207
8 Options
The damping element for the inductive proximity switch and the Namur sensor has to consist
of magnetic material.
For information about the distance between damping element and sensor refer to the sensor’s
data sheet.
If more than one damping element is used, all of them must be arranged in an absolute sym-
metric way.
NOTICE
Please note the manufacturers’ instructions of the frequency converter when connecting sig-
nals for the speed setpoint.
WARNING!
The VSM would send setpoint of the frequency converter input parallel to the current and volt-
age output.
Due to safety reasons, you may use only one output to control the frequency converter (actu-
ator element fuel/air duct and channel).
For a frequency converter requiring a potential-free release contact, you must use an external
relay.
FC = Frequency Converter input
NOTICE
To set up channel 4 (VSM100) on the BT300 control frequency converter must control com-
bustion air fan. The combustion air fan must adapt rotational speed according to frequency
converter.
Fig. 8-41 Inductive proximity switch with switch contact, 3-wire-system
BN = brown
BU = blue
BK = black
Fig. 8-42 Circuit of external relay for frequency converter
8.3.3.2 Terminal Assignment
Fig. 8-40 Namur Sensor, 2-wire system
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