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Building Technologies Basic documentation LMV37.4... CC1P7546en
11 Actuators X53 / X54 17.12.2018
11.6 Changing the error detection band for
monitoring the actuator positions
The error detection band can be changed via parameter 606. A change is to be
made only when using SQN13.17 or SQN14.17 actuators which, due to their
mechanical design, require greater tolerances.
For these types of actuators, set parameter 606 to 2.2°.
No. Parameter
606
Tolerance limit of position monitoring (0.1°)
Index 0 = fuel
Index 1 = air
Greatest position error where an error is securely detected
Error detection band: (parameter 606 -0.6°) up to parameter 606
11.7 Forced travel
There are errors in the actuators’ feedback unit which can only be detected in
connection with position changes. To be able to also detect such errors when
maintaining the same position for longer periods of time, travel is enforced when – for
more than 50 minutes – an actuator moves no more than 2.8°. With forced travel, both
actuators are driven 2.8° in the direction of smaller positioning angles and back again to
the initial angular position. If a damper is less than 2.8° open, the actuator is driven in
the direction of positive angles in order not to run against mechanical stops, if present.
Forced travel lasts a total of 1 second.
11.8 Detection of line interruptions
The connecting line ensuring position feedback from the actuator to the LMV37.4 is
monitored for interruptions, which means that position feedback cannot fail without being
noticed.
Error
code
Diagnostic
code
Meaning for the LMV37.4
86 Bit 0
Valency 1
Line interruption fuel actuator
87 Bit 0
Valency 1
Line interruption air actuator
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