Samson 5824 Series - Fail-Safe Action; Cover Screws; Additional Functions

EB 5824-2 EN 13
Design and principle of operation
3.1 Fail-safe action
The actuator moves to the fail-safe position
whentheelectromagnetisde-energized.This
causes the actuator stem to be completely re-
tractedorextendedbythespringmecha-
nism.
TheType5825Actuatorisavailablewiththe
fail-safeaction:
Actuatorstemextends: upon supply voltage
failure,theactuatorstemextends.
Actuatorstemretracts: upon supply voltage
failure, the actuator stem retracts.
Î The fail-safe action must not be used to
control the valve position.
TheType5825Actuatordoesnothavea
handwheel (2) on the housing cover. Manual
override is possible, after removing the front
cover,usinga4mmAllenkey.Theactuator
returns to its original position as soon as the
Allen key is released.
TestingaccordingtoDINEN14597
TheTypes5825ElectricActuatorwithfail-
safeaction"actuatorstemextends"istested
bytheGermantechnicalsurveillanceassoci-
ation(TÜV)accordingtoDINEN14597in
combination with various SAMSON valves.
Tested versions are indicated on the name-
plate. They are listed in the Technical data
table.
The registration number is available on re-
quest.
3.2 Cover screws
The actuator housing cover is fastened using
TORX PLUS
®
screws,size10IP.
Î To loosen and tighten the screws, the fol-
lowingscrewdriverscanbeused:
− TORX
®
T10
− TORX PLUS
®
10IP
− Flat-bladescrewdriverwith0.8mm
bladethicknessand4.0mmbladewidth
3.3 Additional functions
Devicesin24Vversioncanbettedwith
limit contactsasadditionalfunction:
− Optionally, the actuators can be
equipped with two limit contacts, which
are actuated by continuously adjustable
cam disks.
− The supply voltage as well as the inputs
and outputs are not galvanically isolated.
− The two additional limit contacts are not
suitableforretrotting.