Siemens LMV50 Series Manual page 45

Not LMV51.0 / LMV51.1
Β
Building Technologies
Additional speed-dependent air pressure switch
In this setting, an additional speed-dependent air pressure switch can be connected at
the input.
The input is evaluated depending on the actual speed of the VSD.
VSD air pressure switch ON
VSD air pressure switch OFF
Standard air pressure switch
Figure 29: Additional speed-dependent air pressure switch
Parameter FGR-PS/FCC (PS VSD)
This setting is linked to the following parameters:
Parameter RotSpeed PS on
RotSpeed PS off
Parameters RotSpeed PS on and RotSpeed PS off define the speed limit of the VSD
above which the connected extra air pressure switch is monitored.
When the current speed exceeds RotSpeed PS on, the air pressure switch must deliver
an ON signal.
When the current speed is below RotSpeed PS off, the air pressure switch must deliver
an OFF signal.
When the current speed lies between the 2 speed limits, the air pressure switch is not
valued.
The input is monitored during the phases from prepurging to postpurging and during the
valve proving phases.
An erroneous signal leads to shutdown.
Note!
If the input is set to PS VSD and the VSD is deactivated, the signal delivered by the air
pressure switch is not valued.
Basic Documentation LMV5...
4 Burner control
p
a
p
a
< Minimum
load
Speed (%)
E.g. E.g.
70 80
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CC1P7550en
22.05.2018