Siemens LMV37.4 Series Basic Documentation page 119

Building Technologies
Example of actuator with counterclockwise rotation:
When referencing in the Close position, the actuator first travels a certain distance into
the working range (toward the Open position). Then, it travels to a position representing
maximum -7.7°, thereby crossing the reference mark for the first time. Then, the
actuator moves in the other direction again and detects the inner ramp of the reference
mark. This is the reference point used by all positions. If the reference point is
parameterized in the Open position, referencing takes place in a mirror-symmetrical
manner. In that case, the actuator first travels into the working range (toward the Open
position). Then, it crosses the reference mark and travels to a position representing
maximum 110.6°, then back to the inner ramp of the reference mark.
Figure 79: Angle definitions with SQM33
Error Diagnostic
code code
85 0
1
Bit 7
Valency
≥128
Basic documentation LMV37.4...
11 Actuators X53 / X54
Close (0°
Range stop "Open"
Reference range "Open"
Meaning for the LMV37.4
Referencing error of fuel actuator
Referencing error of air actuator
Referencing error due to parameter change
Reference range "Close"
7.7°
0.6°)
Range stop "Close"
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