Barco HDF W series, Service Manual

Page: 185 / 337

12. Start Pulse Generator
12.1 Introduction
Functionality
The purpose of the Start Pulse Generator (SPG) is to ignite the lamp with a burst of high voltage peaks. The SPG superimposes
high voltage peaks onto the normal dc start-up voltage of the lamp supplied by the Lamp Power Supply. Once the lamp is started up
and illuminating, the high voltage is removed and the lamp voltage drops to the arc voltage. The high voltage peaks are added to the
lamp voltage by a superimposing transformer which is in series with the positive connection from the LPS to the lamp. The negative
connection from LPS to lamp is direct and is connected to the chassis at the lamp side. The full lamp current passes through the
secondary of the superimposing transformer.
Parts
D
E
B
A
C
Image 12-1
A
Black marked cable lug. Has to be connected with the negative “LAMP OUT” pin of the LPS module.
B Red marked cable lug. Has to be connected with the positive “LAMP OUT” pin of the LPS module.
C Ferrite block.
D Negative connection pin from SPG to lamp house.
E Positive connection pin from SPG to lamp house.
R5905312 HDF W SERIES 24/01/2013 181