This HTL encoder interface module is an option for variable speed drives of Altivar range. It is compatible with Altivar Machine ATV340 and Altivar Process ATV900 drives. It improves drive performance irrespective of the motor load state, zero speed torque, accurate speed regulation, torque accuracy, shorter response times on a torque surge, improved dynamic performance in transient state. It is protected against short circuits and overloads. It weighs 150g. It is used for Flux Vector Control operation with sensor (FVC mode) for asynchronous motors, or for Vector Control operation with speed feedback (FSY mode) for synchronous motors. It is inserted in a dedicated slot of the drive.