Multiboiler Plants; Multiboiler Plants By Means Of Analog Input; Multiboiler Plants By Means Of Digital Interface - Siemens LMV50 Series Manual

Building Technologies

7.10 Multiboiler plants

Boiler sequence control is accomplished with the help of external devices or control
systems (e.g. BACS or PCs).
In principle, 2 choices are available:

7.10.1 Multiboiler plants by means of analog input

For that purpose, the load controller of the LMV5 has an analog input (X62).
This means that the individual boilers can be...
a) released / locked, and
b) operated at the required output (or set to the required setpoint).

7.10.2 Multiboiler plants by means of digital interface

For that purpose, BACS terminal X72 on the AZL5 can be used via the bus interface.
Inputs:
∂
Controller release / lock
∂
Predefined setpoint or predefined load
Outputs:
∂
Actual value
∂
Controller ON/OFF
∂
Manipulated variable multistage / modulating
∂
Error messages
For more detailed information, refer to chapter Cold start thermal shock protection.
Basic Documentation LMV5...
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CC1P7550en
22.05.2018