Samson 5824 Series - Design and Principle of Operation

12 EB 5824-2 EN
Design and principle of operation
3 Design and principle of oper-
ation
A stepper motor allows for supply by
frequency-independent voltages. The force of
the motor is transmitted to the actuator stem
(3) via gear and crank disk. When the
actuatorstemextends,theactuatorpiston(3)
pushes against the valve's plug stem. When
the actuator stem retracts, the return spring
in the valve causes the plug stem to follow
the movement (force-locking connection).
Actuator and valve are connected by the
coupling nut (4).
The positioner ensures a predetermined as-
signment of the valve position to the input
signal.Forpositionfeedback,a0to10V
signal can be picked off at terminals 32 and
33.
The characteristic and the input and output
signal settings can be changed using the
TROVIS-VIEW software (uEB6661).
Type 5824 without fail-safe action
The actuator without fail-safe action has a
handwheel (2) used to manually position the
valve. Travel and direction of action can be
read off the travel indication scale (9).
Type 5825 with fail-safe action
The actuators with fail-safe action largely
correspondstotheType5824described
above.However,theyalsoincludeaspring
mechanism(8)andanelectromagnet.
0
6
12
15
15
12
6
0
1099.18
7.2
2 1.17.1 1.2
4
5 6
3
1 2.1
ON
OFF
1 Housing
1.1 Front cover
1.2 Cable entry
2 Handwheel(Type5824only)
2.1 Actuating shaft
3 Actuator stem with actuator
piston
4 Coupling nut
5 Cam disk
6 Limit contact
7.1 Adjuster for limit contact
(bottom contact cam)
7.2 Adjuster for limit contact
(top contact cam)
8 Springassembly(Type5825
only)
9 Travel indication scale
9.1 Follower pin
10 Torque-dependent limit switch
Do not open the back
housing cover.
Fig.1: Type 5824/5825 Actuator (front cover open), with force-locking attachment to the valve