User's Manual

Diagnostics
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 33 of 134
5. Diagnostics
5.1 Status Monitoring
The paging transmitter has a number of sensors which are continuously monitored. The sensors are used to
monitor:
 Internal voltage and current levels.
 Ambient and transmitter temperature.
 Fan operation.
 Transmitted and reflected power.
Each sensor has configurable upper and lower cut-offs that will cause a fault when exceeded. For example, if
the driver temperature upper cut-off is exceeded, the high driver temperature fault will be set active.
A full list of sensors, units of measure, and range of values can be found in Appendix E.
5.1.1 Conditional Cut-off Checking
Some sensors are only compared against their upper and lower cut-offs under certain conditions, such as when
the transmitter is on. The following sensors have conditional cut-off checking:
During transmission:
 Exciter current.
 PA current.
 Driver current.
 Reverse power.
 Transmit power.
 Driver power.
 Exciter power.
 Isolator VSWR.
While the fans are turned on to full speed:
 Front and rear fan current.
 Front and rear fan RPM.
A sensor that falls outside its cut-offs while its checking condition is met will cause the respective fault to
become active. A non-latching fault will only be cleared once it has returned to within its cut-offs while its
checking condition is met. A latching fault must be cleared in software.
Sensors -> Sensor Configuration