Commissioning; Before You Start; Safety Notes; Potential Impact Of Power Failures - Siemens RMB795B Basic Documentation

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Plant example
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Siemens
Building Technologies
5

Commissioning

5.1

Before you start

5.1.1

Safety notes

Preparation for use and commissioning of Synco™ 700 products must be
undertaken by qualified staff trained by Siemens Building Technologies.
• When the central control unit is in commissioning mode, control will remain off,
that is, all outputs are set to a defined OFF state.
• In that case, all internal safety functions of the central control unit will also be
deactivated. Communication also stays inactive.
5.1.2

Potential impact of power failures

As mentioned above, certain activities of the central control unit will be interrupted
during commissioning. In the case of distributed plant, this can have the effect of a
partial power failure.
The possible effects are investigated and explained using a plant example with the
following devices:
Room unit Function
RMB795B Preselection of operating modes for the different room groups
RXB/RXL, Room controllers and room thermostats, assigned to different
RDG/RDF/RDU room groups.
RMU7.. Collection of the refrigeration / heat request signals of
(or RMH760) preparation
A power failure or wrong configuration of communication has exactly the same
effect as if the respective device was in commissioning mode.
The following table shows the results in detail:
Case RMB795B
1 Power failure /
commissioning
mode
2 Normal operation
3 Normal operation
Central control unit RMB795B
Commissioning
RXB/RXL, RMU7...
RDG/RDF/RDU
Operating mode According to the
request signals
Comfort.
Power failure / No demand
→ OFF
commissioning
mode
By operating mode Power failure /
RMB795B commissioning
mode
Potential effect
Preparation may
also be in progress
during the night
No room control and
no preparation
No preparation
CE1P3122en
18.01.2012