Festo VPPM Serie Instrucciones De Utilizacion página 39

VPPM−...
Fault
VPPM−...
does not react
Flow rate too low
Pressure rises too
slowly
Pressure constant
despite modified
setpoint
specification
Manual selection
of the parameter
sets using the
UP/DOWN buttons
on the VPPM−...
not possible
Fig. 22
Festo VPPM−... 0607NH English
Possible cause
No power supply, POWER LED
does not light up.
No setpoint voltage or setpoint
current.
VPPM−... defective.
Restricted cross section of flow
due to connection technology
(swivel fittings).
Large cylinder volume and long
tube length
Fracture of the supply cable
(The output pressure last set
is maintained but without
closed−loop control. The
pressure at the output can
increase or decrease over
the medium term.)
Supply pressure P1 too low
Voltage is applied to the
digital inputs D1 and D2.
Remedy
Check the connection of
the 24 VDC power supply.
Check controller, check
connection.
Send in the device to the Festo
repair service.
Use connection alternatives.
Select different parameter
set
Use VPPM−... with larger
nominal size
Replace supply cable
Increase supply pressure
Apply 0 V DC to digital inputs
D1 and D2.
39