1 Introduction
1.1 Purpose of the Manual
This manual provides information for use of Danfoss VLT
®
frequency converters in functional safety applications. The
manual includes information about functional safety
standards, Danfoss VLT
®
frequency converter Safe Torque
Off (STO) function, and the related installation and
commissioning as well as service and maintenance for STO.
VLT
®
is a registered trademark.
1.2 Additional Resources
This manual is targeted at users already familiar with the
VLT
®
frequency converters and is intended as a
supplement to the manuals and instructions available for
download at
www.danfoss.com/BusinessAreas/DrivesSo-
lutions/Documentations/VLT+TeDocumentation.htm
.
Read the instructions shipped with the frequency converter
and/or frequency converter option before installation of
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 voltage required to rotate the motor.
NOTICE
Select and apply the components in the safety control
system appropriately to achieve the desired 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
®
frequency converter 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 frequency converter integrates the STO functionality
via control terminal 37.
The VLT
®
frequency converter 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 types of
frequency converters:
•
VLT
®
HVAC Drive FC 102
•
VLT
®
Refrigeration Drive FC 103
•
VLT
®
AQUA Drive FC 202
•
VLT
®
AutomationDrive FC 301 enclosure type A1
•
VLT
®
AutomationDrive FC 302
Identification
•
Confirm that the frequency converter is
configured with STO function by checking the
unit typecode on the nameplate (see
Table 1.1
).
Product
Typecode
VLT
®
HVAC Drive FC 102
T or U at digit 17 of the
typecode
VLT
®
Refrigeration Drive FC 103
T at digit 17 of the typecode
VLT
®
AQUA Drive FC 202
T or U at digit 17 of the
typecode
VLT
®
AutomationDrive FC 301
enclosure type A1
T at digit 17 of the typecode
VLT
®
AutomationDrive FC 302
X, B or R at digit 17 of the
typecode
Table 1.1 Typecode Identification
Introduction
Operating Instructions
2
Danfoss A/S © 09/2014 All rights reserved.
MG37D202
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