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Building Technologies Basic documentation LMV37.4... CC1P7546en
12 Fan control 17.12.2018
12.11 Standardization of speed
Since the different types of fans operate at different speeds and signal handling should
be as straightforward as possible, all speeds in the LMV37.4 are standardized between
0% and 100%. For this reason, the VSD module uses a parameter which contains the
Standard speed (100% speed). All absolute speeds refer to this speed.
If changes to the VSD or the fan are made, speed standardization should be repeated.
Caution!
If automatic speed standardization is activated, or if the standardized
speed is changed, the settings of fuel-air ratio control must be checked!
Any change of the standardized speed alters the assignment between the
percentage values parameterized on the curves and the speed
When the parameter set (refer to ACS410 (J7352)) is restored, the
standardized speed is restored also.
If a data set is transferred to a new LMV37.4 via the restore process (e.g.
during a device replacement), the standardization of the speed must be
carried out again
In pneumatic fuel-air ratio control, at least one additional supervision
threshold (parameter 667, 668 or 669) must be activated to carry out a
speed standardization
No. Parameter
667 Minimum prepurge speed
668 Maximum ignition speed
669
Minimum / maximum speed limitation in operation
Index 0 = minimum speed
Index 1 = maximum speed
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