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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
. 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.
N O T I C E
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
Type code
VLT® HVAC Drive FC 102
T or U at digit 18 of the type code.
AQ313340186453en-00101 / 130R0544 | 5
Danfoss A/S © 2021.03
Introduction
Safe Torque Off
Operating Guide