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Figure 30: Momentary Feeder Fault Example
The logging function is part of the DSP-TDM display software which is constantly scanning the system module and
the feeder modules status to determine if a TRIP, feeder fault, system fault or NGR fault occurs that was not there
previously. If any of these conditions occur, then the following procedure takes place.
Event information is compiled along with the new record number, time and date in a register.
Register information is stored in non-volatile EEPROM memory. The module will capture the status of the events and
stamp both; the time and the date information to the event.
The system will not indicate the fault levels however. Also the fault must exist for at least 0.5 seconds to be recorded
completely particularly with regard to phase indication due to delays in the system module response.
Note: The DSP-TDM will not capture faults that occur while the DSP-TDM is initializing
When an event occurs, and is cleared, the screen will signal the presence of an event with a left arrow at the lower,
right hand end of the screen.
The following events are supported:
Error/Fault Device Event Message
No Comm. DSP-DCM Communication Error
ARC Flash Detection DSP-ADM ARC FAULT: INPUT
Bus Loss 3ph - Normal DSP-DSM BUS LOSS - 3 phases
Bus Loss 3ph - Generator DSP-DSM BUS LOSS - Generator Mode
Bus Loss 1 or 2 phases DSP-DSM Bus Loss - ph
Trip DSP-DFM TRIP: FDR # (FEEDER NAME)
Feeder Fault DSP-DFM Fault: FDR # (FEEDER NAME) - ph-%
Bus Fault DSP-DSM BUS FAULT - ph %
NGR Fault DSP-DRM NGR FAULT
Up to 1000 events can be stored before the EEPROM rolls over to start at 01 again.
Table 6: Fault Message List