Festo VZWM, Operating Instructions Manual

Page: 25 / 88

VZWM
Festo VZWM 0612NH English
25
11 Eli m in a tin g fau lt s
F au lt Po ss ible caus e Re m e d y
The VZWM
diaphragm
valve vibrates
or does not
switch Pressure difference
too low
S
Check the application parameters.
S
Make sure that the diference in pressure
between the input (connection P) and the
output (connection A) exists permanently.
switch
Exhaust hole in the
output covered
S
Remove the sealing material in front of the
exhaust hole.
The VZWM
diaphragm
valve does not Valve defective
S
Return the diaphragm valve to
FestoAG&Co.KG.
valve does not
switch
Solenoid coil
defective
S
Check that the solenoid coil is functioning
correctly and, if necessary, replace it.
Loud switch
ing noises High pressure shock
S
Select valves and tubng diameter not too
small.
S
Insert a bypass for switching steps.
S
Switch off the pump before interrupting the
flow.
S
Insert a piston valve with closing time
regulaton.
Fig.7
The diaphragm valve has been calibrated by the manufacturer by means of the
regulating screw
2
( è Fig.1). This setting should be undertaken only by qualified
Festo personnel.
S
Avoid modifications to this setting.
S
If necessary, contact FestoAG&Co.KG.