71/213
Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 8 Connection to load controllers 01.12.2009
8 Connection to load controllers
The LMV37.4... system can be connected to different load controllers. The heat request
and the required burner output are determined in accordance with the priorities of the
different heat sources.
8.1 Controller on contact X5-03, terminal 1
This contact is given priority over all output sources. A heat request can be made only
when this contact is closed. The contact is safety-related and can also be used in con-
nection with controllers featuring an integrated temperature limiter function.
8.2 External load controller via contacts X5-03,
terminal 2 / terminal 3
The heat request is delivered via terminal 1. Modulation of burner output is effected via
terminals 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 «▲» terminal 3 / CLOSE «▼» terminal 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 stays the
same.
The rate of integration is 32 seconds for changing the output from low-fire to high-fire,
that is from 20 to 100%, or vice versa. Output integration always takes place in the op-
eration position.
200 ms is the shortest positioning step that is securely detected.
LMV...
Bild 316e /1109
X5-03
Load controller (LR) (ON / OFF)
L
Controller
Controller ON
L
Figure 33: Modulating operation X5-03
Minimum positioning step
To prevent the actuators from making unnecessary position changes when the prese-
lected target output varies, a minimum positioning step can be set. In that case, the ba-
sic unit changes the output only when the preselected target output exceeds the mini-
mum positioning step. This minimum positioning step is only used in modulating opera-
tion.
No. Parameter
123.2 Minimum output positioning step: Output of external load controller contacts
To Next Page
Loading...
Need help?
General
