Festo MS6-SV Series User manual

MS6-SV-...-D-10V24
Soft-start/quick exhaust valve
Operating instruc-
tions
8164008
2022-06c
[8164010]

Translation of the original instructions

Festo — MS6-SV-...-D-10V24 — 2022-06c
3
Table of contents
1 About this document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Applicable documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Target group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Specified standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Intended use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Foreseeable misuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4 Training of qualified personnel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Additional information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Product overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Product design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3 Information on functional safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3.1 Safety function in accordance with EN ISO 13849. . . . . . . . . . . . . . . . . . . . . . . 12
5Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Mounting clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Assembly with MS-series service unit components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2 Pneumatic installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.3 Electrical installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1 Maintenance work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.2 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10 Malfunctions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10.1 Fault clearance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
11 Dismantling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12.1 Safety data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12.2 Technical data, mechanical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
12.3 Technical data, pneumatic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
12.4 Technical data, electrical. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
12.5 Filling flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12.6 Exhaust time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4
Festo — MS6-SV-...-D-10V24 — 2022-06c
Safety
1 About this document
This document describes the use of the soft start/quick exhaust valve.
The document contains additional information for use of the product in safety-related systems (safety
handbook in accordance with IEC 61508).
1.1 Applicable documents
All available documents for the product è www.festo.com/sp.
1.2 Target group
The 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.
1.3 Specified standards
Version
EN ISO 4414:2010-11 EN ISO 13849-2:2012-10
EN ISO 13849-1:2015-12 EN ISO 14118:2018-02
Tab. 1: Standards specified in the document
2Safety
2.1 Safety instructions
–Only use the product in its original condition without unauthorised modifications.
–Only use the product if it is in perfect technical condition.
–Observe the identifications on the product.
–Take into account the ambient conditions at the location of use.
–Before working on the product, switch off the power supply and secure it against being switched on
again.
–Observe the tightening torques. Unless otherwise specified, the tolerance is ± 20%.
–Only use compressed air as an operating medium in accordance with the specification è 12 Tech-
nical data.
2.2 Intended use
The product is intended solely for fast and safe venting and for slow pressurisation of pneumatic
piping systems and terminals in industry.
The product is intended for installation in machines or automation systems and must be used exclu-
sively as follows:
–in an industrial environment
–within the limits of the product defined by the technical data è 12 Technical data.
–in its original condition, without unauthorised modifications
–in perfect technical condition
–in standard operation, which includes standstill, set-up and service operation, as well as emergency
operation

Festo — MS6-SV-...-D-10V24 — 2022-06c
Additional information
5
2.3 Foreseeable misuse
The following are examples of foreseeable misuse and are not approved as intended use:
–outdoor operation
–use as a press safety valve
–bypass of safety function
–use in reversible operation with reversal of supply air and exhaust air
–vacuum operation
2.4 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 skills and experience in dealing with electropneumatic
(open-loop) control technology.
3Additional information
–Contact the regional Festo contact if you have technical problems è www.festo.com.
–Accessories and spare parts è www.festo.com/catalogue.

6
Festo — MS6-SV-...-D-10V24 — 2022-06c
Product overview
4 Product overview
4.1 Product design
1
2
3
4
5
6
7
8
9
10
11
Fig. 1: Operating elements and connections
1
Coil connection pilot valve V1
2
Coil connection pilot valve V2
3
Pneumatic port 2 (output pressure p2)
4
Pressure indicator (optional)
5
Proximity switch S2
6
Proximity switch S1
7
Silencer mounted at pneumatic port 3
8
Slot for proximity switch S3
9
Valve body
10
Pneumatic port 1 (operating pressure p1)
11
Flow control screw for soft-start function
4.2 Function
The product changes from the normal position to the switching position when both coils are energised
simultaneously. The normal position is achieved by switching off both coils.

Festo — MS6-SV-...-D-10V24 — 2022-06c
Product overview
7
The product has two safety functions:
–Pressure release
–Protection from unexpected start-up (non-switching)
The product has queries from proximity switches, which are intended for diagnostics of the internal
valves. Performance level d/e in category 3 can be achieved by using proximity switches S1 and S2.
Performance level e in category 4 can be achieved by using an additional proximity switch S3.
Circuit symbol Function
Soft-start/quick exhaust valve, electrically actuated.
Tab. 2: Circuit symbol for the function
Designations
Port Identifier Functional principle Position
Port 1 (operating pressure p1) 1 Pneumatic è 4.1 Product design.
Port 2 (output pressure p2) 2
Port 3 (exhaust p3) 3
Coil connection pilot valve V1 V1 Electric
Coil connection pilot valve V2 V2
Proximity switch S1 S1 Magnetic
Proximity switch S2 S2
Proximity switch S31) S3
Flow control valve DR Mechanical system
1) Optional.
Tab. 3: Interfaces
Switching logic
In the normal position (completely exhausted product), the pilot valves V1 and V2 are not actuated. If
both pilot valves are actuated, the product switches first to the switching position 1 and then, when
the switch-through pressure is reached, automatically into switching position 2 è Fig. 2.

8
Festo — MS6-SV-...-D-10V24 — 2022-06c
Product overview
V1 V2 S1 S2 S3 MS6-SV-...-D
Voltage [V] Switching position Status
0 0 1 1 1 Normal position
Port 1 blocked, passage from port 2 to 3 opened.
24 0 0 1 1 Normal position, optional testing condition è Tab. 6
Recommendation for actuation and diagnostics.
Port 1 blocked, passage from port 2 to 3 opened.
0 24 1 0 1 Normal position, optional testing condition è Tab. 6
Recommendation for actuation and diagnostics.
Reduced flow rate via flow control valve from port 1 to
2, passage from port 2 to 3 opened.
24 24 0 0 1 Switching position 1.
Reduced flow rate over flow control valve from port 1
to 2, passage from port 2 to 3 blocked.
24 24 0 0 0 Switching position 2.
Full flow rate from port 1 to 2, passage from port 2 to
3 closed.
Tab. 4: Switching logic
Switching characteristics
Switching behaviour of the product's internal valves. The normally exhausted position is sensed by the
proximity switch. Switching logic è Tab. 4 Switching logic.

Festo — MS6-SV-...-D-10V24 — 2022-06c
Product overview
9
Time t
0.3 … 1 MPa
3 … 10 bar
43.5 … 145 psi
50 % of p1
0.3 … 1 MPa
3 … 10 bar
43.5 … 145 psi
Output pressure p2
Operating pressure p1
Pilot valve V1
1 = 24 V, 0 = 0 V
Pilot valve V2
1 = 24 V, 0 = 0 V
Proximity sensor S1
1 = 24 V, 0 = 0 V
Proximity sensor S2
1 = 24 V, 0 = 0 V
Proximity sensor S3
1 = 24 V, 0 = 0 V
Fig. 2: Input and output switching behaviour in normal status
Proximity switch reaction times1)
Switching on Switching off
t1Depending on p1, flow control valve set-
ting and system volume at p2.
tS1.1 Maximum of 4 s after signal at V1. tS1.2 Maximum of 4 s after signal drop at V1.
tS2.1 Maximum of 4 s after signal at V2. tS2.2 Maximum of 4 s after signal drop at V2.
tS3.1 After signal at V1 and V2. Depending on
p1, flow control valve setting and system
volume at p2.
tS3.2 Maximum of 5 s after signal drop at V1
and V2. Depending on system volume at
p2.
1) After the reaction time, the signals are applied statically. The maximum specified reaction times must be considered in the diagnos-
tics. These reaction times are normally shorter.
Tab. 5: Proximity switch reaction times
Switch-through pressure
There is a flow control screw in the cover of the product. The flow control screw can be used to
generate a gradual pressure build-up of output pressure p2 è 12.5 Filling flow.

10
Festo — MS6-SV-...-D-10V24 — 2022-06c
Product overview
The flow rate and thus the pressure rise can be adjusted by turning the flow control screw. When
output pressure p2 reaches about 50% of operating pressure p1, the maximum flow rate performance
is enabled.
1
2
Fig. 3: Switch-through pressure tolerance field
1Ratio of p2 to p1 [%] 2Filling time t
Actuation and diagnostics
If the results of actuation and the sensor signals S1, S2 and S3 are not plausible, carry out the
following measures:
1. Switch off voltage to pilot valves V1 and V2.
2. Output error message.
3. Prevent new switching.
Sequence Activity Status and status transitions
Diagnostics at each switching operation
1. Apply voltage to pilot valves V1 and V2. V1 = 1; V2 = 1
2. Record edge change at proximity switches
S1 and S2.
S1 = 1 à 0; S2 = 1 à 0
Optional, when using a third proximity switch S3
3. Record edge change at proximity switch
S3.
S3 = 1 à 0
Corresponding reaction times è Fig. 2.

Festo — MS6-SV-...-D-10V24 — 2022-06c
Product overview
11
Sequence Activity Status and status transitions
Diagnostics at every reset to the normal position
1. Switch off voltage to pilot valves V1 and
V2.
V1 = 0; V2 = 0
2. Record edge change at proximity switches
S1 and S2.
S1 = 0 à 1; S2 = 0 à 1
Optional, when using a third proximity switch S3
3. Record edge change at proximity switch
S3.
S3 = 0 à 1
Corresponding reaction times è Fig. 2.
Diagnostics in normal position
Pay attention to forced switch on/off è 12.1 Safety data.
1. Apply voltage to pilot valve V1. V1 = 1
2. Record edge change at proximity switch
S1.
S1 = 1 à 0
3. Switch off voltage to pilot valve V1. V1 = 0
4. Record edge change at proximity switch
S1.
S1 = 0 à 1
5. Apply voltage to pilot valve V2. V2 = 1
6. Record edge change at proximity switch
S2.
S2 = 1 à 0
7. Switch off voltage to pilot valve V2. V2 = 0
8. Record edge change at proximity switch
S2.
S2 = 0 à 1
Corresponding reaction times è Fig. 2.
Tab. 6: Recommendation for actuation and diagnostics

12
Festo — MS6-SV-...-D-10V24 — 2022-06c
Product overview
4.3 Information on functional safety
4.3.1 Safety function in accordance with EN ISO 13849
The product achieves a performance level for the following safety functions:
–safe venting
–Protection against unexpected start-up (pressurisation) after EN ISO 14118
NOTICE
Loss of the safety function
Common cause failures (CCF) cause the failure of the safety function, since in this case both channels
in a two-channel system fail simultaneously.
If measures to control the CCFs are not observed, the safety function of the soft-start/quick exhaust
valve can be impaired.
•Make sure that the described measures are observed è Failures due to a common cause (Common
Cause Failure – CCF).
è 12.1 Safety data
NOTICE
Loss of the safety function
Non-compliance with the technical data can lead to loss of the safety function.
• Observe the technical data è 12 Technical data.
Failures due to a common cause (Common Cause Failure – CCF)
To achieve the desired performance level, the applicable measures against CCF must be implemented
in accordance with the specifications of EN ISO 13849-2.
PFHd value
The PFHd value depends on the model of the product and the annual actuation rate (nop).

Festo — MS6-SV-...-D-10V24 — 2022-06c
Product overview
13
PFHd value MS6-SV-…-D
1
2
Fig. 4: PFHd value MS6-SV-…-D
1PFHd [10 -7] 2Actuation rate (nop) [10 4/a]
PFHd value MS6-SV-…-D-S3
1
2
Fig. 5: PFHd value MS6-SV-…-D-S3
1PFHd [10 -8] 2Actuation rate (nop) [10 4/a]

14
Festo — MS6-SV-...-D-10V24 — 2022-06c
Assembly
5 Assembly
Information about mounting the module connector, connecting plate and mounting bracket can be
found in the instruction manual enclosed with the relevant accessories.
5.1 Mounting clearances
NOTICE
Loss of the safety function
Failure to comply with the minimum distance of 15 mm between the silencer and base can result in the
loss of the safety function.
• Observe the minimum distance of 15 mm below the silencer è Fig. 6.
The free space ensures the exhaust can escape.
Fig. 6: Mounting
5.2 Preparation
•Observe the flow direction from port 1 to port 2. Numbers 1 and 2 on the housing è Fig. 7 are
provided for orientation.

Festo — MS6-SV-...-D-10V24 — 2022-06c
Assembly
15
12
Fig. 7: Flow direction
5.3 Assembly with MS-series service unit components
WARNING
Loss of the safety function
If devices that impair the exhaust are placed behind the pneumatic connection 2 of the soft start/quick
exhaust valve, this can result in loss of the safety function.
• Only place devices that do not impair the exhaust downstream of pneumatic connection 2.

16
Festo — MS6-SV-...-D-10V24 — 2022-06c
Installation
1
2
3
Fig. 8: Assembly
1. Slide the cover cap MS6-END 1 upwards and remove it.
2. Insert a seal 2 between the separate devices (module connector in scope of delivery).
3. Place the module connector 2 in the slots of the separate devices.
4. Fasten the module connector with two screws (module connector in scope of delivery).
Tightening torque: maximum 1.2 Nm
6 Installation
6.1 Safety
WARNING
Risk of injury from compressed air.
• Before carrying out installation and maintenance work, switch off the compressed air supply.
6.2 Pneumatic installation
Port 1 and 2
If using screw connectors:
1. Note the screw-in depth of the connector thread: 10 mm.
2. Make sure that the compressed air lines are connected correctly.
3. Screw the fittings into the pneumatic ports using a suitable sealing material.

Festo — MS6-SV-...-D-10V24 — 2022-06c
Installation
17
Port 3
Exhausting a system using the product results in high noise levels.
• Recommendation: use silencer è www.festo.com/catalogue.
1. Screw the silencer into pneumatic port 3.
2. Make sure that the exhaust is unrestricted. Neither the silencer nor port 3 may be blocked.
6.3 Electrical installation
WARNING
Risk of injury due to electric shock.
• For the electrical power supply with extra-low voltages, use only PELV circuits that guarantee a
reinforced isolation from the mains network.
• Observe IEC 60204-1/EN 60204-1.
Connecting the product
•Connect pilot valves and proximity switches.
Example of circuits
Fig. 9: Example of circuits

18
Festo — MS6-SV-...-D-10V24 — 2022-06c
Maintenance
Designations
S1 Proximity switch S1
S2 Proximity switch S2
S3 Proximity switch S3
V1 Pilot valve 1
V2 Pilot valve 2
Pot.-free Potential-free contact
Emergency Stop Emergency stop (input circuit)
Feedback Loop Feedback circuit
Safety Device Safety relay unit or safety PLC
Digital Output Digital output
Digital Input Digital input
Standard PLC Programmable logic controller
Tab. 7: Designations in circuit examples
7 Commissioning
The product does not have its own control logic and must therefore be integrated into the control
system through appropriate measures.
Graphic representation of the switching behaviour è Fig. 2.
Proceed as follows to commission the product:
• Apply operating pressure p1.
ÄThe product is now ready for operation and can be actuated.
The filling speed of the pneumatic system can be adjusted with the flow control valve è Fig.
1.
8Operation
Perform a forced switch-off at least once a month if the process-related switching frequency is lower.
9 Maintenance
9.1 Maintenance work
A dirty silencer can extend the time needed for exhausting the system and thus restrict the safety
function.
• Check the silencer regularly and replace if necessary.

Festo — MS6-SV-...-D-10V24 — 2022-06c
Dismantling
19
9.2 Cleaning
1. Switch off energy sources:
–Operating voltage
–Compressed air
2. If necessary, clean the product on the outside. Soap suds (max. +50 °C), petroleum ether and all
non-abrasive cleaning agents may be used.
10 Malfunctions
10.1 Fault clearance
–Check compressed air supply
–Check power supply
–Check installation of the signal lines
–Start device è 7 Commissioning.
–Implement possible remedies è Tab. 8 Fault clearance.
–If the fault occurs again: contact Festo service è www.festo.com.
Malfunction Possible cause Remedy
Product does not switch Power supply is insufficient –provide sufficient power supply.
Pressure supply interrupted –Restore compressed air supply.
Malfunction due to electrical
or electromagnetic effects
(EMC measures not in com-
pliance).
–note maximum length of the signal
lines.
–Run the control and power lines sep-
arately.
–use screened cables.
–Provide low-impedance paths to
earth.
Pressure p1 collapses briefly
at every switching operation
The cross-section of
the MS6-SV-...-D pressure
supply is too small.
–Tighten flow control screw a little.
–Attach reservoir in front of input p1.
–Modify the compressed air supply,
e.g. increase cross-section of the
power supply cable.
Tab. 8: Fault clearance
11 Dismantling
1. Switch off the energy sources
–Operating voltage
–Compressed air
2. Disconnect the applicable connections from the product.

20
Festo — MS6-SV-...-D-10V24 — 2022-06c
Technical data
12 Technical data
12.1 Safety data
Safety characteristics MS6-SV-...-D
Safety function Safe venting and protection against unexpected pressuri-
sation
Service-life value B10 0.9 mill. switching cycles
Service life [years] 20
Achievable performance level (PL) in accordance with EN ISO 13849-1
With sensing of S1 and S2 Category 3, PL d or category 3, PL e1)
With sensing of S1, S2 and
S3
Category 4, PL e
Probability of dangerous failure per hour
PFHd value MS6-SV-...-D è Fig. 4.
PFHd value MS6-SV-...-D-S3 è Fig. 5.
CCF measures Relevant requirements EN ISO 13849-2 è Failures due
to a common cause (Common Cause Failure – CCF).
Note on forced checking pro-
cedure
Switching frequency min. 1/month
1) Depending on the average number of actuations per year (nop).
Tab. 9: Safety data
MS6-SV-...-D
Certificates, declaration of conformity è www.festo.com/sp
Tab. 10: Product conformity