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Siemens RVP351 Manual

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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 13 Function block: District heat 15.03.2011
The current limit value can be determined as follows:
If the outside temperature is higher than or equal to the value set for the start
of compensation (setting on operating line 113), the current limit value is the
constant value entered on operating line 101
If the outside temperature lies below the value set for the start of compensation,
the current limit value T
L
is calculated according to the following formula:
T
L
[°C] = T
L constant
+ [ ( T
L start
T
A
)
*
s ]
The outside temperature is the compensating variable used for maximum limitation
of the primary return temperature; it can be acquired from the local sensor or via
LPB.
Limitation operates according to the selected characteristic:
When the outside temperature falls, the return temperature is initially limited to
the constant value
If the outside temperature continues to fall, it reaches the set starting point for
shifting compensation. From this point, the limit value is raised as the outside
temperature falls; the slope of this section of the characteristic can be adjusted
Maximum limitation of the return temperature takes priority over minimum limitation
of the flow temperature.
This function can be deactivated via operating line 101.
If the return temperature is limited, the display shows
.
With maximum limitation of the return temperature, the integral action time deter-
mines the rate at which the flow temperature setpoint is reduced.
Short integral action times lead to faster reductions
Long integral action times lead to slower reductions
With this setting, the impact of the limiting function can be matched to the type
of plant.
Function
Integral action time
… 55 …


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