Danfoss VLT HVAC Drive FC 102 Operating Manual - Page 5

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Danfoss VLT HVAC Drive FC 102 Operating Manual
Introduction
Applied standards and compliance
Use of STO on terminal 37 requires that the user fulfills all
provisions for safety including relevant laws, regulations,
and guidelines.
The integrated STO function complies with the following
standards:

1.5 Symbols, Abbreviations, and Conventions

Abbreviation
Reference
Cat.
EN ISO 13849-1
DC
FIT
HFT
EN IEC 61508
MTTFd
EN ISO 13849-1
PFH
EN IEC 61508
PFD
EN IEC 61508
PL
EN ISO 13849-1
SIL
EN IEC 61508
EN IEC 62061
STO
EN IEC 61800-5-2
SS1
EN IEC 61800-5-2
SRECS
EN IEC 62061
SRP/CS
EN ISO 13849-1
PDS/SR
EN IEC 61800-5-2
Table 1.2 Abbreviations Related to Functional Safety
Conventions
Numbered lists indicate procedures.
Bullet lists indicate other information and description of illustrations.
Italicized text indicates:
•
Cross-reference.
•
Link.
•
Parameter name.
•
Footnote.
•
Parameter group.
•
Parameter option.
•
Alarms/warnings.
All dimensions in drawings are given in both metric and
imperial units (in brackets), for example: mm (in).
An asterisk (*) indicates the default setting of a parameter.
MG37D502
Operating Guide
•
•
•
•
•
Description
Category, level "B, 1–4"
Diagnostic coverage
Failure in time: 1E-9/hour
Hardware fault tolerance: HFT = n means that n+1 faults could cause a loss of the
safety function
Mean time to failure - dangerous. Unit: Years
Probability of dangerous failures per hour. Consider this value if the safety device is
operated in high demand or continuous mode of operation, where the frequency of
demands for operation made on a safety-related system is greater than one per year.
Average probability of failure on demand, value used for low demand operation.
Discrete level used to specify the ability of safety-related parts of control systems to
perform a safety function under foreseeable conditions. Levels a–e.
Safety integrity level
Safe Torque Off
Safe Stop 1
Safety related electrical control system
Safety related parts of control systems
Power drive system (safety-related)
Danfoss A/S © 01/2018 All rights reserved.
EN 60204-1: 2006 Stop category 0 – uncontrolled
stop
IEC/EN 61508: 2010 SIL2
IEC/EN 61800-5-2: 2007
IEC/EN 62061: 2005 SIL CL2
EN ISO 13849-1: 2008 Category 3 PL d
1
1
3