57
FMS Commissioning
O regulation
2
Commissioning
F
the electronic compound completely.
The integrated O regulator remains deactivated.
2
Set parameter 896 to 0 "No regulator”
or 3 " Only display ”.
Setting the correction
The integrated O regulator is connected inline and upstream of the
2
range and correction mode
FMS, as a free-standing program block. It acts exclusively on
correction input 1. The correction signal (actuation signal) transmitted to
the FMS is 0...100% with a resolution of 0.1%.
0% corresponds to maximum excess air, 100% to minimum excess air.
The factory setting is a correction mode of +60 / -40 when correcting for
air-valve / fan and -60 / +40 when correcting for fuel and a neutral value
(base setting with the O regulator switched off) of 50%.
2
This basic setting was selected on the assumption that over time, burner
and boiler contamination during their operation would result in the
installation's flow resistance increasing and thus a somewhat greater
actuation range in the excess air direction could be of benefit.
If some other correction mode is selected by means of parameter 437
(expert level), the base setting also alters at the same time.
With correction mode
Base setting
+50 % ___- 50%
50.0%
-50 %___+ 50%
50.0%
+70 %___- 30%
70.0%
-70 % ___+ 30%
30.0%
0 % ___-100%
0.0%
-100 % ___
0%
100.0%
The base setting can be called up when the O regulator is switched off,
2
e.g. when the burner is off, during burner start-up etc, by turning the selector
switch to Load (correction input) whilst simultaneously pressing the
Acceptance key.
Details and examples see "Correction input", page 63 - 64.
irst adjust