Siemens LMV27.100x2 User Manual

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Building Technologies Basic Documentation LMV27... CC1P7541en
10 Electronic air-fuel ratio control 17.12.2018
10.3.2 Traveling speed/maximum curve slope
The time required to modulate from low-fire to high-fire can be set via parameter 544.
The following maximum curve slopes (positioning angle) can be achieved depending on
the set ramp-up time (parameter 544):
Type of
actuator
Positioning
speed
Modulation
32 s
Modulation
48 s
Modulation
64 s
Modulation
80 s
Positioning angle ²) Positioning angle ²) Positioning angle ²) Positioning angle ²)
Actuators (3 Nm) 5 s / 90° 31° 46° 62° 77°
Actuator SQM33.6 10 s / 90° 15° 22° 30° 37°
Actuator SQM33.7 17 s / 90° 9° 1) 13° 18° 22°
¹) Depending on the setting, the restriction of the maximum positioning angle does not permit the
maximum position of 90° to be reached
²) Maximum difference between 2 curve points
No. Parameter
544 Ramp modulating
The setting also acts outside the running position (refer to chapter Running speed).
Error
code
Diagnostic
code
Meaning for the LMV27
84 Bit 1
Valency 2..3
Fuel actuator: Curve too steep in terms of ramp speed
Bit 2
Valency 4..7
Air actuator: Curve too steep in terms of ramp speed
The setting also acts outside the operating position (refer to chapter Traveling speed).
10.3.3 Entering the running position
The burner is ignited when ignition position P0 is reached. When entering operating
phase 60, the actuators follow the defined curves until the low-fire position is reached
(20% or parameter 545).
No. Parameter
545
Lower output limit
undefined = 20 %
10.3.4 Operating position
As demanded by the load controller, the actuators are driven along the defined 20% and
100% curves. Point of ignition P0 can only be reached via the curve settings.

Siemens LMV27.100x2 Specifications

General

Brand	Siemens
Model	LMV27.100x2
Category	Controller
Language	English