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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 14 Function block: D.h.w. 15.03.2011
Absolute priority
Shifting priority
No priority (parallel operation)
Priority is accomplished by delivering locking signals. The impact of the locking
signals is described in chapter 17.4.6 "Locking signal gain".
14.6.3 Absolute priority
During d.h.w. charging, the heating circuits are locked, which means that they
cannot draw any heat.
Controller without bus connection:
During d.h.w. charging, the controller sends an uncritical locking signal of 100%
to its own heating circuit
Controller with bus connection (not possible with RVP351):
During d.h.w. charging, the controller informs the consumer master that it pres-
ently effects d.h.w. charging with absolute priority. The consumer master is the
device having the same segment number as the controller with device number 1.
The consumer master then sends an uncritical locking signal of 100% to all con-
trollers in the same segment. If the consumer master is located in segment 0,
the uncritical locking signal is sent to all controllers in all segments
14.6.4 Shifting priority
During d.h.w. charging, the heating circuits are throttled if the heat source (the
boiler) is not able to maintain the required setpoint. In that case, the boiler
controllers display shows
.
Controller without bus connection:
If, during d.h.w. charging with shifting priority, the boiler is not able to maintain
its setpoint, the differential of setpoint and actual value is integrated and an
integral-dependent uncritical locking signal in the range of 0…100% is sent to
the controller’s own heating circuit.
Since shifting priority is determined by the boiler, this kind of priority is only pos-
sible with plant type 3 - x. With plant types 1 - x and 2 - x, setting "Shifting prior-
ity" has the same impact as setting "No priority"
Controller with bus connection (not possible with RVP351):
During d.h.w. charging, the controller informs the heat source in the same seg-
ment that it currently effects d.h.w. charging with shifting priority. If, now, the
boiler is not able to maintain its setpoint, the differential of setpoint and actual
value is integrated and an integral-dependent uncritical locking signal in the
range of 0…100% is generated. If the heat source is located in segment 0, it
sends the signal to all controllers in all segments. If the heat source is located in
segment 1…14, it only sends the signal to the controllers in the same segment
14.6.5 No priority
No priority means parallel operation. D.h.w. charging has no impact on the heating
circuits.
59


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