Festo OVEM-...-1N, OVEM-... -05...-BN, OVEM-... -05...-B, OVEM-... -07...-BN, OVEM-... -07...-B Instructions And Operating

OVEM-...-1P/1N

Vacuum generator

Festo AG & Co. KG
Ruiter Straße 82
73734 Esslingen
Germany
[phone]

www.festo.com

Instructions | Operating

8109422
2019-03c
[8109424]

Translation of the original instructions

1 Applicable documents

All available documents for the product èwww.festo.com/pk.

Document Product Contents

Instruction manual Manifold rail OABM-P Assembly

Tab. 1 Applicable documents

2 Safety

2.1 Safety instructions

– The product may only be used in its original status without unauthorised

modifications.
– Only use the product if it is in perfect technical condition.
– Use the product only inside buildings.
– Take into consideration the ambient conditions at the location of use.
– The product is intended for use in industrial environments. This product can

generate high frequency malfunctions, which may make it necessary to imple-

ment interference suppression measures in residential areas.
– Observe the specifications on the product labelling.
– Comply with all applicable national and international regulations.
– Observe the local regulations for environmentally friendly disposal.

2.2 Intended use

The intended use of the product is to generate a vacuum.

2.3 UL certification

In combination with the UL inspection mark on the product, the information in this
section must also be observed in order to comply with the certification conditions
of Underwriters Laboratories Inc. (UL) for USA and Canada.

UL approval information

Product category code QUYX (USA)

File number E322346

Standards taken into account UL 61010-1

UL symbol

QUYX7 (Canada)

C22.2 No. 61010-1

Tab. 2 Approval information
The unit shall be supplied by a power source which fulfils the requirements on a

limited-energy circuit in accordance to IEC/EN/UL/CSA 61010-1 or on a Limited
Power Source (LPS) in accordance to IEC/EN/UL/CSA 60950-1 or IEC/EN/UL/CSA
62368-1 or a Class 2 circuit in accordance to NEC or CEC.

3 Service

Contact your regional Festo contact person if you have technical questions
èwww.festo.com.

8109422

4 Product design

Solenoid valve for ejector pulse

1

(eject)
Solenoid valve for vacuum

2

Mechanical manual override

3

Supply port (1)

4

Exhaust port/silencer (3)

5

Vacuum port (2)

6

Housing with mounting hole

7

Slide for changing the filter ele-

8

ment

Filter housing with display window

9

Flow control screw for adjusting

10

the ejector pulse
EDIT button

11

LED for switching output – Out

12

LED for switching input – vacuum

13

ON/OFF
LED for switching input – ejector

14

pulse (eject)
Electrical connection

15

Size OVEM-...-20/-30-C

16

Fig. 1 Operating elements and connections

LED and EDIT button not present on models without vacuum sensor

Filter housing with display window only on OVEM-...-B

4.1 Product variants

Product variant Code Meaning

Vacuum generator OVEM Vacuum generator with vacuum solenoid valve ON/OFF

Nominal width laval nozzle

Housing size / width

Pneumatic connections

-05 0.45mm

-07 0.7mm

-10 0.95mm

-14 1.4mm

-20 2.0mm

-30 3.0mm

-H high negative pressureVacuum type

-L high suction volume

-B 20 mm wide, ISO standard

-BN 20 mm wide, NPT

-C 36 mm wide, ISO standard

-QO

-GO

-PL

and electric manual override

all ports with QS push-in fittings (-B-QS/-C-QS)-QS

all ports with QS push-in fittings inch (-BN-QS)

Supply / vacuum port with QS push-in fittings, exhaust
port with open silencer (-B-QO/-C-QO)

Supply / vacuum port with QS push-in fittings inch,
exhaust port with open silencer (-BN-QO)

all ports with G female thread (-B-GN/-C-GN)-GN

all ports with NPT female thread (-BN-GN)

Supply / vacuum port with G female thread, exhaust
port with open silencer (-B-GO/-C-GO)

Supply / vacuum port with NPT female thread, exhaust
port with open silencer (-BN-GO)

prepared for common supply manifold, vacuum and
exhaust port with QS push-in fittings (-B-PL/-C-PL)

prepared for common supply manifold, vacuum and
exhaust port with QS push-in fittings inch (-BN-PL)

Product variant Code Meaning

Pneumatic connections -PO

Normal position of the
vacuum generator

Electrical connection -N M12 plug (5-pin)

Vacuum sensor

Alternative vacuum display

-ON NO, normally open (vacuum generation)

-OE NO, normally open (vacuum generation) with ejector

-CN NC, normally closed (no vacuum generation)

-CE NC, normally closed (no vacuum generation) with eject-

-1PD 1 switching output PNP, 2 switching inputs PNP, with

-2P 2 switching outputs PNP

-2N 2 switching outputs NPN

-PU 1 switching output PNP, 1 analogue output 0…10V

-PI 1 switching output PNP, 1 analogue output 4…20mA

- bar (-B), InHg (-BN)

-B bar

-W InH20

-H InHg

prepared for common supply manifold, vacuum port
with QS push-in fittings, exhaust port with open silencer
(-B-PO/-C-PO)

prepared for common supply manifold, vacuum port
with QS push-in fittings inch, exhaust port with open
silencer (-BN-PO)

pulse

or pulse

display

Tab. 3 Overview of variants

5 Fast commissioning with factory settings

The vacuum generator is supplied with the following factory settings:
– Switching characteristics of the electrical output: threshold value comparator
– Switching element function of the electrical output: NO (normally open)
– Switching point (SP): -0.4bar
– Fixed hysteresis (HYS): 20mbar

1. Mount the vacuum generator è 7 Assembly.

2. Connect the pneumatics for the vacuum generator

è 8.1 Pneumatic installation.

3. Connect the electrics for the vacuum generator è 8.2 Electrical installation.

The vacuum generator can be commissioned.

Ä

It is possible to teach a switching point so as not to use factory settings
è 9.2 Setting the vacuum sensor.

Fig. 2 Switching characteristics of switching inputs

Code Switching output Switching inputs

-1P Switching output

-1N Switching output

Positive switching

Negative switching

Switching inputs
Positive switching

Switching inputs
Negative switching

Tab. 4 Switching output and switching input variants

6.2 Switching point and hysteresis

Threshold value comparator

NO (normally open contact)

The factory settings cannot be restored.

6 Function and application

The vacuum generator is available with a range of pneumatic and electrical
switching functions.
The taught setpoint value for the generated vacuum is monitored via an integ­rated vacuum sensor (-1P, -1N). If the setpoint value is reached or if it is not
reached due to malfunctions (e.g. leakage, dropped workpiece), the vacuum
sensor emits an electrical signal and the Out LED indicates whether or not the
taught setpoint was reached.
The supply of compressed air for vacuum generation is controlled by an integ­rated solenoid valve. The solenoid valve is available in two different switching
functions, NC/NO. The vacuum is generated as soon as compressed air is applied
to the vacuum generator and the voltage is switched on (NC: -CE, -CN) or off (NO: ­OE, -ON) as defined by the switching function of the solenoid valve 2.
The integrated solenoid valve 1 can be used to control and generate an ejector
pulse to release the workpiece safely from the suction cup and to purge the vacu­um rapidly.

6.1 Switching output and switching inputs

The vacuum is monitored with the aid of a piezo-resistive sensor element. The
vacuum sensor converts pneumatic pressure values to provide electrical signals.
When the taught switching point is reached, the vacuum sensor closes a circuit
and provides an electrical signal. This signal can be used for open- or closed-loop
control functions.
The vacuum generator can be connected to higher-order systems by means of a
switching output (-1P, -1N) and switching inputs. The switching output is con­figured as a normally open contact. The output’s switching function is defined as
a threshold value comparator.
The solenoid valves for control of the compressed air and ejector pulse are actu­ated as defined by the input signals.

Tab. 5 Settings for switching points SP, hysteresis Hy and functional reserve FR

The switching point is determined from the teach pressure and the functional
reserve. A functional reserve (35% of the teach pressure) is deducted from the
teach pressure (SP = TP – 0.35*TP). For example,with a teach pressure of
–0.5bar, a switching point of –0.33bar is set. The hysteresis has a fixed value.

7 Assembly

An unfavourable mounting position can impair the function of the product.

• Install the vacuum generator so condensation from the compressed air lines
cannot accumulate in the device.

• Install the vacuum generator so that it cannot be heated above the maximum
permissible operating temperature (plan for possible convection).

• Install the vacuum generator so that the exhaust can flow without hindrance.

Direct mounting

Fig. 3 Direct mounting on the side

Variant Screws Tightening torque

OVEM-...-05/-07/-10-...-B M5 max. 2.5Nm

OVEM-...-14/-20-...-B M4 max. 2.5Nm

OVEM-...-20/-30-...-C M6 max. 2.5Nm

Tab. 6 Size and tightening torque of the screws for direct mounting on the side

OVEM-...-C: Mounting is possible on a common supply manifold with a maximum
of 4 places.
Assembly instructions for common supply manifold OABM-P
è 1 Applicable documents.

8 Installation

8.1 Pneumatic installation

Fig. 4 Direct mounting on the back

Variant Screw Tightening torque

OVEM-...-05/-07/-10/-14/-20-...-B/-BN M3 max. 0.8Nm

OVEM-...-20/-30-...-C M4 max. 0.8Nm

Tab. 7 Size and tightening torque of the screws with direct mounting on the back

H-rail mounting

Type of mounting permissible only for sizes OVEM-...-B/-BN

H-rail mounting accessories èwww.festo.com/catalogue

OVEM-... -05-...-GN-07-...-GN-10-...-GN-14-...-GN-20-...-GN-30-...-

GN

-05-...-GO-07-...-GO-10-...-GO-14-...-GO-20-...-GO-30-...­GO

<

Tube length [m]

Min. internal diameter of tubing [mm]

- Supply port 1 2 1.5 2 2 3 3 4 4 5 6 7

- Vacuum port 2 3 3 4 4 5 5.5 6 6 7 9 11

- Exhaust port 2 3 3 4 4 5 5.5 6 6 7 9 11

0.5

< 2 <

0.5

< 2 <

0.5

< 2 <

0.5

< 2 <

0.5

< 2 <

0.5

< 2

Tab. 9 Minimum inside diameter of the connection tubes for connections with G­female thread

Notes on the pneumatic connection

– Maximum permissible tube length 2 m
– OVEM-...-GN/-GO: minimum inside diameter of the connection tubes

è Minimum inside diameter of the connection tubes for connections with G-

female thread.
– Do not seal exhaust port.
– OVEM-...-07/-10/-14/-20/-30: If necessary, lengthen silencers with a silencer

extension èwww.festo.com/catalogue.
– Recommendation: Use type PUN tubes èwww.festo.com/catalogue.

8.2 Electrical installation

WARNING!

Risk of injury due to electric shock.

• For the electrical power supply, use only PELV circuits in accordance with IEC

60204-1/EN 60204-1 (Protective Extra-Low Voltage, PELV).

• Observe the general requirements of IEC 60204-1/EN60204-1 for PELV cir-

cuits.

• Only use voltage sources that ensure a reliable electric separation from the

mains network in accordance with IEC 60204-1/EN 60204-1.

H-rail mounting

1

2

Screw

Fig. 5 H-rail mounting

1. Mount mounting plate on H-rail mounting 1.

2. Hang OVEM with H-rail mounting in the H-rail and press in the direction of the
arrow.

3. Secure to the H-rail with screw 2.

Mounting via mounting bracket

Type of mounting permissible only for sizes OVEM-...-05/-07/-10/-14/-20-...-B/BN

Accessories for mounting bracket èwww.festo.com/catalogue

Fig. 6 Mounting with mounting bracket

Variant Screws Tightening torque

OVEM-...-05/-07/-10-...-B/BN M5 max. 2.5Nm

OVEM-...-14/-20-...-B/BN M4 max. 2.5Nm

Tab. 8 Size and tightening torque of the screws for mounting with mounting
bracket

– Mount vacuum generator at the intended position using two screws (screw

size )
We recommend using corresponding washers.

Mounting on common supply manifold

OVEM-...-B: Mounting is possible on a common supply manifold with a maximum
of 8 places.

Long signal lines reduce the immunity to interference.

Signal lines £ 30

•

– Ensure operating supply voltage of 24VDC±15%.

The solenoid coils and electrical components may be damaged if the permit­ted switching voltage is exceeded.

– Connect the cable socket to the plug aE.
– Wire up the vacuum generator è Pin allocation.

Plug
M12x1,
5-pin

1) Tightening torque max. 0.3Nm

2) When using the plug socket with cable as per Accessories

3) Pin 4 not assigned for types without vacuum sensor

Pin Wire

1)

colour

1 Brown (BN) +24V

2 White (WH) Switching input for vacuum ON/OFF

3 Blue (BU) 0V

4 Black (BK) Switching output (Out)

5 Grey (GY) Switching input for ejector pulse ON/OFF

Function

2)

3)

Tab. 10 Pin allocation

Circuit diagrams

OVEM-...-1P

Circuit diagrams

OVEM-...-1N

When using large suction cups, on lifting the suction cup from the workpiece the
flow resistance in the cup can result in a build-up of a device-independent vacu­um. This may result in the workpiece not being released from the suction cup,
even if the ejector pulse is set to a sufficiently long duration.
The solenoid valve for ejector pulse 1 should therefore only be switched on
shortly before the suction cup is lifted away, to ensure that the ejector pulse is
active during lifting of the suction cup.

OVEM without vacuum sensor

Tab. 11

9 Commissioning

– Observe the transport area of the workpiece and make sure that:

– Nobody is positioned underneath the workpiece
– There are no foreign objects (e.g. by means of a protective screen).

– Avoid long tubing lines and large volumes between the suction gripper and

the vacuum generator. A large volume leads to long evacuation times and
possibly incorrect settings on the vacuum sensor.

– Take into account accelerations, external influences, etc. on the workpiece

when setting the required holding force.

Unintentional pressing of the EDIT button (for longer than 2seconds) may cause a
modification of the preset switching pressure.

• Make sure that the Edit button is only pressed intentionally. Otherwise a
switching pressure of 0bar would be set if there was no operating pressure,
for example.

To prevent damage to the EDIT button, always use a blunt object to actuate the
EDIT button.

9.1 Building up the vacuum

1. Pressurise the vacuum generator with an operating pressure at the supply
port 4.

2. Switch on the operating voltage.

3. Energise the switching input for vacuum ON/OFF.

The solenoid valve 2 (-CN, -CE) is opened (or closed in the case of -OE, -

Ä

ON). The compressed air flows through the vacuum generator and gener­ates a corresponding vacuum at the vacuum port 5. The vacuum can be
set by changing the operating pressure.

9.2 Setting the vacuum sensor

The vacuum sensor setting for monitoring the vacuum depends on the applica­tion. The vacuum generator is preset at the factory
(è 5 Fast commissioning with factory settings). These settings can be quickly
adapted to the application by teaching a switching point.

1. Switch on the operating voltage.

2. Set the desired teach pressure (e.g. object gripped).
Hold down the EDIT button aA for >2s.

3.

The LED Out aB flashes.

Ä

4. Release the EDIT button aA.

The current teach point (TP) minus the functional reserve is saved as the

Ä

switching point (SP) and is applied for the switching output.

5. Carry out a test run, varying the pressure to check whether the vacuum
generator’s switching output switches as desired.

9.3 Setting the ejector pulse (-OE, -CE)

The intensity of the ejector pulse can be adjusted. You can set the intensity of the
ejector pulse by adjusting the flow control screwaJ.

1. Screw the flow control screw aJ in completely in a clockwise direction.

The ejector pulse channel is now closed. No ejector pulse is generated.

Ä

2. Unscrew the flow control screw until the required intensity of the ejector
pulse is reached.

3. Test the settings of the ejector pulse before commissioning.

9.4 Reducing the vacuum

OVEM-...-CN/-ON

• Cut off the compressed air supply by switching the input voltage off (in the
case of -CN) or on (in the case of -ON).

The vacuum port5 is pressurised. The workpiece detaches itself from

Ä

the suction gripper.

OVEM-...-CE/-OE

• Switching on the solenoid valve for ejector pulse1 generates an ejector
pulse.

The vacuum port5 is pressurised. The workpiece detaches itself from

Ä

the suction gripper.

10 Operation and use

The last saved settings are retained in the event of a power failure.

10.1 Mechanical manual override

Both solenoid valves can be manually switched with the manual override.

Fig. 7

1. Press in the plunger of the manual override with a blunt pin.
The solenoid valve switches.

Ä

2. Remove pin.
The plunger of the manual override is automatically reset. The solenoid

Ä

valve returns to the initial position.

10.2 Vacuum generator status display

LED Status Meaning

Out

Vacuum
ON/OFF

Eject

CE/CN

OE/ON

Off Switching point not reached

Lit Switching point is reached

Flashing Teach procedure is started

Off Solenoid valve for vacuum ON/OFF is not

Lit Solenoid valve for vacuum ON/OFF is

Off Solenoid valve for vacuum ON/OFF is not

Lit Solenoid valve for vacuum ON/OFF is

Off Solenoid valve for ejector pulse is not

Lit Solenoid valve for ejector pulse is

switched, no vacuum is generated

switched, vacuum is generated

switched, vacuum is generated

switched, no vacuum is generated

switched, no ejector pulse is generated

switched, an ejector pulse is generated

Tab. 12 Vacuum generator status display

11 Maintenance and care
Clean device

1. Switch off energy sources:

– Operating voltage
– Compressed air

2. Clean device with non-abrasive cleaning agents.

3. Check air filter through the display window for dirt.

Replace air filter

The air filter cannot be replaced in the vacuum generator OVEM-...-20/-30-C

Gate valve

1

Filter

2

Fig. 8 Remove/install air filter

1. Exhaust the vacuum generator.

2. Carefully pull gate valve 1 out to the first detent. The gate valve must stay in

this position on the filter.

3. Pull filter 2 out. Clean with white spirit.

4. Push filter into the housing.

5. Push in gate valve.
The gate valve pushes the filter into the vacuum generator.

Ä

12 Fault clearance

Malfunction Possible cause Remedy

Workpiece not released from suc­tion gripper

tion cup

No LED display for switching inputs

No LED display for switching output

LED display or switching output
does not react in accordance with
the settings made

A vacuum has built up when lifting
large suction cups quickly

Tubing used between the suction
cup and vacuum generator is
wrongly sized (tubing is too long
and/or tubing internal diameter is
too small)

Flow control screw is closed Open the flow control

Operating voltage faulty Switch on supply

Connections are swapped (reverse
polarity)

No control signal Check controller

Device faulty Replace device

Pressure failure Eliminate pressure fail-

Vacuum generator operated with
impermissible medium

Short circuit or overload at the out­put

Incorrect switching point taught
(e.g. at 0 bar)

Device faulty Replace device

Increase the intensity
of the ejector pulse

Lift the suction cup
more slowly from the
workpiece

Set the ejector pulse to
active when lifting the
suction cup

Replace tubingWorkpiece not released from suc-

screw

voltage/maintain per­mitted operating
voltage range

Wire the device in
accordance with the
circuit diagram

ure

Replace the vacuum
generator and operate
only with compressed
air

Eliminate short cir­cuit/overload

Repeat teach proced­ure

Tab. 13 Fault clearance

13 Disassembly

1. Switch off energy sources:

– Operating voltage
– Compressed air

2. Disconnect pneumatic and electrical connections from the device.

3. Loosen mountings and remove device.

14 Technical data

OVEM-... -05 -07/-10 -14/-20--

B/-BN

Characteristic values

Operating pressure OVEM-...­QS/-GN/-PL

Operating pressure OVEM-...­QO/-GO/-PO

Pressure measuring range [bar] –1 … 0

Overload pressure at vacuum
port

Ready-state delay [ms]

Dead time (evacuation and
ejection)

Electronics

Nominal operating voltage [V DC] 24 ± 15 %

Max. output current (per
switching output)

Voltage drop (for all switch­ing outputs)

No-load supply current [mA]

Coil characteristics 24 V DC –
low current phase

Coil characteristics 24 V DC –
high current phase

Time until current reduction [ms] 80

Capacitive load maximum DC [mF]

Overload protection Present

Inductive protective circuit adapted to MZ, MY, ME coils

Insulation voltage [V] 50

Surge resistance [kV] 0.8

Max. current consumption

OVEM-...-2P/-2N [mA] 270

OVEM-...-PI/-PU/-NI/-NU [mA] 180

OVEM-...-1PD [mA] 170

Accuracy [% FS] ± 3

Hysteresis [% FS] ± 0.1

Short-circuit resistance Yes

Reverse polarity protection For all electrical connections

Environment

Ambient temperature [°C] 0 … 50

Temperature of medium [°C] 0 … 50

Contamination level 3

Operating medium Compressed air to ISO8573-1:2010 [7:4:4]

Note on the operating medi­um

Note on materials RoHS-compliant

Shock resistance (in accord­ance with
IEC60068/EN60068)

Vibration resistance (in
accordance with EN60068-2)

Protection class III

Degree of protection IP 65

Relative humidity [%] 5 … 85

Emitted interference According to EN61000-6-4

Immunity to interference According to EN61000-6-2

Maximum permissible signal
line length

Materials

Information on materials –
seals

Information on materials –
housing

Information on materials –
plug housing

1) Degree of protection has not been evaluated by UL

[bar] 2 … 6

[bar] 2 … 8

[bar]

[ms]

[mA] 100

[V] ≤ 1.5

[W] 0.3

[W] 2.55

[m] 20

£ 5

£ 500

< 10 £ 20 £ 35 £ 60

< 70

£ 100

Lubricated operation not possible

30g acceleration with 11ms duration (half-sine)

10…60 Hz: 0.35 mm /
60…150 Hz: 5g

NBR HNBR

Die-cast aluminium, PA reinforced Wrought

Nickel-plated brass

1)

Tab. 14 Technical data

-20/-30-­C

aluminium
alloy

OVEM-... -05 -07/-10 -14/-20--

B/-BN

General

CE marking
(Declaration of conformity
èwww.festo.com/sp)

In accordance with EU EMC Directive

c UL us - Listed (OL)Approvals

RCM Mark

-20/-30-­C

15 Circuit symbols

OVEM-... Symbol

with vacuum sensor
(-1P/-1N)

-QO/-GO-CN-...

-QS/-GN-CN-...

-QO/-GO-ON-...

-QS/-GN-ON-...

-QO/-GO-CE-...

Without vacuum sensor

-QS/-GN-CE-...

-QO/-GO-OE-…

-QS/-GN-OE-...

Tab. 15 Circuit symbols for the functions