Samson 3374 Series User Manual

EB 8331-4 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
TheType3374ElectricActuatorisusedin
industrial plants as well as in heating, venti-
lation and air-conditioning systems.
The actuator is a linear actuator. It is suitable
forform-tattachmenttovariousSAMSON
valve series, depending on the version with
or without fail-safe action.
TheType3374Actuatorisoptionallyavail-
ablewitheitherintegratedyoke(formA,see
Fig.3-1)orusinganM30x1.5ringnut
(formB,seeFig.3-2)includingtheneces-
sary stem connecting parts.
Fig.3-1: Construction with integrated yoke
(formB)
Fig.3-2: Construction for mounting with ring
nut (formA)
Principle of operation
The stepper motor is switched off by
torque-dependent limit switches in the end
positions or in case of overload. The force of
the motor is transmitted to the actuator stem
via gearing and ball screw.
3.1 Fail-safe action
The actuator versions with fail-safe action
contain a spring mechanism and an electro-
magnet. The actuator is moved by the force
of the spring to the fail-safe position when
the electromagnet (terminals L and N) is
de-energized. The direction of action de-
pends on the actuator version and cannot be
reversed.

Samson 3374 Series Specifications

General

Velocity Sensitivity	Yes
Aftertouch	No
Pitch Bend	Yes
Modulation Wheel	Yes
Control Knobs	8
Transport Controls	Yes
USB	Yes
MIDI Out	Yes
Type	MIDI Controller
Power Source	USB