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Upgraded variable speed drive without added complexity

10 Nov 2026

Invertek Drives is exhibiting its newest Optidrive E4 variable frequency drive, alongside its core product range, highlighting increased capability without added complexity. The Optidrive E4 is a general-purpose variable frequency drive (VFD) developed as an upgraded evolution of the popular Optidrive E3, but is not designed to replace it.

Dual-channel safe torque off (STO) certified to SIL3, USB-C and Bluetooth connectivity, industrial Ethernet communications, embedded diagnostics, and a built-in flight recorder are some of the features offered by the E4. 

The dual-channel STO provides enhanced safety required in many industrial applications; both independent channels must fail before torque is removed, providing SIL and PL e/Cat 3 safety and performance without relying on external contactors. Integrating the stop function into the drive simplifies safety-circuit design - speeding up emergency stops and removing the need for extra components and wiring. 

The communications architecture in the E4 has also been upgraded. USB-C connectivity makes it easy to connect mobile devices to the drive and allows in-box programming without the need for mains power. Industrial ethernet interfaces including PROFINET, EtherCAT, and Modbus TCP, enable real-time data exchange for precision control and diagnostics - supporting predictive maintenance strategies and enabling seamless integration with Industry 4.0 and IIoT systems. 

Optidrive E4 has been designed to support a wide range of motors including IE2 and IE3 induction motors, AC PM motors, brushless DC motors, SynRM, LSPM, and hybrid permanent magnet assisted reluctance (PMAREL) motors - delivering future-proof compatibility with the latest high-efficiency motor technologies. The precise current control algorithms in Invertek’s latest processor makes this possible - ensuring optimum torque production, superior thermal management and motor protection, reduced electromagnetic interference, and a built-in C1 EMC filter.

This content was created in paid collaboration with the Newsletter Editors Andy Pye and Bob Dobson. 

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