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LIMIT SWITCHES
End-of-travel limits
Each axis is equipped with end-of-travel limit switches. End-of-travel limits are classified by their function, either
as normal limits, or overtravel limits. The normal limits stop motion in the selected direction, but permit motion in
the opposite direction. Each normal limit is backed up by an overtravel (or ultimate) limit; striking an overtravel
limit will cause the starter control power be cut off, preventing all motion of the winch. This is not a normal
situation, and a careful inspection of the winch must be conducted to determine the reason an overtravel limit
switch was activated. A maintenance procedure is required to clear this condition.
Both normal limits and overtravel limits are tied into the system control in all modes of operation, whether
operating from the main control system or from the maintenance controls on the motor control cabinet.
Limit switch types
Limit switch functions can be accomplished either with direct-struck limit switches, or with rotary limit switches.
Rotary limit switches are mechanically coupled to the winch drive mechanism. Each rotary limit switch has four
elements (up overtravel, up, down, and down overtravel). Direct-struck limit switches are struck by a piece of the
driven mechanism (e.g. a moving drum flange, or a cam mounted on the counterweight arbor, cable clew, or lift
guide).
CONTROL STATION
SceneControl 100 Control Station
Design, Manufacture and Installation of Theatrical Equipment Worldwide
(315) 451-3440
Fax (315) 451-1766
Rev 1: February 13, 2007
SCENECONTROL 100 OPERATING INSTRUCTIONS
The
SceneControl
Station is the main control point for
the motorized rigging system.
contains the following controls:
POWER keyswitch - Used to turn the
control system power on or off. Key
can only be removed when switch in
the off position.
EMERGENCY STOP - red latching
mushroom-head button– pushed in to
initiate an emergency stop condition,
pulled out to release and enable
normal system operation.
UP,
DOWN,
buttons - momentary-action buttons
which are pushed and held to execute
an action, previously selected on the
display screen.
SPEED
-
joystick control, used to speed up or
slow down the execution of an action
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Control
It
and
GO
TARGET
spring-return-to-center
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