Document No. 129-420

Installation Instructions

December 13, 2004

Installation

New Actuators, Remove Pre-load

GCA, GBB, GIB

GMA, GEB

EA1179R1

Figure 3. Determine Actuator Model and Orientation.

NOTE: For in-service actuators, skip Removing Pre- load. For new actuators, remove the factory- installed 5° pre-load.

Removing Preload

Before the External Auxiliary Switch can be installed on a new, out-of-the-box actuator, you must remove the factory-installed preload.

New Non-Spring Return Actuators

1.Insert shaft adapter at position A (See Figure 4).

2.Press the manual override button and move the shaft adapter counterclockwise until actuator reaches the internal stop (actuator will not move past this point).

3.Remove the shaft adapter and manually reinstall it against the external end stop at position B (See Figure 4).

4.Proceed with EAS installation.

B

A

90

90

PUSH

EA1190R1

Figure 4.

Insert Shaft Adapter at Position A.

New Spring Return Actuators

1.Without the shaft adapter installed, using the hex wrench, wind the manual override one full revolution and release the wrench (See Figure 5). The actuator will return to the 0° position and the preload is now removed.

Manual

Override

1-Turn

EA1192R1

Figure 5.

2.Manually install the shaft adapter against the external stop on the left end of the actuator. (See position B in Figure 4.)

Removing Factory Pre-load from New SR Actuator.

Preparing the Actuator Shaft Adapter

1.Remove the position indicator from an in-service actuator.

2.Determine the appropriate position adapter ring (See Figure 1).

3.Align and snap the three open notches on the edge of the EAS position adapter ring in place over the three raised stubs on the actuator shaft adapter. (See Figure 6).

NOTE:

GCA/GBB/GIB models use the larger ring.

GMA/GEB models use smaller ring. See Figure 1.

EA1177R1

Figure 6. Attaching the EAS Position Adapter Ring.

Page 2 of 5

Siemens Building Technologies, Inc.

Page 1 Page 3
Page 2
Image 2
Siemens ASC77.2U Installation, New Actuators, Remove Pre-load, Removing Preload, Preparing the Actuator Shaft Adapter
Page 1 Page 3

ASC77.2U specifications

The Siemens ASC77.2U is a state-of-the-art automation and control system designed to meet the growing demands of industrial processes in various sectors. This advanced system is renowned for its reliability, scalability, and adaptability, making it a vital component for modern factories and plants.

One of the main features of the Siemens ASC77.2U is its modular architecture. This allows users to customize the system based on their specific requirements, facilitating seamless integration with existing equipment and processes. The modular design also enables easy upgrades and expansions, ensuring that the system remains relevant and efficient as technology evolves.

Furthermore, the ASC77.2U incorporates cutting-edge technologies that enhance its operational capabilities. One of its key technologies is the use of advanced communication protocols, enabling real-time data exchange between devices and the control system. This feature significantly improves process monitoring and control, allowing for quicker responses to changing conditions and ensuring optimal performance.

Another standout characteristic of the ASC77.2U is its robust security features. In an era where cyber threats are increasingly prevalent, Siemens has equipped the ASC77.2U with comprehensive security measures. These include encrypted data transmission, user access controls, and regular software updates to protect the system against potential vulnerabilities.

Additionally, the ASC77.2U supports various diagnostic and troubleshooting tools. These tools provide system operators and technicians with valuable insights into performance issues, allowing for prompt intervention and minimizing downtime. The user-friendly interface further enhances usability, enabling personnel to navigate and operate the system with ease.

Energy efficiency is also a significant focus of the ASC77.2U. It incorporates technologies that optimize power consumption, contributing to sustainability goals while reducing operational costs. The system's ability to monitor energy usage in real-time helps organizations identify areas for improvement and implement energy-saving measures effectively.

In summary, the Siemens ASC77.2U represents a pivotal advancement in industrial automation and control systems. Its modular design, advanced communication capabilities, robust security features, effective diagnostic tools, and energy efficiency focus make it a premier choice for organizations looking to enhance their operational performance. As industries continue to evolve, the ASC77.2U stands ready to support businesses in achieving their automation goals while fostering a sustainable future.
Top Page Image Contents