Samson 5827, Mounting And Operating Instructions, Page: 15 / 92

EB 5827-2 EN 3-1
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 (force-lock-
ing attachment), the plug stem follows the
movement of the actuator stem as a result of
the return spring in the valve.
When the actuator stem retracts (form-fit at -
tachment), the plug stem is connected to the
actuator stem and follows its movement.
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 ).
Version 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).
1 Housing
1.1 Front housing cover
1.2 Cable entry
2
Handwheel (Type 5827-Nxx only)
2.1 Actuating shaft
3
Actuator stem with actuator piston
4 Coupling nut
5 Cam disk
6 Limit contacts
7.1 Adjuster for limit contact
(bottom contact cam)
7.2 Adjuster for limit contact
(top contact cam)
8 Spring assembly (Types 5827-Axx
and 5827-Exx only)
9 Travel indication scale
9.1 Follower pin
10 Torque switch
7.1
7.2 5 6
3
4
9 10 2 2.1 1.1 1.2 1 8 9.1
Retracts
Extends
Fig. 3-1: Type 5827 Actuator (front cover open), force-locking attachment