125MN024-010
TPRF
In case a TPRF31 sub-rack shows any problems, more detailed status and alarm descriptions
are able to be provided through the remote supervision unit.
A complete overview of the TPRF31 alarms is reported in the previous Table 4.2.14.
Please note that:
• The power supply degradation (Vcc) occurs in case the +12Vdc power falls below the
critical threshold level. In this case, the TPR31 automatically turns to standby mode so that
no over-current is able to get through the circuitry of hosted modules, thus switching off
the active modules and preserving the system’s integrity. As soon as the power supply
voltage is restored to its standard level, the TPRF31 automatically turns on the active
cards again. Should this not happen, press the Reset button (fi g. 4.2.4).
• A I2Cbus alarm occurs when the TPRF31 sub-rack cannot communicate with one or
more hosted modules. Each TPRF31 slot is able to automatically detect the presence
of a module inside the slot. If a module is detected, but the TPRF31 is not able to
communicate with it, the I2Cbus alarm is activated.
Note: during the system commissioning, remember to mask the unused slots by pressing the
Store/Clear button (fi g. 4.2.6) or through the LMT software (please refer to the relevant manual
for more information) to avoid triggering insignifi cant alarms.
Before carrying out any troubleshooting procedures, please check the LMT or Supervision
System handbooks.
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