Introduction; Purpose Of This Operating Guide; Additional Resources; Functional Overview - Danfoss VLT AutomationDrive EZ FC 321 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® AutomationDrive EZ FC 321 drives in functional safety applica-
tions. The manual includes information about functional safety standards, Danfoss VLT® AutomationDrive EZ FC 321 Safe Torque Off
(STO) function, the related installation 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.
• The product can be used in the application area of EN IEC 62061.

1.3.2 Products Covered and Identification

The STO function is available for the following drive types:
• VLT® AutomationDrive EZ FC 321.
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® AutomationDrive EZ FC 321

1.4 Applied Standards and Compliance

Using the STO on terminal 37 requires that the user fulfills all provisions for safety, including relevant laws, regulations, and guide-
lines.
The integrated STO function complies with the following standards:
Danfoss A/S © 2022.11
N O T I C E
Type code
X, B, or R at digit 18 of the type code.
Introduction
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