VariZoom VZCINEMAPRO-JR-K2 - Manual (Page 6)

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Feeding External Cables through the Head
In some cases, you will need to feed video or other
cables through the head. To do so, simply remove
the cable covers (pictured at right, covers may
differ slightly in appearance). 4 screws secure the
long vertical cable cover, while only 2 screws
secure the short horizontal cover. Run the cables
through the pan base and tilt arm with enough
slack, and reattach the cable covers.
If using the TOC system
Connect the TOC 3A (3 axis lens drive box)
between the orange 16-PIN lens control connector
located on the head, and the grey “control”
connector located on the TOC 3A. Connect the
Lens drive motors to the appropriate connection
according to their function (zoom, focus, iris)
If using a Preston MDR2*
Connect the MDR2 box between the 16-pin LEMO connector on the front of the head,
and the appropriate command connected on the MDR2 box (refer to the manufacturer’s
instruction manual for proper connections). Connect the Preston lens motors according
to their manufacturer’s instruction manual
*** Make sure that the MDR2 is not connected to any power source (including
batteries) prior to connecting to the head. This can result in damages to the control
console. The MDR2 will get all necessary power directly from the head. ***
Balance the Camera – Although the head will hold position very well, it operates best
when the camera is balanced on the mounting platform. With heavier cameras, it is
essential, as an out-of-balance load will cause the servos to constantly fight to hold
position.
Make sure that the motor power is turned off before balancing. This will
allow you to move the tilt axis by hand. To balance the camera horizontally, you need
to place the camera’s front-to-back center of mass at the center of the mounting platform
slot. You can do this by trial and error, sliding the camera front-to-back on the mounting
platform until it stays level. The simplest accurate
way to find the camera’s center of mass is to lay a
pencil/pen on a table and try to balance the camera
on it front-to-back. The spot on the camera where it
comes closest to balancing on the pencil is the
center of mass. Place the camera’s center of mass
at the center of the mounting slot and secure the
camera with mounting screws (2 if possible). When
horizontally balanced, the platform should stay
level.
Center of Mass