Changing The Error Detection Band For Monitoring The Actuator Positions; Forced Travel; Detection Of Line Interruptions - Siemens LMV37.4 Series Basic Documentation

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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
Tolerance limit of position monitoring (0.1°)
Index 0 = fuel
606 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 basic unit is
monitored for interruptions, which means that position feedback cannot fail without being
noticed.
Error Diagnostic
code code
86 Bit 0
Valency 1
87 Bit 0
Valency 1
Basic documentation LMV37.4...
11 Actuators X53 / X54
Meaning for the LMV37.4... system
Line interruption fuel actuator
Line interruption air actuator
CC1P7546en
20.09.2013