Introduction
1
1
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
Off (STO) function, and the related installation and
commissioning as well as service and maintenance for STO.
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+Technical+Documentation.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.
Disclosure, duplication and sale of this document, as well
as communication of its content, are prohibited unless
explicitly permitted. Infringement of this prohibition incurs
liability for damages. All rights reserved with regards to
patents, utility patents and registered designs. VLT
registered trademark.
1.3 Functional Overview
1.3.1 Introduction
The Safe Torque Off (STO) function is a component in a
safety control system. Components in the system must be
selected and applied appropriately to achieve the desired
level of operational safety. STO disables the control voltage
of the power semiconductors of the frequency converter
output stage, which in turn prevents generating the
voltage required to rotate the motor.
The frequency converter can integrate the safety function
Safe Torque Off (STO, as defined by EN IEC 61800-5-2) and
Stop Category 0 (as defined in EN 60204-1). The frequency
converter is available with STO functionality via control
terminal 37.
Before integrating and using STO in an installation, a
thorough risk analysis on the installation must be carried
out to determine whether the STO functionality and safety
levels are appropriate and sufficient. The 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
2
®
VLT
Frequency Converters - Safe Torque Off Operating Instructions
®
frequency converter Safe Torque
®
MG37D102 - Rev. 2013-11-15
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
®
VLT
HVAC Drive
FC 102
®
VLT
Refrigeration
Drive FC 103
is a
®
VLT
AQUA Drive
FC 202
®
VLT
Automa-
tionDrive FC 301
enclosure type A1
®
VLT
Automa-
tionDrive FC 302
Table 1.1 Typecode Identification
Typecode
T or U at digit 17 of the typecode
T at digit 17 of the typecode
T or U at digit 17 of the typecode
T at digit 17 of the typecode
X, B or R at digit 17 of the typecode
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