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MBT-4000B Multi-Band Transceiver System Revision 1
Appendix A MN/MBT4000B.IOM
A–2
A.2 Faults/Events
There are three types of Faults/Events that may occur and be recorded in the event log of the
MBT-4000B or BUC-4000:
• Summary Faults
• Configurable Summary Faults
• Informational Events
.
Each of these are described in further detail in the next
subsections; Tables B1 through B6 list possible
Fault/Event messages where applicable. An example of
a faulted system is shown in Figure A-2 ; here, Unit 2
has faulted.
Figure A-2. Faulted System Example
A.2.1 Summary Faults
Summary Faults indicate improper operation. When a Summary Fault condition occurs, the
Summary Fault Relay will be de-energized. If a Summary Fault occurs on a converter, it will
mute. If a Summary Fault occurs on the base unit, the converter will be muted according to the
specific error. If a Summary Fault occurs on the online unit of a redundant pair, the offline unit
will detect the fault and assume online state. In all cases, a corresponding event message will be
added to the event log.
Table A-1. MBT-4000B Summary Faults
Mnemonic Mute Description
15V PS1 All The 15 volt power supply is out of tolerance.
28V PS1 All The 28 volt power supply is out of tolerance.
5VT PS1 All The 5 volt power supply is out of tolerance.
7V5 PS1 All The 7.5 volt power supply is out of tolerance.
IIC BUS All Unable to communication via the internal high speed communication bus
Table A-2. BUC-4000 Summary Faults
Mnemonic Description
15V SUP The 15 volt power supply is out of tolerance.
5VT SUP The 5 volt power supply is out of tolerance.
7V5 SUP The 7.5 volt power supply is out of tolerance.
OVR TMP The maximum operating temperature has been exceeded.
PLL LD The PLL has lost lock.