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Building Technologies Basic documentation LMV37.4... CC1P7546en
9 Connection to load controllers 17.12.2018
9 Connection to load controllers
The LMV37.4 can be connected to different load controllers. Heat request and the
required burner output are determined in accordance with the priorities of the different
load sources.
9.1 Load controller ON contact X5-03 pin 1
This contact is given priority over all load controller sources. A heat request can only be
made when this contact is closed. The contact is safety-related and can also be used in
connection with load controllers featuring an integrated temperature limiter function.
9.2 External load controller via contacts X5-03, pin
2 / pin 3
The heat request is delivered via pin 1. Modulation of burner output is effected via pin 2
and 3. Here, a differentiation is made between modulating and multistage operation
(refer to chapter Selection of operating mode).
Modulating operation X5-03 (OPEN pin 3 / CLOSE pin 2)
If input Open is active, the burner’s output is increased. If input Close is active, the
burner’s output is decreased. If none of the inputs is active, the burner’s output is not
changed. The rate of integration is 32 seconds for changing the output from low-fire to
high-fire (parameter 544), that is from 20 % to 100 %, or vice versa.
Output integration always takes place in the operating position.
200 ms is the shortest positioning step that is securely detected.
LMV...
Bild 316e/1010
X5-03
Load controller (LR) (ON / OFF)
L
Controller
Controller ON
L
Figure 69: Modulating operation X5-03
Note!
When the Switching back to pilot function is used, the load controller inputs OPEN
CLOSE (X5-03 pin 2 and 3) are not available (refer to chapter Switching back to pilot).
Analog input X64 is used as the load controller source in this case.
No. Parameter
544 Ramp modulating
Minimum positioning step
To prevent the actuators from making unnecessary position changes when the
preselected target output varies, a minimum positioning step can be set. In that case,
the LMV37.4 changes the output only when the preselected target output exceeds the
minimum positioning step. This minimum positioning step is only used in modulating
operation.
No. Parameter
123.2 Minimum output positioning step: Output of external load controller contacts
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