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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.
1
7.1
8
7.2 5
Retracts
Extends
Fig. 3-1: Type 5827 Actuator (front cover open), force-locking attachment
EB 5827-2 EN
9.1
9
10
2 2.1
3
6
4
Design and principle of operation
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
1.1 Front housing cover
1.1 1.2
1.2 Cable entry
2
2.1 Actuating shaft
3
4
5
6
7.1 Adjuster for limit contact
7.2 Adjuster for limit contact
8
9
9.1 Follower pin
10
Housing
Handwheel (Type 5827-Nxx only)
Actuator stem with actuator piston
Coupling nut
Cam disk
Limit contacts
(bottom contact cam)
(top contact cam)
Spring assembly (Types 5827-Axx
and 5827-Exx only)
Travel indication scale
Torque switch
3-1
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