Test Function For Approval Of Burner - Loss-Of-Flame Test (Tüv Test) - Siemens LMV37.4 Series Basic Documentation

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7.5.3.11. Test function for approval of burner – loss-of-flame
test (TÜV test)
The purpose of this test is to verify the detection time required in the event of loss of
flame when applying for burner approval. When starting the test, the fuel valves are shut
to determine the time (resolution of 0.2 seconds) until the basic unit detects loss of
flame.
Procedure:

Determine the burner output at which the test shall be made, using parameter 133
(fuel 0) or parameter 134 (fuel 1). If these parameters are not set, the test is carried
out at the current output of the system

Start the test by entering value 1 for parameter 124.
If the burner's output was defined for the test (parameter 133 or 134), the system
runs to that output first. To implement this function, the default value of parameter
121 (manual output) is used. This cancels any manual output that was previously
active

Now, the LMV37.4... shuts the fuel valves, leading to loss of flame

The evaluation is made by the basic unit by measuring the time the system requires
from fuel valve shutdown until loss of flame is detected.
Then, the required time is displayed in the form of diagnostic code C:7 (loss of
flame)
The resolution is 0.2 seconds.
Example
When the display reads C:7 D:10, the time required from valve shutdown to
detection of loss of flame is 2 seconds (D:10 means 10 x 0.2 = 2 seconds).
When the test is successfully completed, parameter 124 is reset to 0. If unsuccessful, a
negative value is delivered for diagnostic purposes and error code 150 is entered.
-1 = invalid phase (test only possible in phase 60) – display reads C:150 D: 1
-2 = default output < minimum output – display reads C:150 D:2
-3 = default output > maximum output – display reads C:150 D:3
-4 = manual abortion (no error, start variable was manually reset to 0) – display reads
C:150 D:4
-5 = timeout during TÜV test (no loss of flame after shutdown of valves within 50
seconds) – lockout C:150 D:5
Previously set output values at which the test shall be made (parameter 133 or 134)
remain stored.
Basic documentation LMV37.4...
7 Basic unit
CC1P7546en
20.09.2013