Samson 5825 Mounting And Operating Instructions - 1.1 Additional Electrical
A connected globe valve is moved to the fi-
nal position (valve CLOSED) with the
fail-safe action “Actuator stem extends”.
Caution!
Do not use the magnet for control tasks.
In Type 5825, there is no handwheel (2) on
the housing cover. Manual override is possi-
ble, after removing the front cover, using a
4 mm Allen key.
Typetesting
The Type 5825 Electric Actuators with
fail-safe action “Actuator stem extends” in
the force-locking version are typetested by
the German Technical Inspectorate (TÜV)
according to DIN 14597 in conjunction with
various SAMSON valves. The register num-
ber is available on request.
1.1 Additional electrical
equipment
The actuators can be equipped with a
positioner, if required. In addition, all actua-
tors can be equipped with two overridable
limit switches. The three-point stepping actu-
ator version can optionally be delivered with
a potentiometer.
Electric positioner
24 V actuators
can optionally be fitted with
a positioner.
Positioners compare the 0 (2) to 10 V or
4 (0) to 20 mA signal issued by the electric
control equipment with the position of the
potentiometer, which is proportional to
travel, and issue a three-point stepping out-
put signal to control the synchronous motor.
The positioner is suitable for normal and
split-range operation. The characteristic is
reversible (increasing >> or decreasing <>).
A 0 to 10 V signal can be taken at terminals
32 and 33 for position feedback.
Potentiometer
The potentiometer is linked to the gearing
and provides a resistance signal between 0
to approx. 1000
Ω
in proportion to the
travel. The resistance between approx. 0 to
800
Ω
can be used for feedback of the valve
travel.
Limit switches
The limit switches are activated by two cam
disks. The limit switches cannot be retrofit-
ted.
Priority circuit
The positioner version in conjunction with
limit switches can optionally be fitted with a
priority circuit (terminals 82 and 83).
EB 5824 EN
5
Design and principle of operation