6.4 Purging the vacuum:
OVEM−
Ū
−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).
è
The vacuum port
5
is supplied with air. The workpiece detaches itself from
the suction gripper.
OVEM−
Ū
−CE/−OE
When the solenoid valve for ejector pulse
1
is switched on, an ejector pulse is
generated.
è
The vacuum port
5
is supplied with air. The workpiece detaches itself from
the suction gripper.
Note
When large suction cups are used, flow resistance in the suction cup as the cup
lifts away from the workpiece can cause the buildup of a vacuum independent of
the generating device. This might mean that the workpiece being set down does
not detach from the suction cup, even when the ejector pulse is set to a long
duration.
Therefore, switch on the solenoid valve for ejector pulse
1
shortly before the
suction cup is lifted away, to ensure that the ejector pulse is active as the suction
cup lifts away.
7
Operation
Note
The settings last saved are retained in the event of a power failure.
7.1 Manual override
Fig.16 Operating the manual override
The manual override can be used to switch the solenoid valve manually when it is
not being actuated or not supplied with power. The manual override is non−detent
ing (automatic reset).
· Press down the plunger of the manual override with a blunt pin.
The solenoid valve is activated.
· Remove the pin.
The plunger of the manual override and the solenoid valve move to their normal
position.
7.2 Vacuum generator status display
LED
Status
Meaning
Out
Off
Switching point not reached
Lights up
Switching point reached
Flashing
Switching point being taught
Vacuum On/Off
CE/CN
Off
Solenoid valve for vacuum ON/OFF is not
switched, no vacuum generated
Lights up
Solenoid valve for vacuum ON/OFF is
switched, vacuum is generated
OE/ON
Off
Solenoid valve for vacuum ON/OFF is
switched, vacuum is generated
Lights up
Solenoid valve for vacuum ON/OFF is not
switched, no vacuum generated
Eject
Off
Solenoid valve for ejector pulse is not
switched, no ejector pulse generated
Lights up
Solenoid valve for ejector pulse is switched, an
ejector pulse is generated
Fig.17 Vacuum generator status display
8
Maintenance
· Switch off the following sources of energy before cleaning the exterior of the
device:
Operating voltage
Compressed air supply
· If necessary, clean the outside of the vacuum generator.
Permitted cleaning agents are soap suds (max. +60°C) and all non−abrasive
agents.
· Check whether the air filter is contaminated.
The filter can be inspected visually through the transparent filter cover.
Cleaning the air filter:
1
2
Fig.18 Removing/installing the filter
1. Vent the vacuum generator.
2. Carefully pull out the slide
1
on the filter
2
up to the first detent. The slide
1
must stay in this position on the filter.
3. Pull the filterout.
(Use a screwdriver to help to bring out the filter if necessary)
4. Clean the filter
2
, for example with cleaner’s solvent.
5. Push the filter
2
into its housing using the slide
1
.
6. Push in the slide
1
.
9
Eliminating malfunctions
Malfunction
Possible cause
Remedy
Workpiece does not de
tach from suction cup
A vacuum built up when lifting
large suction cups away quickly
Increase the intensity of the
ejector pulse
Lift the suction cup away from
the workpiece more slowly
Set the ejector pulse to be
active when lifting the suction
cup away
Tubing used between the suc
tion cup and vacuum generator
is wrongly sized (tube is too long
and/or tube internal diameter is
too small)
Replace the tubing; tubing
requirements
è
Flow control screw is closed
Open the flow control screw
No LED display for switch
ing inputs
Supply voltage not applied or no
permitted operating voltage
Switch on supply voltage/
maintain permitted operating
voltage range
Connections swapped (incorrect
polarity)
Wire the device as per the dia
gram
No control signal
Check the control system
Device defective
Replace the device
No LED display for switch
Pressure failure
Eliminate pressure failure
p y
ing output
Vacuum generator operated with
non−permitted medium
Replace the vacuum generator
and operate only with com
pressed air
LED display or switching
output does not react in
Short circuit or overload at the
output
Eliminate short circuit/overload
output does not react in
accordance with the set
tings made
Incorrect switching point taught
(e.g. at 0 bar)
Repeat Teach procedure
(
è
Device defective
Replace the device
Fig.19 Eliminating malfunctions
10
Disassembly
1. Switch off the following sources of energy before disassembling:
Operating voltage
Compressed air supply
2. Disconnect the electrical and pneumatic connections to the vacuum generator.
3. Remove the vacuum generator.
