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Building Technologies Basic documentation LMV37.4... CC1P7546en
9 Connection to load controllers 17.12.2018
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
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.
The behavior of the LMV37.4 in the event of an invalid analog input can be defined.
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
204
Behavior if analog input is invalid (4…20 mA)
0 = deactivate default output low-fire / trim function (with warning message)
1 = safety shutdown + startup prevention
2 = deactivate default output low-fire / trim function (without warning message)
X64
GND
PWM fan
LMV...
Bild 364e/0409
5
4
3
2
1
Figure 73: External load controller via analog input X64 pin 1 / X64 pin 2
9.6.1 Switching thresholds for modulating operation
Actual value Current Display / output value
Low-fire 3...4 mA 20%
Low-fire 4 mA 20%
High-fire 20 mA 100%
Switching thresholds /
minimum positioning
step
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