6.2 Pneumatic (in-line valve)
Valves for standard operation (gauge pressure)
1. Connect the following pneumatic ports with tubing (
è
– Compressed air port (1), Pos.
4
– Air port (2), Pos.
3
2. Mount a silencer Pos.
5
at the exhaust port (3) or remove the exhaust air with
ducts.
Valve for vacuum operation (reversible operation, type VEAB-...-D14...)
1. Connect the following pneumatic ports with tubing (
è
– Vacuum port (3), Pos.
5
– Air port (2), Pos.
3
2. At the compressed air port (1), Pos.
4
, mount the silencer to protect the valve
against coarse dirt particles.
Operating medium
Note
Lubricated compressed air results in malfunctions and damage to the valve.
Operate the valve only with unlubricated compressed air.
Observe the requirements on compressed air quality (
è
6.3 Electric
Warning
Electric voltage
Injury caused by electric shock, damage to machine and system
For the electrical power supply, use only PELV circuits in accordance with
IEC60204-1/EN 60204-1.
Use only voltage sources that ensure a reliable electric separation from the
mains network in accordance with IEC60204-1/EN60204-1.
Observe the requirements of IEC 60204-1/EN 60204-1 for PELV circuits.
Note
Long signal lines reduce interference immunity.
Signal lines must be shorter than 30 m.
If a screened cable is used, earth the insulation at the cable end farther away
from the valve.
1. Install electrical connecting cable without squeezing, buckling or stretching.
2. Screw electrical connecting cable onto the M8 plug connector (
è
– Tightening torque maximum 1.2 Nm.
Plug M8, 4-pin
Plug pattern
Pin
Allocation
1
+ 24V DC
2
+ Setpoint value
3
GND
4
+ Actual value
Fig. 5
7
Commissioning
Note
Keep the valve away from high-frequency radiation (e.g., from radio sets,
mobile telephones or other interference-emitting devices). In this way,
increased tolerances of the outlet pressure are prevented.
The valve interprets setpoint signals under 0.5% of the upper setpoint value as
0 V and/or 4 mA. In this case, the outlet pressure is set to the ambient pressure.
1. Check operating conditions and limit values (
è
2. Switch on compressed air supply.
3. Check pneumatic connection points for tightness.
4. Connect the valve to a setpoint signal.
5. Switch on the operating voltage (Pin 1).
Note
When decommissioning the valve, switch off the setpoint voltage first, then
the operating voltage and finally the compressed air supply.
8
Maintenance and care
Warning
Risk of injury
Accidental movements of the connected actuator technology and uncontrolled
movements of loose tubing can cause injury to people or material damage.
Before all maintenance work, depressurize the valve and pneumatic
connecting lines.
1. Switch off the following energy sources to clean the outside:
– compressed air
– operating voltage
2. Clean the outside of the valve with a soft cloth. Do not use aggressive cleaning
agents.
9
Disassembly
Warning
Risk of injury
Accidental movements of the connected actuator technology and uncontrolled
movements of loose tubing can cause injury to people or material damage.
Before disassembly, depressurize the valve and pneumatic connecting lines.
1. Depressurize the valve and pneumatic connecting lines.
2. Switch off the operating voltage.
3. Remove electrical connecting cable.
4. Remove compressed air lines.
5. Disassemble the valve (
è
Assembly instructions).
10
Accessories
è
www.festo.com/catalogue
11
Diagnostics
1
1
“Power” LED
Fig. 6
“Power” LED
LED
display
Status and significance
LED illuminated green:
– The operating voltage is present and within the permissible range.
– The setpoint signal lies in the permissible range
(0 … 10.8V and/or 2.5 … 20.5mA).
– No error
LED flashing red:
– The operating voltage lies above the permissible range (>29V).
LED flashes alternately red and green:
– The setpoint signal lies above the permissible range (>10.8V and/or >20.5mA).
– The setpoint signal lies below the permissible range (<2.5mA).
LED is off:
The operating voltage does not lie at or below the permissible range (<19V).
Fig. 7
