Troubleshooting; Meters - Siemens RMB795B Basic Documentation

Trend signal not
available
Power failure or restart
Purpose
Note
Siemens
Building Technologies

15.1.4 Troubleshooting

If a trend signal at the local inputs is no longer available (e.g. due to a faulty
sensor), trends are no longer recorded.
In that case, the fault status messages must be checked under:
Main menu > Faults > Faults current >
If the values are not available via bus, trends are no longer recorded.
And there will be no fault status message
After a power failure or when leaving the "Extra configuration" menu (fresh start
of the central control unit RMB795B), the values of the 8-hour and 8-minute view
will be deleted.
However, the values of the 24-hour view and those of the last 6 days are retained.
15.2

Meters

Meters are used to acquire consumption values.
4 independent meters are available.
Pulses from gas, hot water, cold water and electricity meters are processed. The
pulse values represent:
• Energy in kJ, MJ, GJ, Wh, kWh and MWh.
3
• Volume in m
, l or ml.
• Variables without unit (0...3 decimal places).
• Heat cost unit.
• BTU.
The pulses are converted to consumption values according to the setting values,
added, and the cumulated values are stored as 15-month values at midnight when
the month changes. The meters are used to optimize plant operation.
Due to their inaccuracy, pulse counters in the RMB795B are not suited for billing
purposes. Only direct meter readings (heat meters, electricity meters, etc.) deliver
the valid values. Meters using Namur or S0 circuitry are not supported.
Central control unit RMB795B
Data acquisition
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CE1P3122en
18.01.2012