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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 6 Temperature or pressure controller (internal load controller LC) 13.08.2004
6 Temperature or pressure controller (in-
ternal load controller LC)
6.1 General
The internal «load controller» is provided as an option to the LMV51... and is a stan-
dard component of the LMV52...
This is a digital PID controller for the control of temperature or pressure, featuring self-
setting or manual setting of the control parameters.
On fuel changeover, the control characteristics for modulating or multistage burners are
automatically adapted if required.
For operation and parameterization, refer to chapter «AZL5…»
6.2 Connection diagram
X63
Pt100
Output
LMV51
0-10 V
0-10 V
1
11
Input 3 Input 2
LR - connections
4-20 mA
0
FE
X62 X61 X60
Pt / Ni 1000
1
FE
OUTPUT
SET POINT ACT. VALUE TEMP.
7550a05E
FE
4-20 mA
0
Power: Sens.
4-20 mA
0
FE
Setpoint or
output
Actual value
pressure or temp.
Actual temp.
I1 = Pt 100
I4 = Pt / Ni 1000
Inputs 1 and 4
6.3 Operating modes with the load controller
For the connection of a load controller, the LMV5... can be operated in different
configurations. In that case, the internal load controller, different external load con-
trollers, or a load controller via a BACS can be used.
To ensure all involved bus users (BU, LC, AZL5…) are correctly configured, the global
parameter «LC_OptgMode» will be defined.
This parameter is set on the AZL5… when selecting the operating mode and is deliv-
ered to all bus users involved. Then, each bus user makes the configurations required
for the relevant operating modes.
Parameter: LC_OptgMode (ExtLC X5-03/Int LC/Int LC Bus/Int LC X62/Ext LC
X62/Ext LC Bus)
Note
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