Type
OVEM−05
GN/GO
OVEM−07
GN/GO
OVEM−10
GN/GO
OVEM−14
GN/GO
Tube length
< 0.5m < 2m
< 0.5m < 2m
< 0.5m < 2m
< 0.5m < 2m
Minimum tube internal diameter [mm]
Port1
Compressed air
1
2
1.5
2
2
3
3
4
Port2
Vacuum
2
3
3
4
4
5
5.5
6
Port3
Exhaust
2
3
3
4
4
5
5.5
6
Fig.12 Minimum tube internal diameters
· With OVEM−07/10/14, you can extend the silencer if needed using a silencer
extension (
è
4.3 Electrical
Warning
Use only power sources which guarantee reliable electrical isolation of the
operating voltage as per IEC/DIN EN 60204−1. Observe also the general
requirements for PELV power circuits as per IEC/DINEN60204−1.
Note
Long signal lines reduce the resistance to interference.
· Make sure that the signal cables are not longer than 30m.
· Make sure that the operating voltage supply is 24 VDC ±15 %.
The solenoid coils and electrical components could be damaged if the maximum
permitted switching voltage is exceeded.
· Connect the cable socket to the plug connector
aE
.
· Wire the vacuum generator as shown in Fig.13.
Plug connector
2)
5−pin M12
Pin
Wire colours
1)
Allocation
1
1
Brown (BN)
Supply voltage +24VDC
1
2
White (WH)
Switching input for vacuum ON/OFF
2
4
3
Blue (BU)
0 V
2
4
4
Black (BK)
Switching output (Out)
3)
5
3
5
Grey (GY)
Switching input for ejector pulse
ON/OFF
3
1)
Using the plug socket with cable as specified in the chapter Accessories".
2)
Max. tightening torque 0.3Nm.
3)
Pin 4 is not connected on models without vacuum sensor
Fig.13 Pin allocation
Circuit diagrams for OVEM−...
OVEM−
Ū
−1P
OVEM−
Ū
−1N
OVEM without vacuum sensor
Fig.14 Circuit diagrams for vacuum generator
5
Fast commissioning with factory setting
The vacuum generator is available with the following factory settings:
· Switching characteristics of the electrical output: threshold value comparator
· Switching element function of the electrical output: NO (normally open con
tact)
Factory settings for OVEM−
Ū
Out
Switching point (SP)
0.4bar
(Fixed hysteresis (HYS)
20mbar)
Fig.15 Factory settings
If you do not wish to use the factory settings, you can teach a switching point for
the switching output (
è
chapter6Commissioning). The factory settings are not
reproducible.
6
Commissioning
· When transporting workpieces, make sure that:
Nobody is standing under the workpiece
There are no objects within the transporting path of the workpiece (e.g. by
means of a protective screen).
· Avoid long tubing and large volumes of air between the suction grippers 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.
Note
Unintentional pressing of the EDIT button (for longer than two 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.
Note
To prevent damage to the EDIT button, press the EDIT button with a blunt object
only.
6.1 Building up the vacuum:
1. Pressurise the vacuum generator with an operating pressure at the supply
port
3
.
2. Switch on the operating voltage.
3. Energise the switching input for vacuum ON/OFF.
è
The solenoid valve
2
(−CN, −CE) is opened (or closed in the case of −OE,
−ON). The compressed air flows through the vacuum generator and gener
ates a vacuum accordingly at the vacuum port
5
. The vacuum can be ad
justed by modifying the operating pressure.
6.2 Setting the vacuum sensor:
The setting of the vacuum sensor for monitoring the vacuum depends on the ap
plication.
The vacuum generator is preset at the factory (factory settings
è
chapter5 Fast
commissioning). These settings can be adapted to the application quickly by
teaching a switching point.
Teaching a switching point:
1. Switch on the operating voltage.
2. Set the desired Teach pressure (e.g. object gripped).
3. Press and hold the EDIT button
aA
>
2sec.
è
The LEDOut
aB
flashes.
4. Release the EDIT button
aA
.
è
The current Teach point (TP) minus the buffer is saved as the switching point
(SP) and is applied for the switching output.
5. Carry out a test run, varying the pressure to check whether the vacuum gener
ator’s switching output switches as desired.
6.3 Setting the ejector pulse (−OE, −CE):
The vacuum generator must be in its initial position.
The workpiece must be held securely against the suction gripper by the vacuum
generated.
The intensity of the ejector pulse can be set.
You can set the intensity of the ejector pulse by adjusting the flow control
screw
aJ
.
1. Screw the flow control screw
aJ
all the way in by turning it clockwise.
è
This closes off the channel for the ejector pulse. No ejector pulse is gener
ated.
2. Unscrew the flow control screw until the required ejector pulse intensity is
reached.
3. Test the settings for the ejector pulse prior to commissioning.
