Introduction; Purpose Of This Operating Guide; Additional Resources; Functional Overview - Danfoss VLT FC Series Operating Manual

Safe Torque Off
Operating Guide

1 Introduction

1.1 Purpose of this Operating Guide

This Operating Guide provides information for use of Danfoss VLT® FC Series drives in functional safety applications. The manual
includes information about functional safety standards, Danfoss VLT® FC Series Safe Torque Off (STO) function, the related installa-
tion and commissioning, and service and maintenance for STO.
VLT is a registered trademark for Danfoss A/S.
®

1.2 Additional Resources

This manual is targeted at users already familiar with the VLT® drives. It is intended as a supplement to the manuals and instructions
available for download at www.danfoss.com. Read the instructions shipped with the drive and/or drive option before installing the
unit, and observe the instructions for safe installation.

1.3 Functional Overview

1.3.1 Introduction
The Safe Torque Off (STO) function is a component in a safety control system. STO prevents the unit from generating the power
required to rotate the motor.
Select and apply the components in the safety control system appropriately to achieve the required level of operational safety.
Before integrating and using STO in an installation, carry out a thorough risk analysis on the installation to determine whether the
STO functionality and safety levels are appropriate and sufficient.
The VLT® drive is available with:
• Safe Torque Off (STO), as defined by EN IEC 61800-5-2.
• Stop category 0, as defined in EN 60204-1.
The drive integrates the STO functionality via control terminal 37.
The VLT® drive with STO functionality is designed and approved suitable for the requirements of:
• Category 3 in EN ISO 13849-1.
• Performance Level "d" in EN ISO 13849-1.
• SIL 2 in IEC 61508 and EN 61800-5-2.
• SILCL 2 in EN 62061.

1.3.2 Products Covered and Identification

The STO function is available for the following drive types:
• VLT® HVAC Drive FC 102.
• VLT® Refrigeration Drive FC 103.
• VLT® AQUA Drive FC 202.
• VLT® AutomationDrive FC 301, enclosure size A1.
• VLT® AutomationDrive FC 302.
• VLT® Decentral Drive FCD 302.
• VLT® Parallel Drive Modules.
Identification
• Confirm that the drive is configured with the STO function by checking the unit type code on the nameplate.
Table 1: Type Code Identification
Product
VLT® HVAC Drive FC 102
Danfoss A/S © 2021.03
N O T I C E
Type code
T or U at digit 18 of the type code.
Introduction
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