Vinten Osprey Light Pedestal Mode D'emploi page 17

English
Depress the control valve (26) against the spring force, and rotate the lever fully clockwise to a hor-
izontal position. The control valve (26) will remain in a depressed position.
Refer to 'Pressurizing the pedestal using the built-in pump' on page 17 for self-pumping instructions.
NOTE: Set the control valve (26) to PUMP mode when transporting the pedestal, to isolate the
moving column (5) from internal pressure. Refer to 'Transportation and storage' on
page 22 for more information.
Transition
Transition mode gradually applies the full pedestal pressure to the moving column (5) at a safe rate. To
select TRANSITION mode, proceed as follows:
Fully extend the moving column (5).
Depress the control valve (26) against the spring force, rotate the lever to the vertical position and
allow the lever to extend under the spring force.
WARNING!
Work
Work mode applies the full pedestal pressure to the moving column (5) to balance the payload. To select
WORK mode, proceed as follows:
Ensure the moving column (5) is fully extended.
Depress the control valve (26) against the spring force, and rotate the lever fully counter clockwise
to a horizontal position, allowing the lever (26) to extend under the spring force. The control valve
(26) will remain in an extended position.
NOTE: The pressure gauge only displays full system pressure when the control valve (26) is
set to WORK.
Pressurizing the pedestal
The Osprey Light pedestal may be pressurized manually using the self-contained pump, Vinten portable
pump (Part No. 3357-3) or an external pressure source.
A correctly pressurized pedestal will balance its payload, allowing movement over the full on-shot stroke
of the moving column with minimum effort, and will maintain its position when the steering ring is released.
Balance can be adjusted by adding or removing trim weights (28) to the weight tray pockets (25), or venting
some of the internal pressure.
Ascertain the payload to be fitted to the pedestal (payload = pan and tilt head, camera, trim weights, lens
and all ancillary equipment). Referring to the graph (Fig 4), mark the payload on the horizontal axis then
strike a vertical line from the load figure to the balance line. At the intersecting point, strike a horizontal line
to the vertical axis and read off the required gas pressure.
The pedestal pressure must be reduced to a maximum of 3.5 bar (50 psi) before fitting the pan and tilt head
(refer to 'Fitting and balancing the load' on page 19 for more detail).
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Place the control valve (26) in the TRANSITION position for at least 10-
SECONDS when switching between PUMP and WORK modes, to prevent
the moving column (5) rising rapidly.