User guide for Danfoss VLT® frequency converters with Safe Torque Off (STO) safety function, covering installation, setup, and safety compliance.
This manual provides operational guidance for Danfoss VLT® frequency converters equipped with Safe Torque Off (STO) functionality. It covers safety standards, installation procedures, setup instructions, and application examples. The STO function prevents motor torque generation during safety shutdowns, compliant with EN ISO 13849-1, CEI 61508, and EN 61800-5-2. It is intended for qualified personnel familiar with VLT® drives and safety systems.
The manual includes detailed sections on safety symbols, installation with PTC thermistor cards, parameter adjustments, restart behavior, and real-world safety applications categorized by SIL and PL levels. It also references Danfoss’s technical documentation and requires users to follow safety guidelines and perform post-installation testing. This manual is written in Spanish.
| Safety Category | Category 3 |
|---|---|
| Performance Level | Level d |
| Safety Integrity Level | SIL 2 |
| Compliance Standards | EN ISO 13849-1, CEI 61508, EN 61800-5-2 |
The STO function prevents the drive from generating torque to rotate the motor during safety shutdowns. It is part of a safety control system and complies with EN ISO 13849-1, CEI 61508, and EN 61800-5-2.
STO is available for VLT® HVAC Drive FC 102, VLT® Refrigeration Drive FC 103, VLT® AQUA Drive FC 202, VLT® AutomationDrive FC 301, VLT® AutomationDrive FC 302, VLT® Decentral Drive FCD 302, and VLT® Parallel Drive Modules.
The STO function complies with EN ISO 13849-1 Category 3, Performance Level d, CEI 61508 SIL 2, and EN 62061 SIL CL 2.