Pressure Build-Up Function; Required Sensors; Diagnostic Messages And Error Elimination; System Parameters Used - Festo VTEM Description

2 Function
2.1.3

Pressure build-up function

When a pneumatic drive hits a chamber that is pressurised with only low pressure (e.g. ambient pressure),
an unexpectedly fast travel speed of the drive can result.
The pressure buildup function avoids this behaviour by checking the pressure in the corresponding chambers.
If the pressure is too low, the chamber is actively pressurised before a travel command is carried out.
Under certain parameters (position of the drive piston, surface area of the drive, etc.), the pressure
buildup function can result in unexpected movements of the drive:
– delayed start of movement
– initially slow movement in the direction of actuation or movement against the direction of actuation
The pressure buildup function (if not deactivated by the user) is normally active only in case of error and
has no effect on normal operation.
2.2

Required sensors

The Motion app does not require any external sensors.
2.3

Diagnostic messages and error elimination

For information on VTEM diagnostic messages and error elimination è Description of function and
parameterisation for Motion Terminal VTEM
2.4

System parameters used

None
2.5

Application parameters used

2.5.1 Pressure buildup function
Note
If the pressure buildup function is deactivated, very fast movements of the drive can result (conditions
è Section 2.1.3).
ID Status of the function
222 Active
Inactive
Tab. 2.4
2.6

Default values

The structure of the process data is described in the description "Function and parameterisation
of Motion Terminal VTEM".
2.6.1

Setting of the Motion app (app option)

Not used.
6
Value of the parameter
1
0
Festo – VTEM-MA05-EN – 2017-12 – English