Festo DLP-VSE Series, Manual

Page: 33 / 112

3. Installation
3-9
Festo P.BE-DLP-VSE-... en 0206a
Please note the following when connecting the 24 V load volt-
age (pin 5):
S
Observe the tolerance (20.4 V ... 28.8 V DC). Check the
24 V load voltage of the valve while your system is oper-
ating.
Potential equalization
The Local control unit has two earth connections for potential
equalization:
– on the operating voltage connection (pin 3)
– on the housing plate (see Fig. 3/12)
Please note
S
Always connect the earth potential to pin 3 of the oper-
ating voltage connection.
S
Connect the earth connection on the housing to the
earth potential with low impedance (short cable with
large cross-sectional area).
S
By means of low-impedance connections, you can be
sure that the housing of the Local control unit and the
earth connection at pin 3 have the same potential and
that there are no equalizing currents.
You thereby avoid faults caused by electromagnetic in-
fluences.