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Building Technologies Basic Documentation LMV27... CC1P7541en
11 Actuators X53 / X54 17.12.2018
11.3 Referencing
An incremental transducer is used for position feedback. This means that referencing of
the actuators must be performed after power-on. In addition, at the end of each
shutdown in phase 10, the actuators are referenced to ensure that individual stepping
errors, which could lead to shutdown, do not accumulate. If a position error occurs, the
LMV27 switches to the safety phase (Ph01), enabling the actuators with detected
position errors to be referenced. During the following phase 10, the only actuators
referenced are those that were not referenced before in the safety phase (phase 01).
The position of the reference point can be selected depending on the type of burner,
either the CLOSE position (<0°) or the OPEN position (>90°).
When using actuators SQM33.6 or SQM33.7, the actuator type (parameter 613) must
be set (refer to chapter Actuator type / running time).
Note!
If a SQM33.7 is used, the modulating operating ramp (parameter 544) may need to be
increased (refer to chapter Running speed / maximum curve slope).
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