ST 1, STR 1 7
2. Description, function and specifications
2.1 Description and function
The ST 1, STR 1 electric actuators consist of three parts differing in their function.
The gear part is made up by a flange adapter, or with pillars with a flange with a connecting part for
connection onto a controlled device, and gears placed in the bottom; on the other side drive mechanisms for
control part units are surfaced.
The control part (Fig. 3) is placed on a control board (2) consisting of:
• an electric motor (7) (at single-phase version with capacitor)
• a thrust unit (controlled with a worm axial shift)
• a position-signalling unit (3) with a position transmitter (5)- positioner (resistive - potentiometer, capacitive or
an electronic position transmitter) and with a mechanical local position indicator
• a space heater with a thermal switch (8)
• electric connection is realised using terminal boards (6) (located in the control area) and cable bushings
(12), or connector with cable bushings
The STR 1 version is equipped with an electronic controller. The electronic controller allows automatic output
unit position adjustment in dependency on input signal value and provides additional functions.
Additional accessories:
Manual control: made up by a hand wheel with a worm gearing.
Local electric control module.
The STR version is equipped with an electronic controller. The position controller allows automatic position
adjustment of the EA output part depending upon the input signal value and provides also additional functions.
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