1-18
V
ARI
*L
ITE
®
-
VL4
W
ASH
L
UMINAIRE
S
ERVICE
M
ANUAL
CONFIDENTIAL 02.9628.0010
7-Oct-97
Universal Control Board (UCB)
The universal control board is a dual-processor control board. One
processor is the main controller. It communicates with the console via the
communications link, executes commands it receives, operates the pan and
tilt servos, and issues stepper motor commands to the second processor,
whose sole purpose is to control the stepper motors.
Interface Board (IFB Located on UCB)
The interface board contains the circuitry to interface the microprocessors
on the universal control board to the mechanisms of the luminaire such as
pan and tilt servo systems, and stepper motors controlling color, dimmer,
diffuser, and focus mechanisms. In addition, it serves to control the
voltage power level of the lamp power supply.
Arc Power Supply Plus (APS+)
The arc power supply plus provides controlled square-wave current,
ignition voltage, and operating voltage required by the arc lamp.
1.5.2.2 Bulkhead Assemblies
Rear Bulkhead and Bulb Mounting Assembly
The rear bulkhead and bulb mounting assembly contains the lamp and the
lamp alignment controls. The knurled knob alignment controls aid in the
redirection of the lamp in the X and Y planes.
Blue/Amber Bulkhead (BAB)
This assembly contains two sets of glass dichroic filters and the reflector.
Two motors control the angle at which the filters intersect the light beam,
thereby producing the desired color.
Dimmer/Filter/Douser Assembly (DFD)
The unit contains a dimming iris assembly, the magenta dichroic filter
motor, and the douser for fully blacking out the light beam.
Diffuser Assembly (DIFF)
The diffuser assembly consists of two sets of five diffuser panels. There
are three types of diffuser panels, each having a different diffusion pattern.
Ignitor Board Assembly (IGN 4)
The ignitor PCB is mounted remotely from the arc power supply, inside the
luminaire head. The ignitor circuit generates up to 3300 VDC, which is
applied to the spark gap. When the 2.5 kV spark gap fires, the pulse is
stepped-up to 10 kV and the start pulse is applied to the arc lamp.
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