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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
Phases in
7471d51e/0111
Figure 110: Fan parameters settable as load values via QAA75…/AVS37…
The values of the phase sequence to be set via the operator terminal are set as load
values, either in the form of kW or as speeds in min
-1
. For the conversion of load values
to speed values, a speed-output characteristic is parameterized. The speed limits
defined by the OEM (safety-related values), which limit the values via the operator
terminal and which can only be set via the ACS420, are maintained as speed values
and cannot be entered as load values. If the values for the sequence of phases are
preset as load values in kW, they will directly be converted to speeds via the predefined
linear characteristic. The QAA fan speed parameters and QAA fan output parameters
use the same line numbers in the operator terminal. This means that the decision on
the setting (kW or min
-1
) must be made via the online DD which needs to be created.
An online change between output and speed parameters is not possible.
The output parameters are enabled via a factory setting at headquarters level.
Also the speed tolerance limits of the LMS14... continue to be preset as speed values
only.
The LMS14... merely provides a process to approximately determine the speed from a
predefined load. Whether the required (set) output is reached or whether it corresponds
to the setting for all operating states is not checked and is the responsibility of the user.
The linear equation for the load-speed conversion is to be defined by the OEM.
Equivalent load values are available for the following speeds (non-safety-related):
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