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17
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 posi-
tion and allow the lever to extend under the spring force.
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.
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
Pressurization Graph
, mark the pay-
load 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 22 for more detail).
WARNING! 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.
NOTE:
The pressure gauge only displays full system pressure when the control valve
(26)
is
set to WORK.
NOTE:
Reducing pedestal pressure below 3.5 bar (50 psi) may cause a pressure leak.