Samson 3738-20, Mounting And Operating Instructions

Page: 31 / 84

EB 8390 EN 31
Connections
6 Connections
WARNING!
Mount the electronic limit switch,
keeping the following sequence:
−
Mount the electronic limit switch on
the actuator. See sections 5.1 and
5.2.
−
Connect the supply air. See sec -
tions 6.1 and 6.2.
−
Connect the electrical power. See
section 6.3.
−
Perform the start-up settings. See
section 8.
The connection of the power may
cause the actuator shaft/stem to
move, depending on the operating
mode.
Do not touch the actuator shaft/stem
or obstruct it to avoid risk of injury to
hands or fingers.
6.1 Pneumatic connections
NOTICE
Observe the following instructions to
avoid damaging the electronic limit
switch and/or solenoid valve.
−
Run and attach the connecting lines
and screw joints according to good
professional practice. Check them
for leaks and damage at regular
intervals and repair them, if neces-
sary. Before starting any repair
work, depressurize any open con-
necting lines.
− The air connection are designed as
threaded holes with G ¼ or ¼ NPT
thread depending on the device
version. Protect the exhaust air con -
nections or venting by installing a
filter or taking other appropriate
precautions to prevent water or dirt
from entering them.
− Operation using a pressure reduc-
ing valve: The K
VS
coefficient of an
upstream pressure reducing valve
must be at least 1.6 times larger
than the K
VS
coefficient of the de -
vice.
− Air pipe: The minimum nominal
size of the air pipe must be a pipe
with an inside diameter of ≥ 4 mm.
A larger nominal size is needed
when the connection length ex -
ceeds 2 m.
− Operation with external solenoid
valve
(Type 3738-20-xxx1000xxxx00)
The input pressure must not exceed
the maximum supply pressure of the
external solenoid valve (refer to the
specifications given by the solenoid
valve manufacturer). Do not remove
the blanking plug on the air port of
the mounting platform (3).
− The supply air must be dry and free
from oil and dust. The maintenance
instructions for upstream pressure
reducing stations must be ob-
served.
− Blow through all air pipes and hos -
es thoroughly before connecting
them.