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

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6.3.2 (Burner flange) X3–03, terminals 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 8: Burner flange X3-03
For error diagnostics and parameters, refer to subsection Safety loop.
6.3.3 Input for external controller (ON / OFF) X5–03, terminal 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
controller).
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 parameterization (refer to section End of running position).
Note
Burner startup can take place only when this contact is closed.
External load controller OPEN / stage 2
External load controller (On / Off)
Figure 9: Inputs for external load controller ON / OFF X5-03
6.3.4 Inputs X5-03 terminal 2 and terminal 3 (Opening / Closing
or stage 2 / stage 3)
Inputs for connection of an external controller with contact outputs (refer to subsection
External load controller via contacts X5-03, terminals 2 and 3).
External load controller OPEN / stage 2
External load controller (On / Off)
Figure 10: Inputs external load controller Opening / Closing X5-03
Basic documentation LMV37.4...
6 Basic unit
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L for controller
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Flange
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1
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On / Off
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On / Off
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