General Overview:
Electric double-motor actuators are designed for closed-loop control equipment, specifically for power stations. They are available in three types: M76348-D, M76348-E, and M76348-F, with cut-off torques of 750 Nm, 1500 Nm, and 3000 Nm respectively. These actuators are used for both open-loop and closed-loop control functions, with specific positioning times for safety considerations.

Technical Details:

• Motors: Three-phase motors with 3 PTC thermistors, available with or without brakes. Operating modes include S4/S5 intermittent duty and S2 short-time duty.
• Speeds: Drive shaft speeds for closed-loop control are 5 or 10 rpm, and for high-speed operation, they are 20, 40, or 80 rpm.
• Temperature Range: -20 to +60 °C.
• Protection Degree: Varies from IP54 to IP67 depending on the component.

Design and Operation:
The gear unit combines a primary spur gear, two self-locking worm gears, and a planetary gear. The actuators can be mounted in any position, but horizontal mounting requires support.

Electrical Data:
Motors are protected with 3 PTC thermistor temperature detectors. The rated power, speed, efficiency, and other electrical parameters are specified for different motor configurations.

Dimensional Drawings:
Detailed dimensions are provided for models M76348-D, M76348-E, and M76348-F, including space requirements for installation and maintenance.

Wiring Diagrams:
Wiring diagrams illustrate the connections for three-phase motors, including options for anti-condensation heaters and brake motors. The diagrams also cover the connection of switching and signaling units.

Additional Notes:
Operation with voltages higher than 60 V is not permissible as it can damage contact properties. The document includes detailed specifications for electronic position transmitters and space heaters.