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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 10 Actuators X53 / X54 01.12.2009
10.6 Changing the error detection band for
monitoring the positions
The error detection band can be changed via parameter 606.
A change is to be made only when using SQN13.17… / 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: (P606 -0.6°) up to P606
10.7 Forced travel
There are errors in the actuators’ feedback unit that 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 an-
gles in order not to run against mechanical stops, if present. Forced travel lasts a total of
1 second.
10.8 Detection of open-circuit
The connecting line ensuring position feedback from the actuator to the basic unit is
monitored for open-circuit, which means that position feedback cannot fail without being
noticed.
Error
code
Diagnostic
code
Meaning for the LMV37.4... system
86 Bit 0
Valency 1
Open-circuit fuel actuator
87 Bit 0
Valency 1
Open-circuit air actuator
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