Siemens RVD240 - Limitations

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Siemens Building Technologies Basic documentation RVD240 CE1P2384en
HVAC Products 25 Function block Test and display 27.05.2004
If pulses are received at H5 (e.g. pulses for limiting the volumetric flow through heat
meters), the number of pulses received per minute will be displayed.
Only entire pulses can be displayed. The display shows pulses/min; the measurement
range is 0...2250 pulses/min.
The display shows H5 and the measured value.
If a radio clock receiver is connected to the data bus (LPB), the RVD240 can receive
the radio signals via data bus. On operating line 165, it is possible to see how much
time has elapsed (hh:mm) since the radio clock receiver received the last correct time
telegram.
The display shows r c l (Radio Clock) and hh:mm. If no valid value is available, the
display cannot be selected. The reason can be one of the following:
• No radio clock receiver connected
• Controller has no data bus address
• Connection interrupted
25.7 Limitations
Active limitations are displayed on operating line 169. Interrogation is made with the
setting buttons
and . Each limitation is assigned a code and the respective limita-
tion symbol.
Code Symbol Type of
limitation
Limited variable
1
Maximum Volumetric flow or output, common flow
2
Maximum Common primary return
3
Maximum Temperature differential (DRT), common flow
4
Maximum Common secondary flow
5
Maximum Volumetric flow or output, heating circuits**
6
Maximum Primary return heating circuit 1
7
Maximum Secondary return heating circuit 1
8
Maximum Temperature differential (DRT) heating circuit 1
9
Maximum Secondary flow heating circuit 1
10
Maximum Room temperature heating circuit 1
11
Maximum Flow temperature rise heating circuit 1
12
Maximum Primary return heating circuit 2
13
Maximum Secondary return heating circuit 2
14
Maximum Temperature differential (DRT) heating circuit 2
15
Maximum Secondary flow heating circuit 2
16
Maximum Room temperature heating circuit 2
17
Maximum Flow temperature rise heating circuit 2
18
Maximum Primary return d.h.w.
19
Maximum Secondary return d.h.w.
20
Minimum Common flow primary side*
21
Minimum Common secondary flow
22
Minimum Flow heating circuit 1*
23
Minimum Secondary flow heating circuit 1
24
Minimum Reduced room temperature setpoint heating circuit 1
25
Minimum Flow heating circuit 2*
26
Minimum Secondary flow heating circuit 2
27
Minimum Reduced room temperature setpoint heating circuit 2
* For suppressing hydraulic creep
** According to the setting made on operating line 56 (action of pulse input on the heating circuits)
Pulses
Radio clock receiver