User Manual

Operation RF-Orchestra!™ Transmitter Installation and Operation
5-38 6880493G02-C July 2000
If any of the PA Temperatures exceeds the Ambient Temperature by an amount greater than
the value configured by the user (Parameter 1025 – PA vs. Ambient Temp Shutdown Offset),
an error is logged, an alarm is logged, and the transmitter is disabled (shutdown).
Either the cutback or shutdown conditions can clear if the PA temperature drops (or the
Ambient Temperature rises).
High PA vs. Ambient Temperature Alarms/Error Logs
The following errors and alarms are associated with the High Ambient Temperature Cutback
and Shutdowns. See Appendix F for full details.
• A 104 Error Log Entries
E_HIGH_PA_HS_TEMPERATURE_FAIL_DECK_1
E_HIGH_PA_HS_TEMPERATURE_FAIL_DECK_2
E_PA_TEMP_SHUTDWN_ALARM
E_PA_TEMP_CUTBACK_ALARM
• A 99 Alarm Log Entries
Power Amplifier 1 Operating Temperature Has Exceeded Specification.
Power Amplifier 2 Operating Temperature Has Exceeded Specification.
Transmitter Disabled Due To High PA Temperature.
Transmitter Cutback Due To High PA Temperature.
Configuring High PA vs. Ambient Temperature Cutback/Shutdown Thresholds
By default, the RFO is programmed to perform a 3 dB cutback whenever one or more of the
installed PA’s heatsink temperature is more than 30 degrees C higher than the Ambient
Temperature (parameter 1026). For testing purposes, it may be necessary to change this value.
To modify the PA vs. Ambient Temperature 3 dB Cutback Offset, write a value to parameter
1025.
RFO FIPS: w 1025 <value>
Where <value> is a whole number between 0 and 70, in units of degrees celsius. The default is
30. Note that if this value is higher than the value stored in parameter 1024, the cutback will
never be performed prior to complete shutdown (see paragraph below).