Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Operating modes 03.10.2011
 Button (restaurant: 2nd speed ventilation) wired to predefined timer function
input "N.X...":
If the button is pressed for more than 3 s, operating mode Comfort takes effect
for the set time (timer function)
 Window switch connected to predefined room operating mode input 1 "N.X...",
preselected room operating mode = Economy:
As long as the window remains open, Economy mode is active
6.5.4 Troubleshooting
Digital signals cannot be monitored. If the inputs are missing, they are interpreted
as described above.
We recommend to keep normally open potential-free contacts for the digital inputs
enabling the controller to operate in automatic mode in the event of wiring breaks.
6.6 Plant operating mode selection via request
input (basic type P, C)
If the controller is configured as a demand-controlled air handling unit (basic
type P) or as demand-dependent chilled water controller (basic type C), it can be
switched on via a universal input. This way, the system can also be created using
non-communicative controllers. To activate this function, configure the relevant
digital input. This function can only be configured for basic type P or C.
Main menu > Commissioning > Extra configuration > Operating mode >
Operating line Adjustable values / remarks
Request input ---, N.X1, N.X2, ...
The request input can handle digital and analog signals. Setting values "Limit value
on" and "Limit value off" are used to convert an analog signal to a request signal
"On / Off".
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Operating mode >
Operating line Range Factory setting
Limit value on Depending on the selected
type
Depending on the type
Limit value off Depending on the selected
type
Depending on the type
6.6.1 Mode of operation: Basic type P
If a signal is present at the terminal of the input, it is interpreted as an air handling
unit request, and control becomes active. Setpoint generation is described in
section 12.
Ensu
re that the air dampers for the VAV actuators are opened prior to switching on
the fans.
Application examples
Errors in operation
Recommendation
Configuration
Setting values
Note