(Burner Flange) X3-03, Pin 1 And 2; Input For External Controller (On / Off) X5-03, Pin 1; Inputs X5-03 Pin 2 And 3 (Open / Close Or Stage 2 / Stage 3) - Siemens LMV37.4 Series Basic Documentation

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7.3.2 (Burner flange) X3–03, pin 1 and 2
End switch burner flange (component of safety loop).
"L" for end switch burner flange
End switch burner flange
(component of safety loop)
Figure 10: Burner flange X3-03
For error diagnostics and parameters, refer to chapter Safety loop.
7.3.3 Input for external controller (ON / OFF) X5–03, pin 1
When the external control loop is closed, the internal input message «Heat request» is
generated.
A heat request exists when the external controller signal is pending and, depending on
the configuration, a load controller calls for heat (refer to chapter Connection of load
controllers).
When there are no more requests for heat, the burner shuts down. The fuel valves are
closed, either immediately when the timer has elapsed, or when the low-fire position is
reached, depending on the parameter settings (refer to chapter End of operating
position).
Note
Burner startup takes place only when this contact is closed.
"L" for controller
External load controller OPEN / stage 2
External load controller (On / Off)
Figure 11: Inputs for external load controller ON / OFF X5-03

7.3.4 Inputs X5-03 pin 2 and 3 (Open / Close or stage 2 / stage 3)

Inputs for connection of an external controller with contact outputs (refer to chapter
External load controller via contacts X5-03, pin 2 and 3).
"L" for controller
External load controller OPEN / stage 2
External load controller (On / Off)
Figure 12: Inputs external load controller Open / Close X5-03
Note!
When the Switching back to pilot function (parameter 191) is used, the load controller
contacts are not available (refer to chapter Switching back to pilot).
Basic documentation LMV37.4...
7 Basic unit
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Flange
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On / Off
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20.09.2013