351804-1 Rev. 100
COM5000-8 TECHNICAL MANUAL
24
When the FAN fault condition disappears, the AIR FLOW fault LED will turn OFF on the next key. It takes
approximately 10 seconds of transmission for this fault to be cleared. (Note: Momentary flashing of a fault
LED does not indicate a fault. The LED must be on continuously to indicate a fault.)
When the Temperature fault condition disappears, the TEMP fault LED will turn OFF.
Combiner faults are also indicated on the T-4180 Module Status screen #1.
System Controller Module:
The System Controller module monitors forward (FWD) and reflected (REV) power from the VSWR detector
inside the Combiner module and calculates VSWR. A VSWR fault is declared when the VSWR exceeds
approximately 4:1.
With a VSWR fault the System Controller and PA module LED display is as shown below.
System
Controller
Module Fault
1.25kW PA
Module LED’s
System Controller FAULT LED’s
PWR
FAULT
TEMP
VSWR
SPLY
AIR
FLOW
VSWR
OFF
OFF
OFF
ON
OFF
OFF
The transmitter will continue to operate with reduced output power.
If a new operating frequency is selected following a VSWR fault, the power will remain low and only slowly
increase to a normal value if the VSWR condition has improved.
Transmitter rack cabinet system
a.
The Operational Interlock connection (Cabinet Interlock) is monitored by the System Controller.
With an operational interlock switch “open” a Cabinet Interlock fault is declared. The Transmitter will
remain in
– or return to – STDBY mode (see OPER mode description above). In this condition, the
50VDC output of the Power Supply Module will be off.
b.
The System Controller monitors the serial data communication with each of the four PA modules. A
failure to communicate with a PA module generates a Communications fault. The Transmitter
response is to disable the PA module bias and reduce system power output as needed.
Note:
The System Controller LED display will not show Operational Interlock fault or PA module serial
communications faults. The specific fault condition is indicated on the T-4180 Module Status
screens.
Содержание COM5000-8
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