is illuminated. The safety enclosure doors must
be closed for the ARM button to light.
Fire
The FIRE button releases the crosshead and must be pressed after the ARM button is
pressed and before releasing the ARM button. This is a safety feature requiring that both
hands of the operator be on the pendent while the machine is dropping the weight. With
the pneumatic clamp installed there is approximately a 5-second time delay from the time
the ARM and FIRE buttons are pushed to the moment the weight is released. You must
hold down both buttons until the weight is released.
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