Operation Manual Part 1

Digital Liquid Cooled UHF
TV Equipment
Detailed operational description
9946 V1
45321648.01 104 A E
preliminary
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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.
Delays and time lags in equipment
The back-up functions are totally hardware based; the CPU board stores data according to the type of
event and provides a fault display system.
(1) (1)
(1)
(1)
(1) (1) (1) (1)
CPU ignores faults
No fault
Faulty parameter
Fault appears
Fault confirmed by
CPU for storage
and display
(1) : Parameter polling period (approx. 300 ms)
: Parameter polling by CPU
The CPU confirms a parameter fault in the transmitter (not in the exciter) after it has been detected
during three successive polling periods.
Three to four seconds after its appearance a fault will be displayed and stored in the logbook.
After a start command from the CPU a delay of 20 seconds (CPU software) is applied to the detection
of transmitter RF faults.
After a start command from the CPU a delay of 5 seconds (multiplex board hardware) is applied to the
detection of faults relating to cooling air/water pressure and flow rate.