29/171
Siemens Building Technologies
Basic Documentation LMU54... / LMU64...
CC1P7494en
HVAC Products
3 Functions
07.11.2002
Reinitialization
In the following cases, a reinitialization will be made or the parameterized control values
learned:
•
In the event of a fault in connection with the fan
•
In the event of a reset
•
After power ON
Especially in cases where the prepurge level deviates from the ignition level, the fan
speed needs a certain time to settle out just prior to ignition. Depending on the
application, this speed variation can give rise to more or less disturbance.
Parameter «Nachstell_Zaehler» can be used to adjust the permitted degree of fan
speed settling, or from when the change to ignition shall take place.
If a small value is parameterized (e.g. 1), ignition is effected immediately. The greater
the value, the less overshoot is permitted on ignition.
It should be noted that greater values extend the startup phase.
Tolerance of settling
process during startup
