Woodward 3522-1009 EM-80/EM-300 Actuator System

EM-80/-300 System Description

The EM-80/-300 system consists of an actuator, a driver, an AC line filter

(required for marine TN/TT only), and interconnection cables.

The EM-80 and EM-300 are all-electric actuator systems that provide a nominal

40° of actuator output rotation. Each system consists of a three-phase brushless

ac motor which drives a high-precision planetary reduction gear box. A dedicated

driver controls the actuator position.

Actuator

The actuator is available in two versions, offering two work output levels, EM-80

and EM-300. Both versions use the same three-phase brushless AC motor.

The difference in output is achieved by the use of two different gearboxes. The

EM-80 uses a single-stage planetary 1:7 gear ratio, while the EM-300 uses a

two-stage planetary 1:20 gear ratio.

The motor–gearbox combination comes assembled on a mounting bracket with a

fixed hole pattern. Although the EM-300 is longer than the EM-80. both use the

same mounting hole pattern, allowing the actuators to be interchangeable.

The output flange provides an easy mounting surface for a variety of lever

configurations, and is equipped with a rugged pointer and scale for quick output

position reference while working on the prime mover. A breakaway extension and

two stop pins form a simple means of detecting whether the actuator has been

driven outside its operating boundaries.

Electrical connections are made in a standard, shielded, three-phase terminal

box mounted on the motor, and will accommodate standard cable. The resolver

cable has a 1 m (39”) flying lead that removes the connector from the high

vibration environment of the prime mover. The use of the specified resolver cable

and connector will help ensure correct connections to the driver.

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