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Building Technologies
Boiler Sequence Controller RMK770
CE1P3132en
HVAC Products
12 Function block “Miscellaneous“
23.04.2009
12.3.1 Outside temperature simulation
To test the response of the plant, an outside temperature can be simulated and the
measured value of the outside temperature (outside sensor or bus) can be overridden.
Main menu > Miscellaneous > Inputs
Operating line
Range
Factory setting
Outside temperature simulation
---- / –50.0…+50.0 °C
----
During the simulation, it is also the simulated outside temperature that is used for the
composite and the attenuated outside temperature.
The simulation is
not
automatically terminated (no time-out supervision!).
The inputs should only be overridden by qualified staff and within a limited period of
time only!
During the simulation, fault status message “Outside sensor simulation active” appears.
This message is present until the outside temperature simulation is set back to “----“.
This is to make certain that the plant cannot be quit without terminating the simulation.
The simulated outside temperature is only used locally. It is
not
delivered to other
controllers via bus; the temperature transmitted is still the measured value of the con-
nected outside sensor.
12.3.2 Fault
handling
When leaving the
Commissioning
menu, a check is made to see if the outside sensor is
connected or if the bus receives a sensor value. In the case of an open-circuit or short-
circuit, fault status message “Outside temp sensor error“ appears. Internally, the con-
troller continues to operate using 0 °C as a backup value.
Fault status message “Outside temp sensor error“ also appears when there is no signal
via bus. If other outside temperatures are available via bus, the one used is the outside
temperature first transmitted.
Only 1 outside temperature can be present in the same zone. If several controllers send
their outside temperature to the same zone, fault status message “>1 outside tempera-
ture sensor” is delivered.
Number Text
Effect
10 Outside
temp
sensor error
Nonurgent message; must not be acknowledged
11
>1 outside tem-
perature sensor
Urgent message; must be acknowledged
12 Outs
sensor
simulation active
Nonurgent message; must not be acknowledged
Caution
Note
Fault status messages