Operation; Throttling Service; On/Off Service - Samson 3371 Mounting And Operating Instructions

7 Operation

The work described in this section is only to
be performed by personnel appropriately
qualified to carry out such tasks.
WARNING WARNING
! !
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,
air is vented during operation.
Î Wear eye and hearing protection when
working near the actuator.
WARNING WARNING
! !
Crush hazard arising from the moving
actuator stem.
Î Do not insert hands or finger into the
yoke while the air supply is connected to
the actuator.
Î Before working on the actuator, discon-
nect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actu-
ator stem by inserting objects into the
yoke.
Î Before unblocking the actuator stem after
it has become blocked (e.g. due to
seizing up after remaining in the same
position for a long time), release any
stored energy in the actuator (e.g. spring
compression). See 'Relieving the spring
compression in the actuator' in the
'Removal' section.
EB 8317 EN
WARNING
!
Risk of personal injury through incorrect
operation, use or installation as a result of
incorrect information on the actuator.
After any adjustment or conversion work, the
details on the actuator nameplate may no
longer be correct. This may apply, for
example, to the configuration ID or the
symbol after reversal of the direction of
action.
Î Immediately renew any nameplates or
labels with incorrect or outdated infor-
mation.
Î Add any new values to the nameplate. If
necessary, contact SAMSON to obtain a
new nameplate.

7.1 Throttling service

The Type 3371 Pneumatic Actuator with 120
and 350 cm² actuator areas is designed for
a maximum supply pressure of 6 bar when
used for throttling service.

7.2 On/off service

In on/off service, the supply pressure must
be limited depending on the bench range or
operating range of the actuator. The applica-
ble bench range or operating range which
the actuator can move through is written on
the nameplate (see the 'Markings on the de-
vice' section).
Actuator stem retracts (FE)
For the direction of action "actuator stem re-
tracts", the permissible supply pressure must
Operation
7-1