Terminal 37 Safe Stop Function - Danfoss VLT AQUA Drive FC 202 Instruction Manual

Introduction
Data for EN IEC 62061, EN IEC 61508, EN IEC 61800-5-2
1 1
- SIL 2 Capability, SILCL 2
- PFH (Probability of Dangerous failure per
Hour)=1e-10FIT=7e-19/h-9/h>90%
- SFF (Safe Failure Fraction) >99%
- HFT (Hardware Fault Tolerance)=0 (1001
architecture)
- Lifetime 20 years
Data for EN IEC 61508 low demand
- PFDavg for one year proof test: 1E-10
- PFDavg for three year proof test: 1E-10
- PFDavg for five year proof test: 1E-10
No maintenance of the STO functionality is needed.
Security measures have to be taken by the user, e.g.,
installation in a closed cabinet that is only accessible for
skilled personnel.
SISTEMA Data
Functional safety data is available via a data library for use
with the SISTEMA calculation tool from the IFA (Institute
for Occupational Safety and Health of the German Social
Accident Insurance) and data for manual calculation. The
library is complete and continually extended.

1.6.1 Terminal 37 Safe Stop Function

The adjustable frequency drive is available with safe stop
functionality via control terminal 37. Safe stop disables the
control voltage of the power semiconductors of the
adjustable frequency drive output stage. This in turn
prevents generating the voltage required to rotate the
motor. When the Safe Stop (T37) is activated, the
adjustable frequency drive issues an alarm, trips the unit,
and coasts the motor to a stop. Manual restart is required.
The safe stop function can be used as an emergency stop
for the adjustable frequency drive. In normal operating
mode when safe stop is not required, use the regular stop
function instead. When automatic restart is used, ensure
the requirements of ISO 12100-2 paragraph 5.3.2.5 are
fulfilled.
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VLT AQUA Drive
Instruction Manual
Liability Conditions
It is the responsibility of the user to ensure that qualified
personnel installs and operates the safe stop function:
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User is defined as: integrator, operator, service technician,
maintenance technician.
Standards
Use of safe stop on terminal 37 requires that the user
satisfies all provisions for safety including relevant laws,
regulations and guidelines. The optional safe stop function
complies with the following standards.
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The information and instructions of the instruction manual
are not sufficient for a proper and safe use of the safe stop
functionality. The related information and instructions of
the relevant Design Guide must be followed.
Protective Measures
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®
MG20M922 - VLT is a registered Danfoss trademark
Read and understand the safety regulations
concerning health and safety/accident prevention
Understand the generic and safety guidelines
given in this description and the extended
description in the relevant Design Guide
Have a good knowledge of the generic and safety
standards applicable to the specific application
IEC 60204-1: 2005 category 0 – uncontrolled stop
IEC 61508: 1998 SIL2
IEC 61800-5-2: 2007 – safe torque off (STO)
function
IEC 62061: 2005 SIL CL2
ISO 13849-1: 2006 Category 3 PL d
ISO 14118: 2000 (EN 1037) – prevention of
unexpected start-up
Qualified and skilled personnel are required for
installation and commissioning of safety
engineering systems
The unit must be installed in an IP54 cabinet or
in an equivalent environment. In special
applications, a higher IP degree is required
The cable between terminal 37 and the external
safety device must be short circuit protected
according to ISO 13849-2 table D.4
When external forces influence the motor axis (for
example, suspended loads), additional measures
are required (for example, a safety holding brake)
to eliminate potential hazards