Communication; Functional Check / Wiring Test - Siemens RMB795B Basic Documentation

Explanations relating to
the setting values
Diagram relating to the
setting values (example)
Key
Purpose
Setting values
Purpose
104 / 144
Siemens
Building Technologies
"Setpoint at 0 V" determines the flow temperature setpoint at DC 0 V.
"Setpoint at 10 V" determines the flow temperature setpoint at DC 10 V.
"Limit value" denotes "Limit value for refrigeration demand": Temperatures above
this level are interpreted as no refrigeration demand.
As long as the flow temperature setpoint does not exceed the set limit value,
DC 0 V output signal is issued. If the temperature drops below the limit value, the
corresponding output signal is issued until the setpoint again exceeds the limit
value plus hysteresis of 0.5 K.
Output signal Y (DC 0...10 V) for refrigeration demand must correspond to a flow
temperature setpoint range of 6...13 °C. This limit value should be at 12 °C. The
diagram shows the parameters to be set and the progression of the refrigeration
demand signals:
Y [ V ]
2
10
0
6 7 8 9 10 11
1
Setpoint in °C at DC 0 V.
2
Setpoint in °C at DC 10 V.
3
Limit value for refrigeration demand

11.5.4 Communication

Refrigeration demand can be transmitted over the bus to other devices of a
refrigeration distribution zone if communication is activated (see Sec. 13). A "Refrig
zone source" must be defined.
Main menu > Commissioning > Communication > Distribution zones >
Operating line
Refrigeration
distribution zone,
generation side

11.5.5 Functional check / wiring test

For making a functional check during the wiring test, the outputs of the
"Refrigeration demand" function block can be switched directly.
Central control unit RMB795B
Distribution zones
3
1
TV
[°C]
12 13 14
here 13 °C
here 6 °C (factory setting)
here 12 °C (factory setting)
Range
----, 1...31
Factory setting
----
CE1P3122en
18.01.2012