Translation of the original instructions
© 2020 all rights reserved to Festo SE & Co. KG
1
About this document
1.1
Purpose of the document
This document describes the use of the above-mentioned product.
The document contains additional information for the use of the product in safety-
oriented systems (safety handbook in accordance with IEC 61508).
1.2
Applicable documents
All available documents for the product
è
Document
Contents
Operating conditions EX
Information on the use of the product in poten-
tially explosive gas atmospheres
Certification documents
Test certificates for machine safety
Tab. 1 Applicable documents
1.3
Target group
The document is targeted towards individuals who install and operate the
product.
The document is additionally targeted towards individuals who are entrusted with
the planning and application of the product in a safety-oriented system.
1.4
Specified standards
Version
IEC 61508-1:2010
IEC 61508-7:2010
IEC 61508-2:2010
IEC 61511:2016
IEC 61508-4:2010
–
Tab. 2 Specified standards
2
Safety
2.1
General safety instructions
–
Only use the product in original status without unauthorised modifications.
–
Only use the product if it is in perfect technical condition.
–
Take into consideration the legal regulations for the installation location.
–
Take into consideration the ambient conditions at the location of use. Corros-
ive environments reduce the service life of the product.
–
Observe the specifications on the product labelling.
–
Observe labelling on the product.
–
Prior to mounting, installation and maintenance work: Switch off compressed
air supply and secure it from being switched back on.
–
Exhaust drive prior to assembly, installation and dismounting.
–
Product must be regularly tested by a qualified technician, and the test must
be documented
è
–
Protect the device from pressure fluctuations. Use overpressure valves and
pressure regulators.
Operating medium
–
Use compressed air only in accordance with the specifications
è
–
Use only unlubricated compressed air under normal conditions. Once the
product has been used with lubricated compressed air, it must continue to be
operated with lubricated compressed air only.
Return to Festo
Hazardous substances can endanger the health and safety of personnel and
cause damage to the environment. To prevent hazards, the product should only
be returned upon explicit request by Festo.
–
Consult your regional Festo contact.
–
Complete the declaration of contamination and attach it to the outside of the
packaging.
–
Comply with all legal requirements for the handling of hazardous substances
and the transport of dangerous goods.
2.2
Intended use
The product is intended to actuate process valves, such as ball valves and butter-
fly valves with a rotation angle from 0° (valve closed) to 180° (depending on the
version).
NOTICE!
The operating torque of the drive must not be greater than the maximum permiss-
ible torque listed in ISO 5211 in relation to the size of the mounting flange and of
the coupling.
2.2.1
Information on functional safety
2.2.1.1
Achievable safety classification
The product is suitable for use as an element in a safety-oriented system in
accordance with IEC 61511.
–
in Low Demand Mode up to SIL 2
–
in High Demand Mode up to SIL 1
Considering the necessary minimum hardware fault tolerance of HFT = 1, the
product can also be used up to SIL 3 in a redundant execution of the entire sys-
tem.
NOTICE!
The suitability for certain applications can only be determined in connection with
the assessment of further components of the subsystem. These must achieve the
same safety level.
2.2.1.2
Safety function
Single-acting semi-rotary drives DFPD-...-RS/DFPD-...-LS
The element safety function consists of the control valve moving to the switching
position when the compressed air is switched off. It is returned by spring force.
Double-acting semi-rotary drives DFPD-...-RD/DFPD-...-LD
The element safety function consists in the execution of a complete working
stroke (opening or closing the process valve) within a defined time.
2.2.1.3
Operating conditions
–
General information on safe operation
è
2.1 General safety instructions.
–
Periodic tests (function test)
è
–
Ambient conditions and additional technical specifications
è
2.2.1.4
Limitations of use
If used in a safety-oriented system, the service life is limited to 8 years subject to
compliance with the operating conditions.
–
Recommended interval for a complete function test: 1 year
–
Maximum permissible interval for a complete function test: 3 years
If function tests are negative, maintenance work must be performed immediately.
2.2.1.5
Characteristic values
Safety characteristic (in accordance with
IEC 61508)
Value
Probability of dangerous failure on demand
(Probability of Dangerous Failure on Demand)
PFD
spec
8.89 · 10
-4
Assumed test interval (Assumed Test Interval)
T
i
1 a
Confidence level (Confidence Level)
1-
á
95%
Hardware fault tolerance (Hardware Fault Tolerance)
HFT
0
Diagnostic coverage (Diagnostic Coverage)
DC
0
Type of subsystem (Type of Sub System)
Type A
Mode of operation (Mode of Operation)
Low Demand and
High Demand
Degree of detection of dangerous errors by the proof test
(Proof Test Coverage)
PTC
99%
Assumed demands per year (Low Demand Mode)
(Assumed Demands per Year)
n
op
1/a
Failure rate for dangerous errors not detected
(Lambda Dangerous Undetected)
ë
DU
1.01 · 10
-7
/h
Mean time to failure (dangerous)
(Mean Time to Failure dangerous)
MTTF
D
1.126 a
Low Demand Mode (double-acting)
Failure rate for dangerous errors not detected
(Lambda Dangerous Failure Rate)
ë
D
3.24 · 10
-7
/h
Mean probability of dangerous failure on demand
(Average Probability of Failure on Demand) 1oo1
PFD
avg
(T
I
= 1 a)
1.42 · 10
-3
Mean probability of dangerous failure on demand
(Average Probability of Failure on Demand) 1oo2
PFD
avg
(T
I
= 1 a)
1.44 · 10
-4
Low Demand Mode (single-acting)
Failure rate for dangerous errors not detected
(Lambda Dangerous Failure Rate)
ë
D
1.78 · 10
-7
/h
8147709
DFPD-...
Semi-rotary drive
8147709
2020-11d
[8147711]
Operating instructions
Festo SE & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
+49 711 347-0
www.festo.com
