Error Handling; Return Temperature (B7); Types Of Sensors; Storage Tank Temperature (B31, B32) - Siemens RVP360 Basic Documentation

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4.4.2

Error handling

In the event of a short-circuit or an interruption of the measuring circuit, the control-
ler responds as follows, depending on the outside temperature source:
Controller not connected to data bus (LPB):
The control operates with a fixed outside temperature of 0 °C. An error message
is delivered
Controller connected to data bus (LPB):
If the outside temperature is available via data bus, it is used. An error message
is not delivered (this is the normal status in interconnected plants!). But if no out-
side temperature is available via data bus, the control uses a fixed outside tem-
perature of 0 °C. In that case, an error message is delivered
4.5

Return temperature (B7)

4.5.1

Types of sensors

Suitable are Siemens sensors operating with a sensing element LG-Ni1000.
This measured value is required for the minimum limitation of the return tempera-
ture.
In interconnected plants, the return temperature with plant type 4 - x can be ac-
quired via data bus. Controllers with plant type 4 - x and connected sensor forward
the return temperature via data bus.
4.5.2 Error handling
If, in the event of a short-circuit or an interruption of the measuring circuit, the con-
troller requires the return temperature, it responds as follows:
If a return temperature from a controller in the same segment is available via
data bus, it is used (only with plant type 4 - x). No error message is delivered
since this is the normal status in interconnected plants
If a return temperature signal is not available via data bus, the return tempera-
ture limitation functions are deactivated and an error message is delivered
4.6

Storage tank temperature (B31, B32)

4.6.1 Types of sensors
The storage tank temperature can be acquired as follows:
With 1 or 2 sensors operating with a sensing element LG-Ni1000, or
With 1 or 2 thermostats.
Solar d.h.w. heating must always be effected with 1 or 2 sensors.
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2017-07-24