Operation Manual Part 3

Digital Liquid Cooled UHF
TV Equipment
Description / Test points / Location of units
9946 V1
45321648.01 104 A E
preliminary
97 / 131
Numéro / Number Doc. Rev. Lan
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16/06/2006
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Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON.
3.12. The mains plate, 61391643
3.12.1. Outline
The Mains Distribution Panel takes in the external main supply and provides mains feeds together with
protection systems for the various transmitter sub-units and the incoming mains supply.
The Mains Distribution Panel has safety devices to protect against abnormalities in the incoming main
supply as follows:
♦ main circuit breaker Q1, which isolates the mains supply from the equipment and is the principal
safety switch. Moreover it protects the transmitter against overload conditions.
♦ over voltage protection E1 module.
The status conditions of the incoming main supply are transmitted to the loop protection system and
the Central Processing Unit by data from the following sensors:
♦ a contact Q1-1 on the main circuit breaker Q1,
♦ a mains monitoring relay K1 which detects the presence, absence and phase inversion of the three
phases of the incoming mains supply.
♦ a mains monitoring relay E1 which detects the lighting protection of the three phases of the three
phases of the incoming mains supply.
The Mains Distribution Panel provide selective protection for the installation so that only the protective
device immediately ahead of the fault will be activated :
• Circuit breaker Q6 : protects the mains feeds of the very low voltage power supply for the
Control Processor Unit via the management rack,
• Circuit breaker Q7 : not used,
• Circuit breaker Q8 : protects the mains feeds of external exhaust fan EV3.
• Circuit breaker Q5 : protects the mains feeds of an uninterruptible power supply (UPS) -
option,
This configuration, with an uninterruptible power supply (UPS) is an option. Without this
element, Q5 is not used and the mains come from “emergency mains input” (see “LV
distribution” drawing for TB1 terminal block configuration )
• Circuit breaker Q2 : protects the mains feeds of Sirius 1,
• Circuit breaker Q3 : protects the mains feeds of Sirius 2,
• Circuit breaker Q4 : protects the mains feeds of the very low voltage power supply for the
screen of the control panel via the management rack