7
©
Dinel, s.r.o. RFLS–28
This procedure has the following three steps:
•
Mechanical assembly
see Chapter
9
•
Electrical connection
see Chapter
5
•
Settings
see Chapter
6
4 . Installation and putting into operation
5 . Electrical connection
A sensor with PNP output can be loaded only by resistive or inductive load. The capacitative loads
and low resistance loads (bulb) are evaluated by the sensor as a short circuit.
Connection diagrams are listed in Figure below.
The RFLS-28 sensors are connected to evaluation units permanently by a PVC cable.
Electrical connection can only be made when de-energized!
The power supply must be designed as a stabilized source of low safe voltage with galvanic
isolation. If a switched power supply is used, its design must effectively suppress common
mode interference. If the switched power supply is equipped with a PE protective terminal,
it must be earthed without fail!
If the level meter (sensor) is to be installed in an outdoor environment more than 20 m from
an outdoor switchboard or an enclosed building, the electrical supply to the level meter
(sensor) must be supplemented with suitable overvoltage protection.
In case of a strong environmental electromagnetic interference, common routing of the signal
cable with power cable or in case of more than 30 m length, we recommend using a shielded
cable and grounding the shielding on the power source side.
Legend:
BK – black
BN – brown
BU – blue
Legend:
BK – black
BN – brown
BU – blue
WH – white
P
WH
Fig. 1: Sensor connection with PNP output, without programming cable
Fig. 2: Sensor connection with PNP output, with programming cable
