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Building Technologies Basic Documentation LMV27... CC1P7541en
11 Actuators X53 / X54 17.12.2018
11.3.1 Reference travel
Reference travel means that different reference travels are performed, aimed at
unambiguously determining the actuators’ permissible working range. This prevents the
actuators from traveling to a range outside the optical feedback system or against a
mechanical stop should a power failure during referencing occur. Parameter 611 must
be set depending on the mechanical construction and the type of actuator used.
In the case of reference travel type 1 the SQM33 actuator first travels to the starting
point.
Note!
Always select reference travel type 2 for SQN13 and SQN14.
No. Parameter Setting for actuator
SQM33 SQN13 SQN14
611 Type of referencing
Index 0 = Fuel 0 2 2
Index 1 = Air 0 2 2
No. Parameter Setting for actuator type
SQM33
611 Type of referencing
Index 0 = fuel 1
Index 1 = air 1
To prevent the actuator from running against a mechanical stop during referencing, the
home position may have to be adjusted (depending on the direction of rotation and a
reference point of about 3° or 87°). In the case of stops within the usable range, the
prepurge or postpurge position must be checked also.
Refer to the figure below for details of the reference travel.
Parameterization for
reference travel type 0 and
type 2
Parameterization for
reference travel type 1
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