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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 12 Function block: Setpoint return temperature limitation 15.03.2011
12.3.3 Mode of operation with an autonomous unit (without
bus)
Controller 2 generates internally a
critical locking signal which shuts the
heating circuit mixing valve and
deactivates the charging pump
Without minimum limita-
tion of the return tem-
perature
Operating line 101 = 50 °C
Return temperature sensor
connected
12.3.4 Mode of operation in interconnected plants
Controller 1
Plant type no. 3-0
Controller 2
Plant type no. 1-0
Controller 3
Plant type no. 1-1
Critical locking signal
Controller 2 shuts the
heating circuit mixing
valve
Controller 3 shuts the heating
circuit mixing valve and deacti-
vates the d.h.w. charging pump
LPB
2474B04e
Setting operating
line101 = 50 °C,
return temperature
detector connected.
Controller 1 shuts the
heating circuit mixing
valve
Setting operating line 101 = - - - , no own
return temperature detector connected
Setting operating line 101 = - - - , no own
return temperature detector connected
Critical locking signal
Controller 1
Boiler controller
Controller 2
Plant type no. 1-0
Controller 3
Plant type no. 1-0
Return temperature signal
Controller 2 limits the
return temperature
to 50 °C min.
LPB
2524B08e
Setting operating line 101 = 50 °C,
return temperature detector connected
Setting operating line 101 = 40 °C, on own
return temperature detector connected
(With no possibility of
minimum limitation of
return temperature)
Controller 3 limits the
return temperature
to 40 °C min.
The zone controller with its own return temperature sensor (plant type 1 - x) passes
the return temperature to the other zone controllers in the same segment.
These can thus ensure minimum limitation of the return temperature locally, depend-
ing on the settings made, which means that they generate a critical locking signal
internally. For response to critical locking signals, refer to chapter 17.4.6 "Locking
sign
al gain").
Variant 1
Central impact
of limitation
Variant 2
Local impact
of limitation
53


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