INVT EC30 Door Drive Retrofit Solution for International Elevator Door Systems

Abstract: In this project, INVT EC30 door elevator controller was successfully integrated with an international elevator brand door mechanism, utilizing the existing asynchronous (AM) door motor and encoder. Despite challenges in matching the existing encoder, stable operation was achieved through careful parameter tuning and commissioning optimization.

Keywords: EC30 Door Drive, Otis Door Mechanism, AM Door Motor, Encoder Feedback, Retrofit Solution.

Introduction

EC30 elevator door controller is a dedicated for elevator door systems. It's designed with smaller appearance structure, lightweight and compact size, ultra-thin plastic shell to be easier to install. It also has a wide range of applications and meets the needs of various elevator door control.

Features:

• Support induction and PM motors, incremental and absolute encoders

• Fully pulse running mode without limit switches, intelligent processing while pulse loss

• Auto speed curve generation without parameter adjustment

• Fully Comply with CE certification

• Advanced functions such as One-button debugging, obstacles detection, auto demonstration, and self-adaptation to working conditions.

Customer Requirements

The customer operating an international brand elevator door system required a reliable replacement for the existing door controller due to recurring door faults and aging electronic components. The key requirement was to retain the original asynchronous (AM) door motor and existing encoder while upgrading the control system in order to improve operational stability, reduce downtime, and simplify commissioning at site.

Challenges

• Integration of the EC30 door controller with a proprietary elevator door mechanism

• Ensuring compatibility with the existing asynchronous (AM) door motor

• Achieving stable operation using the existing encoder feedback, including encoder matching and signal optimization

• Ensuring smooth and accurate door operation without the use of mechanical limit switches

• Reducing commissioning time while minimizing long-term maintenance complexity

INVT Solutions

• Deployment of INVT EC30 Door Drive

• Reuse of Otis AM door motor and original encoder

• Closed-loop control using encoder feedback for precise door positioning

• Auto speed curve generation and self-learning functions

• One-button debugging for quick commissioning

• Intelligent obstacle detection and fault monitoring

This approach eliminated the need for motor or encoder replacement, reducing cost and installation time.

EC30 Model & Motor Configuration list:

Door drive terminals details:

Application wiring diagram:

System commissioning:

Fig. Door Drive and Motor

Result

• Smooth and precise door movement

• Stable operation with existing AM motor and encoder

• Significant reduction in door faults

• Commissioning time reduced by more than 50%

• No mechanical modifications required to Above system.

Customer Benefits

• Cost Saving: No replacement of motor or encoder required

• Improved Reliability: Stable door performance with reduced fault occurrence

• Faster Commissioning: One-button tuning and auto-learning features

• Reduced Maintenance: Simplified diagnostics and consistent operation

• Higher Customer Satisfaction: Improved door smoothness and response

Conclusion

The successful integration of the INVT EC30 door controller with a proprietary elevator door mechanism, utilizing an asynchronous (AM) motor and existing encoder, demonstrates EC30’s strong compatibility and retrofit capability. This solution provides a reliable, efficient, and economical upgrade path for legacy elevator door systems, enhancing operational performance while minimizing installation effort and overall cost.