Teledyne HPAC-2005, Operation Manual

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62 205356 REV T 3 RU SSPA Chassis Operations Manual
3.Gain Control
and press the
Enter
key. Select either Auto Gain On or Auto Gain Off.
When this option is activated, the SSPA will automatically reserve 5 dB of attenuator
range for future gain compensation. This will reduce the maximum SSPA gain by 5 dB.
The attenuator range will also be reduced to 15 dB.
Five dB of reserved attenuator range allows the system to fully auto compensate gain
when one SSPA module in a single 5RU SSPA unit enters a fault condition.
2.4.6 N+1 RF Power Measurements
The N+1 system may be equipped with a dedicated RF power measurement unit. The
RF Power Detector provides RMS measurement of Forward and Reflected RF power
directly at the output waveguide and this reading is acquired by the N+1 Master unit.
Besides N+1 system level power detection, each individual SSPA unit may be
equipped with its own RF power detector. This reading can be viewed at each SSPA
unit and may be used for troubleshooting individual SSPA units.
To view the RF power detector reading on the front panel, press the
Main Menu
key,
select
1.SysInfo
and press the
Enter
key; press the
Down Arrow
[ ▼ ] key to get to
Sys Info Page 1.
2.4.7 N+1 Fault Detection
The N+1 system carries comprehensive fault detection logic. Each SSPA chassis pro-
cesses its internal fault conditions as if it was a standalone unit. All N+1 Slave units re-
port any fault state to the Master Module, which is responsible for system wide fault
state handling. Failure of any single SSPA unit leads to a minor N+1 alarm on the Mas-
ter Module. This type of fault condition will not produce a summary system alarm.
The user may view the number of faults in a system from the front panel by pressing
the
Main Menu
key of the Master Module; press the
Up Arrow
[ ▲ ] key to get to N+1
Master Info Page 2. Any detected SSPA unit alarms present in the system will be dis-
played at the “N+1 Alarms” screen.
If the Master unit detects two or more failed units, it will report a system-wide Summary
alarm (Summary alarm LED on the Master unit will illuminate). The cause of the alarm
will not be evaluated by the Master Module. To find cause of the failure, the operator
will need to evaluate the local fault conditions of the failed SSPA unit.