Festo VTSA Series, Manual

Page: 96 / 166

4. Commissioning
4−4
Festo P.BE−VTSA−44−EN en 0601a
4.1 General instructions
4.1.1 Before commissioning
·
Switch off the power supply before connecting or discon
necting plugs (otherwise this could lead to functional
damage).
·
Commission only a valve terminal which has been fitted
and wired completely.
·
Make sure that there is a sufficient supply of fresh air
(cooling) for the following operating conditions:
when the maximum number of valves are fitted
when the maximum operating voltage is applied
when the solenoid coil is constantly under stress.
·
Please observe the following instructions on building up
pressure in the complete supply.
4.1.2 Pressure increase in the complete supply
Warning
If the build up of pilot air is too slow or delayed, this may
lead to sudden unexpected movements of the actuators
under the following conditions:
Switch on the compressed air via a start−up valve for
delayed build−up of pressure and
if there are electric signals (e.g. after EMERGENCY
STOP).
This can cause damage to the machine or system and even
injury to human beings.
·
Operate the valve terminal with external pilot air
corresponding to the pressure specified in appendix A,
Tab.A/4. The pilot air must be branched in front of the
start−up valve for delayed build−up of
pressure (see fig.).