111MN024-010
TPRN
TPRN Troubleshooting
In case a TPRN sub-rack shows any problems, a more detailed status and alarm description is
able to be provided through the remote supervision unit.
A complete overview of TPRN alarms is provided in Table 4.1.5.
A power supply degradation occurs in case the +12Vdc power falls below an in factory set
threshold level. In this case, the TPRN automatically switches to standby mode so that no over-
current is able to get through the circuitry of hosted modules, thus preserving the system’s
integrity. Once the power supply has been repaired, the TPRN needs to be rebooted. In case
the TPRN sub-rack is equipped with a redundant power supply (TPRN24), a degradation of
the +12 Vdc power results in an automatic switching from main to spare converter. In case a
redundant power supply is degraded, the TPRN automatically turns to stand-by mode. Once
the power supply has been repaired, the TPRN needs to be rebooted.
A I2Cbus alarm occurs when the TPRN sub-rack is not able to communicate with one or more
of the hosted modules. Each TPRN slot is able to automatically detect the presence of a
module inside the slot. If the module is detected but the TPRN is not able to communicate with
it through the I2Cbus, an alarm is activated.
Note: at commissioning, remember to mask the unused slots through LMT software (please
refer to the relevant manual for more information) to avoid triggering insignifi cant alarms.
Before carrrying out any troubleshooting procedures, please check the LMT or Supervision
System handbooks.
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