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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 4 Acquisition of measured values 15.03.2011
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 minimum and maximum limitation of the return
temperature.
In interconnected plants (RVP340 or RVP350), the return temperature with plant
type 1 - x can be acquired via data bus. Controllers with plant type 1 - x and con-
nected 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 1- 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.
4.6.2 Error handling
The controller's response to errors in the measuring circuit depends on the setting
made on operating line 126 (d.h.w. storage tank sensor/thermostat).
In the event of a short-circuit or an interruption of one of the 2 measuring circuits,
the controller continues to operate with the other measuring circuit, if possible. An
error message is not delivered.
If both measuring circuits do not produce a valid measured value, an error mes-
sage is delivered. D.h.w. is no longer heated; the charging pump will be deacti-
vated.
1 storage tank sensor
(operating line 126 = 0)
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