External Load Controller Via Analog Input X64 Pin 1 / X64 Pin 2; Switching Thresholds For Modulating Operation - Siemens LMV37.4 Series Basic Documentation

Switching thresholds /
minimum positioning
step
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9.6 External load controller via analog input X64
pin 1 / X64 pin 2
For the preselection of external outputs, an analog 4...20 mA input is provided.
Burner startup can take place only when contact X5-03 pin 1 is closed (load controller
(LR) On / Off).
A disruption of the current input or a current signal <3 mA leads to deactivation of the
analog input's external predefined output. To avoid unnecessary positioning steps of the
actuators when the input signal varies, it is possible to set a minimum positioning step
for the predefined output. The minimum positioning step only becomes active in
modulating operation. For the external load controller via the analog input, a value of 1%
is preset.
No. Parameter
123.1 Minimum output positioning step: Output external load controller analog
LMV...
GND
Figure 64: External load controller via analog input X64 pin 1 / X64 pin 2

9.6.1 Switching thresholds for modulating operation

Actual value
Low-fire
Low-fire
High-fire
Basic documentation LMV37.4...
9 Connection to load controllers
PWM fan
5
4
3
2
1
Bild 364e/0409
Current
3...4 mA
4 mA
20 mA
Display / output value
20%
20%
100%
97/235
CC1P7546en
20.09.2013