Design And Principle Of Operation - Samson 5824 Mounting And Operating Instructions

Design and principle of operation

3 Design and principle of oper-
ation
A stepper motor allows for supply by fre-
quency-independent voltages. The force of
the motor is transmitted to the actuator stem
(3) via gear and crank disk. When the actu-
ator 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). Ac-
tuator and valve are connected by the cou-
pling nut (4).
The positioner ensures a predetermined as-
signment of the valve position to the input
signal. For position feedback, an 0 to 10 V
7.1 8 9.1
6
7.2
ON
OFF
Fig. 1: Type 5824/5825 Actuator (front cover open), with force-locking attachment to the valve
12
9 1 10 2 2.1
5
3
4
Do not open the back
housing cover.
signal can be picked off at terminals 32 and
33.
The characteristic and the input and output
signal settings can be changed over the
TROVIS-VIEW software.
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.
1.1 1.2
1
1.1
1.2
2
2.1
3
4
5
6
7.1
7.2
6
8
9
9.1
10
Housing
Front cover
Cable entry
Handwheel (Type 5824 only)
Actuating shaft
Actuator stem with actuator
piston
Coupling nut
Cam disk
Limit contact
Adjuster for limit contact
(bottom contact cam)
Adjuster for limit contact
(top contact cam)
Spring assembly (Type 5825
only)
Travel indication scale
Follower pin
Torque-dependent limit switch
EB 5824-2 EN