Festo VOFC-LT-M32C Manual

Festo Ikke kategoriseret VOFC-LT-M32C

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Side 1/2
VOFC-LT-M32C
Valve
Festo SE & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
+49 711 347-0
www.festo.com
Operating instruction
8115806
2023-02a
[8101559]
8115806
Translation of the original instructions
© 2023 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. It contains
additional information for the use of the product in safety-related systems (safety
manual in accordance with IEC61508).
1.2 Applicable documents
–Assembly instructions
All available documents for the product
èwww.festo.com/sp.
1.3 Target group
This document is targeted towards individuals who mount and operate the
product. It 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 61508-4:2010
IEC 61508-2:2010 IEC 61511:2016
Tab. 1: Specified standards
2 Safety
2.1 Safety instructions
–Only use the product in its original condition without unauthorised modifica-
tions.
–Only use the product if it is in perfect technical condition.
–Observe the identifications on the product.
–Only use media in accordance with the specifications è10Technical data.
–The product must be regularly tested by a qualified technician, and the test
must be documented è9Maintenance.
Return to Festo
–In the event of malfunctions or failure: replace the product and inform Festo of
the failure.
–Before returning the product, contact your Festo specialist advisor.
2.2 Intended use
The valves VOFC-LT-M32C are directly actuated electromechanical control valves.
The consist of a basic valve of the VOFC-LT-M32C series in combination with a
solenoid coil of the VACC-S13 series. The valves are used to control pneumatic
actuators.
2.3 Training of qualified personnel
Work on the product may only be carried out by qualified personnel who can
evaluate the work and detect dangers. The qualified personnel have knowledge
and experience in process automation.
3 Additional information
–Contact the regional Festo contact if you have technical problems
èwww.festo.com.
–Accessories and spare parts èwww.festo.com/catalogue.
4 Information on functional safety
4.1 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 2.
Taking into account the necessary minimum hardware fault tolerance of HFT = 1,
the product can also be used up to SIL 3 with a redundant design of the entire
system.
NOTICE
It is only possible to determine whether the product is suitable for specific appli-
cations by also assessing further components of the subsystem.
4.2 Safety function
The safety function comprises the safe venting of an actuator connected to port 2.
The safety function is triggered by switching off the power supply at the solenoid
coil.
The connection between ports 2 and 3 remains open while the voltage remains
switched off at the solenoid coil. This switching position represents the safe state.
4.3 Operating conditions
–General information on safe operation
è2Safety.
–Periodic tests (performance test) è9Maintenance.
–Ambient conditions and additional technical specifications è10Technical
data.
4.4 Limitations of use
If the operating conditions are in compliance, the service life is a maximum of
14years.
5 Function
The valve is a 3/2-way valve with internal pilot air supply. If the operating pressure
is less than 2bar, an external pilot air supply with 2 bar must be connected.>
When the system is de-energised, the armature is pressed onto the nozzle by a
spring. This closes the internal pilot air line leading to the diaphragm.
–If voltage is applied at the solenoid coil: the armature opens the nozzle. The
diaphragm pushes the control piston against a spring in the final control ele-
ment. Exhaust port3 is closed and the flow rate between ports 1 and 2 is
unblocked.
–If there is no voltage at the solenoid coil: the compressed air supply from port1
is closed. Port 2is connected with exhaust port3. This allows a downstream
control unit to be exhausted.
Fig. 1: Circuit symbol
6 Assembly
1
2
3
4
Fig. 2: Mounting the solenoid coil on
the valve body
1
Vent screw
2
Spring washer
3
Solenoid coil
4
Armature guide tube
1. Ensure that moisture cannot accumulate in the valve.
2. Slide solenoid coil [3] onto the armature guide tube [4]. Check: sealing com-
pound points to the valve body.
3. Slide spring washer [2] onto the armature guide tube.
4. Tighten vent screw [1]. Tightening torque: 5Nm ±20%.
7 Installation
7.1 Requirements
–The piping is unpressurised.
–Connecting cables and fittings are clean.
–The power supply is switched off.
5.
6.
7.2 Pneumatic installation
–Recommended: use feed line with 6 mm cross-section.³
–Use only fittings with cylindrical threaded stud and sealing ring or cutting ring.
–Do not use additional sealing agents such as PTFE sealing band or hemp.
–Do not use anti-friction coating or lubricant.
–If port1 is pressurised with a 2bar control signal, supply 2bar auxiliary< >
energy to port12.
For outdoor applications
NOTICE
Moisture, foreign matter and other contamination that enters the valve can
damage the product and affect its function.
• Ensure that there is ventilation.
• Use exhaust protection.
–Duct exhaust air
–Use exhaust protection VABD-D3-….
7.3 Electrical installation
–Take suitable measures for the protective circuit to limit peak disconnection
voltages.
–Any polarity.
1
2
3
Fig. 3: Electrical connection of
solenoid coil
1
Cable
2
Cable fitting
3
Cover
1. Loosen the screw of the terminal housing and open the cover [3].
2. When loosening the cap nut of the cable fitting [2] hold the lock nut on the
housing in position to prevent it from loosening (use second spanner).
3. Guide the cable [1] through the cable fitting and wire it to the terminals.
4. Connect the solenoid coil to the local equipotential bonding via the inner or
outer protective earth connection.
Tighten the cap nut of the cable fitting [2].
–Tightening torque: 4.3 Nm ± 10%
Close the cover [3] of the terminal housing and tighten the screw.
–Tightening torque: 1.2 Nm ± 20%
7. Functional test: operate the solenoid valve a few times and check that it
functions correctly.
8 Commissioning
• After complete assembly and installation, check and document the safety
function.
9 Maintenance
9.1 General
–When used as intended, the product is maintenance-free.
–Repairs to the product are not permissible. In the event of malfunctions or
failure: Replace the product and let Festo know about the failure. Return defec-
tive products to Festo.
9.2 Proof test (Proof test)
The proof test consists of switching off the voltage at the solenoid valve and then
switching it on again.
During the proof test, the safety of the application must be ensured.
1. Switch off the voltage at the solenoid coil.
2. Measure the time until the pressure at port2 has completely reached the
ambient pressure (reached the safe state).
ÄThe test is successful if the safe state is reached within the given time
and a downstream final control element has moved to its intended posi-
tion.
3. Switch on the voltage at the solenoid coil.
ÄThe test is successful if the pressure at port2 has reached the original
value.
4. Check the valve externally, visual inspection.
ÄThe test is successful if no defect, leakage or contamination is detected.
5. Document the test results.
10 Technical data
10.1 Technical data, safety engineering
Approval information, safety engineering
CE
Type-examination The functional safety engineering of the product has been
certified by an independent testing body, see EC-type
examination certificate èwww.festo.com/sp
Certificate issuing authority TÜV Rheinland Industrie Service GmbH
Certificate no. 968/V 1251.00/21
Tab. 2: Approval information, safety engineering
Safety characteristic in accordance with IEC
61508
Value
Safety function Moving to the safe position by switching
off the power supply
Results of Assessment
Route of Assessment 2H/1S
Type of Subsystem Type A
Mode of Operation Low Demand Mode/High Demand Mode
Hardware Fault Tolerance HFT 0
Systematic Capability SC 3
Low Demand Mode
Dangerous Failure Rate ëD1.18 * 10-7/h
118 FIT
Average Probability of Failure on Demand
1oo1
PFD
avg(T1) 5.25 * 10-4
Assumptions: DC = 0%, T1= 1 year,
MRT = 72 h
Average Probability of Failure on Demand
1oo2
PFD
avg(T1) 5.28 * 10-5
Assumptions: DC = 0%, T1= 1 year,
MRT = 72 h, ß
1oo2 = 10%
High Demand Mode
Nominal Lifetime in accordance with
EN13611:2007+A2:2011K.4.6
B
10d 1,478,101
Average Frequency of a Dangerous
Failure per Hour
PFH 6.8 * 10
-8/h
Tab. 3: Safety characteristics
10.2 Technical data, general
VOFC-LT-M32C-… -…14 -…12
Mounting position any
Medium Compressed air to ISO 8573-1:2010[7:2:2]
Temperature of medium [°C] –25…60
Ambient temperature [°C] –25…60
Storage temperature [°C] –20…40
Corrosion resistance class
CRC
4
Degree of protection (in
mounted state)
IP65
Operating pressure [MPa] 0.1…0.8 0.2…0.8
[bar] 1…8 2…8
[psi] 14.5…116 29…116
Operating pressure with
external pilot air
[MPa] 0…0.8
[bar] 0…8
[psi] 0…116
Tab. 4: Technical data

Produkt Specifikationer

Mærke: Festo
Kategori: Ikke kategoriseret
Model: VOFC-LT-M32C

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