Siemens LMV37.4 Series Basic Documentation page 258

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Building Technologies
Software version V03.10

Optimization: If power supply fails during the restore process, the data set can be
repaired by starting a new restore process (since the backup / restore option is not
yet available with V03.00 because there is no suitable AZL2, this effect cannot
occur)

Optimization: When making a reset via the AZL2, an incomplete reset occurred in
very rare cases (display showed RESEt, but reset was not triggered)

Optimization: The time ascertained by the loss-of-flame test was 0.2 seconds too
long

Optimization: Reduced detection of undervoltage when fan motor is started in phase
22 (when a single-phase motor and the LMV37.4 were powered via the same
phase, undervoltage detection could occur on startup; in that case, the LMV37.4
was not operated as specified)

Optimization: Better overview through text changes of groups 200 = PAr0,
300 = PAr1 and 600 = ACtr on the parameter menu (initially PArA), and hiding of
unused parameters after selection of fuel train/operating mode

Optimization: Control of the fan output during standardization (standby) for using a
release contact via an external relay at the fan's output

Optimization: Curve setting invalid (OFF UPr) after new / further standardization

Optimization: To shorten the startup time, there is no referencing when postpurging
is aborted via load controller ON (direct start)

Automatic return travel of the SQN1 at the lower internal stop

Parameter on Siemens level
Longer ignition off time during the first safety time (increased from 0.4 to 0.6
seconds) to prevent wrong error diagnostics in connection with QRA2 (C:7 in place
of C:2)
Software version V03.30

Extension: Display of intensity of flame when setting the curves

Optimization: Display and diagnostics of changing start preventions
 Optimization: No unplausible relay setpoint (error C:99 D:3) when starting
standardization, alarm in case of start prevention and load controller ON signal

Optimization: No VSD standardization with pneumatic fuel-air ratio control
Optimization: Referencing in connection with direction of rotation Right and home
position 90°
Software version V03.40

Extension: Supports SQM33.6 or SQM33.7

Extension: Postpurging in the lockout position

Extension: Heavy oil operating modes

Optimization: Shutdown of VSD control when burner flange / safety loop is open

Optimization: Minimum setting for prepurge time: 5 seconds

Extension: Switching back to pilot function

Optimization: Standstill supervision of the VSD can be switched off in standby mode

Extension: No flame at the end of safety time repetition counter, adjustable air
pressure failure (OEM), heavy oil direct start (SO)

Extension: Air pressure supervision in operation with pneumatic fuel-air ratio control
can be switched off (OEM)

Extension: VSD ramp time increased to 40 seconds

Extension: Modbus data points
127 = Fuel 0 operating mode (parameter 201)
128 = Fuel 1 operating mode (parameter 301)
129 = Switching back to pilot cycle counter (parameter 176)
Basic Documentation LMV37.4...
30 Revision history of LMV37.4
CC1P7546en
17.12.2018