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Building Technologies
Boiler Sequence Controller RMK770
CE1P3132en
HVAC Products
11 Function block miscellaneous
01.03.2005
Main menu > Commissioning > Settings > Inputs
Operating line
Range
Factory setting
RMK770… (or RMZ78…)
Ni1000 / 2×Ni1000 /
T1 / Pt1000 / 0…10 V
Ni1000
The outside temperature can be transmitted to other controllers via bus or it can be
received by the bus. For that purpose, communication must be activated and an outside
temperature zone must be set. An outside temperature zone identified by “---” means
that the outside temperature on the bus is inactive.
To enable different outside temperatures to be transmitted via bus (e.g. outside tem-
perature for heating zone North, outside temperature for heating zone South), they
must be assigned to own outside temperature zones. The relevant settings are de-
scribed in chapter 13 “Communication”.
Main menu > Commissioning > Communication > Distribution zones
Operating line
Range
Factory setting
Outside temperature zone
---- / 1…31
----
11.3.1 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 con-
trollers via bus; the temperature transmitted is still the measured value of the connected
outside sensor.
11.3.2 Error
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, error message “Outside temp sensor error“ will appear. Internally, the
controller continues to operate using 0 °C as a backup value.
Error 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, error message ">1 outside temperature
sensor" will be delivered.
Outside temperature
via the bus
Configuration
Caution
Note
