Festo Генераторы вакуума VN, пневматические - Handbuch (Seite 2)

Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Products under pressure can cause injury to human
beings and damage to property.
• Before carrying out installation and maintenance
work always switch off the compressed air supply.
• Use shut-off valves in the compressed air tubing for
exhausting the system.
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Depending on the functioning of the machine/system,
the manipulation of signal states can cause serious
injury to human beings and damage to property.
Please note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fitting and commissioning to be carried out only by
qualified personnel in accordance with the operating
instructions.
This product is designed to be operated with com-
pressed air only. The product is not suitable for use
with other media (liquids or gases).
Fig. 1
Fig. 2
2
3
1
max. 0.6 Nm
4
5
6
7
1 Application
The vacuum generator type VN-...-P is designed for gener-
ating vacuum. With the vacuum generated, a force is built
up via suction grippers with which work items can be
transported. The integrated vacuum switch monitors here
the vacuum generated and provides electric signals.
The vacuum switch closes (switch element function NO:
normally-open) a current circuit when the programmed
switching pressure is reached. The switching element
function is preset at the factory. The VN-...-P is available
with different switching functions.
Key features Type
(order code) Design
Vacuum suction
nozzle VN-...
Rated size of Laval
l
-05-... 0.45 mm
nozzle -07-... 0.7 mm
-10-... 0.95 mm
Vacuum type -H-... High vacuum/standard yp
-L-... High suction volume
current/standard
Housing type -T4-... T-form, housing width
16 mm
Compressed air
connection 1 -PQ2-... Plug connector QS6
Vacuum connection 2 -VQ2-... Plug connector QS6
Switching function -O1-... Threshold value with
fixed hysteresis, 2 teach
points, normally-open
contact
-O2-... Threshold value with
variable hysteresis,
normally-open contact
Electric output -P Switching output PNP
2 Safety conditions
Please note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Improper handling can result in malfunctions.
Make sure that the following specifications are always
observed.
• Compare the maximum values specified in these oper-
ating instructions with your actual application (e.g.
operating media, pressures, forces, torques, tempera-
tures, masses, speeds, operating voltages, flow rates).
• Please comply with national and local safety laws and
regulations.
• Take into consideration the ambient conditions at the
location of use.
• Unauthorised product modification is not permitted.
• Remove dirt particles in the supply lines by blowing out
the tubing with compressed air. In this way you will pro-
tect the VN-...-P from premature failure or heavy wear
(see DIN ISO 4414, section 9.4).
3 Installation
The valve terminal can be fitted in any position. Do not
mount with the Edit button facing downwards in order to
avoid condensation gathering in the sensor.
3.1 Mechanical installation
• Fasten the VN-...-P with two M3 screws
3 in the
intended position, tightening torque max. 0.6 Nm.
We recommend that suitable washers be used.
3.2 Pneumatic installation
• Connect the QS6 plug connections for compressed
air 1 and vacuum 2 of the VN-...-P with suitable tub-
ing. We recommend that tubing type PUN-6 be used.
3.3 Electrical installation
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use only power units 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/DIN EN 60204-1.
Please note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Long signal cables reduce the immunity to interference.
• Make sure that the signal cable is never longer than
30 m. In this way you can avoid non-operate currents
caused by electromagnetic interference.
Please note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
If there are electrostatic discharges on the device, the
digital switching output may in some cases be switched
for a brief period.
Circuit diagram
• Wire the electrical connection 5 of the VN-...-P as
follows:
Pin Assignment Cable colours 1) Plug 2)
1 + 24 V DC power supply brown (BN) M8 x 1, 3-pin
2/4 Output A (out A) black (BK)
3 0 V blue (BU)
1) Using the connector socket with cable as specified in the chapter
“Accessories”
2) Tightening torque max. 0.3 Nm
4 Commissioning
• Make sure that:
– nobody is standing in the positioning range of the
work item
– there are no objects in the path of the moveable mass
(e. g.: by means of a protective screen).
• Avoid long tubing and large volumes between the
suction grippers and the vacuum suction nozzle.
A large volume leads to long exhausting times and
possibly incorrect settings on the vacuum switch.
• Take into account accelerations, external influences,
etc. on the work item when setting the required holding
force.
Building up the vacuum:
• Pressurize the VN-...-P with an operating pressure at
pressure connection 1. A suitable vacuum will then be
generated at vacuum connection 2. The vacuum can
be set by modification to the operating pressure. The
work item must be held reliably against the suction
gripper by the vacuum generated.
Setting the vacum switch:
The setting of the vacuum switch for monitoring the
vacuum depends on the application.
• Switch on the operating voltage. The VN-...-P is in the
basic status.
Definition
Switching pressure SP Vacuum at which the VN-...-P switches
Teach pressure TP Vacuum at time of programming
Set the switching pressure in EDIT mode as follows:
1.Pressurize the VN-...-P with a teach pressure
(e. g.: TP1). The sequence of the teach pressures is not
important.
2.Press the Edit button 7 until the LED 6 begins to
flash.
When the button is released, the VN-...-P saves the first
teach pressure. The LED then continues to flash.
3.Pressurize the VN-...-P with the other teach pressure
(e.g.: TP2).
4.Press the Edit button 7 until the LED 6 ceases to
flash.
When the button is released, the VN-...-P saves the
second teach pressure and concudes the EDIT mode.
The relationship between teach pressure, switching
pressure and hysteresis is shown in the following table.
With the VN-...-O1-P the switching pressure is formed
from the average value of both teach pressures
(SP = 1/2 (TP1 + TP2)). With the VN-...-O2-P the higher
teach pressure becomes the switching pressure.
• Carry out a test run with various pressures to ascertain
whether the VN-...-P switches as desired.
The LED
6 lights up parallel to the programmed
switching behaviour.
Type Switching function
VN-...-O1-P Threshold value
comparator with
fixed hysteresis,
normally-open
contact
p
1
0
OUT
SP TP1 TP2
Hy
VN-...-O2-P Threshold value
comparator with
fixed hysteresis,
normally-open
contact
p
Hy
SP=TP2 TP1
1
0
OUT
Building up the vacuum:
• Block the supply of compressed air at connection
1.
The vacuum connection 2 is exhausted via the silencer
4. The work item detaches itself from the suction
gripper.
5 Operation
Modifying the switching pressure, see chapter
“Commissioning”.
In the event of a power failure, the last setting of the
switching pressure will be saved.
6 Trouble-shooting
Fault Possible cause Remedy
No LED display Supply voltage not
applied or no permitted
operating voltage Switch on supply
voltage / maintain
permitted operating
voltage range
Connections swapped
(incorrect polarity) Wire the VN-...-P as
shown in the circuit
diagram.
Pressure failure Eliminate pressure
failure
VN-...-P operated with
non-permitted medium Replace the VN-...-P and
operate only with
compressed air
VN-...-P is defective Send VN-...-P to Festo
with description of fault
LED display or
switching output
d
i
Short circuit or
overload at the output Eliminate short
circuit/overload
switching output
does not react in
accordance with
the settings
made
Incorrect switching
point taught
(e.g. at 0 bar) Repeat the teach
procedure (see chapter
“Commissioning”)
made
VN-...-P is defective Send VN-...-P to Festo
with description of fault
7 Accessories
Designation Type
Plug socket with cable M8x1, 3-pin SIM-M8-3..D-...
8 Technical specifications
Type VN-... -O1-P -O2-P
Operating pressure [bar] 1 ... 8
Overload pressure at
vacuum connection [bar] ≤ 5
Operating medium Dried, filtered and
non-lubricated compressed air
Pressure measuring
range [bar] –1 ... 0
Accuracy [% FS] ±1.5
Threshold value setting
range [bar] –1 ... 0
(recommended working range:
–0.95 ... –0.05 % FS)
Hysteresis [% FS] 2 –
Setting range
Hysteresis [% FS] – 0 ... 100
(recommended
working range:
5 ... 95 % FS)
Temperature
coefficient of switching
point [% FS/K] ±0.05
Ambient temperature
Medium temperature [°C]
[°C] 0 ... +50
0 ... +60
Operating voltage
range [V DC] 15 ... 30
Idle current [mA] ≤ 30
Max. output current [mA] 100
Protective functions
– Inductive protective circuit
– Protection against short circuit
– Protection against overloading
Adapted to MZ, MY, ME coils
Pulsed
Exists
Protection class IP40
Interference emission
Interference immunity As per EN 61000-6-4 (industry)
As per EN 61000-6-2 (industry)
Resistance to vibration as per DIN/IEC 68/EN 60068 part 2-6:
0,35 mm path at 10 ... 60 Hz, 5 g acceleration at 60 ... 150 Hz
Resistance to shock as per DIN/IEC 68/EN 60068 part 2-27:
30 g acceleration at 11 ms duration (half-sine)
Vacuum generator
VN-...-P
Operating instructions
Original: de
Festo AG & Co. KG
P.O. Box
D-73726 Esslingen,
Germany
Tel.:
+49/711/347-0
www.festo.com
0507NH en 694 781