6 STR 0PA
1.8 Description
The STR 0PA electric actuator is controlled by 24 V DC voltage fed to the electric actuator’s
terminals according to the wiring diagram, resp. by 0/4/12 up to 20 mA, 4 up to 12 mA (0/2 up to 10 V)
(input control signal and provides for moving the output part of the EA automatically to a position
corresponding to the value of the input signal) and other functions as well.
The electric actuator consists of these main parts (Fig. 1):
The electric actuator is driven by an electric motor (1) supplied and controlled from the
source board (3) and control unit (2) of the DMS 3 electronics. Thrust switches (5) switched by
thumb are activated when switching thrust is reached.
Position of output element of EA is scanned by contactless absolute sensor (4).
Depending on the version, the DMS3 electronic circuit board may include an electronic
position switch (EPV) without power supply (passive) with output signal 4 through 20 mA.
Space heater (6) is placed at the control board.
In case of power cut or damage of switches the actuator can be controlled manually according
to instructions stated in chapter 4. Service and Maintenance.
Basic modules of DMS3 electronic control system for STR 0PA:
- Control unit (2) – main part of system DMS3 – it contains microprocessor, 6 signal LED and 4
buttons for simple adjustment and control of EA, connectors for connection of thrust scanner,
sourcing board and communication connector (connection to PC for adjustment and diagnostic),
2 free programmable relays R1 and R2,, 1 relay READY and terminals for electric connection.
- Sourcing board (3) – secures power supply of electronic, it contains user terminal board,
switching circuits, connector for connection with control unit.
- Position scanning unit (4) – secures contactless magnetic position scanning of output element.
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