Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Refrigeration demand 03.10.2011
26.3 Supervision
Main menu > Commissioning > Extra configuration > Aggregates > Refrigeration demand >
Operating line Adjustable values / remarks
Supervision ---, N.X1, N.X2, ... /
Activate function "Supervision"
The checkback signal for the refrigeration source can be connected to this input.
The checkback signal can be sent via a digital input (e.g. motor protection switch
"Refrigeration machine") or via an analog input (e.g. Ni 1000 sensor in the water
flow which signals refrigeration at temperatures <10 °C).
In the case of a digital input:
Normally closed = No refrigeration available
Operating position = Refrigeration available
In the case of the analog input, only inputs in °C can be configured. A limit value
can be entered. Above this limit value, refrigeration is considered unavailable.
If there is no refrigeration after a set time (fault status message delay), a fault
message is issued. In addition, setting value "Fault effect" allows for selecting if the
plant should be switched on.
Main menu > Commissioning > Settings > Refrigeration demand >
Operating line Range Factory setting
Limit value 0...50 °C 15 °C
Fault status message delay 00.00...59.55 m:s 30.00 m:s
Impact of fault No stop, Stop No stop
If the plant is to be switched off in case of fault, no more refrigeration demand is
signaled.
Supervision of refrigeration machine with thermal cutout.
DI
X...
Kältebedarf
Q
Y
d
S4 S4 S4
S5
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Digital
Cooling demand
x
Cooling demand
Supervision
Controller
3150s52en
The plant is shut down if cooling is requested and the refrigeration machine is
faulty.
Configuration
Setting values
Note
Application example