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Building Technologies Basic documentation LMV37.4... CC1P7546en
HVAC Products 11 Fan control 01.12.2009
11.10 Parameterizing of the VSD
If the burner’s rated capacity is not reached at 95% (9.5 V) control, you can proceed as
follows:
- Set the maximum frequency to 105.3% of the motor’s rated speed
In the case of a motor frequency of 50 Hz, this means:
Set the maximum frequency of the VSD to 50 Hz x 1.053 = 52.6 Hz (on the VSD).
- Then, standardize the speed (refer to section Standardizing the speed)
There is no risk of motor overload since only 95% of the maximum control signal is de-
livered during standardization and, later in operation, the actual speed is controlled and
monitored.
Frequencies of between 50 Hz and 52.6 Hz are delivered only if these are needed for
reaching the required speed due to increased output.
- Set the ramp times of the VSD according to subsection Setting the ramp times
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