Festo CDVI-DN Manual page 38

1. Installation
1-26
Note
Check your EMERGENCY STOP concept to ascertain which
measures are necessary for your machine/system in order
to switch the system into a safe state in the event of
EMERGENCY STOP:
– Switching off the load voltage for the valves and output
modules in the secondary circuit of the power supply
unit
– Switching off the compressed air supply for the valve
terminal
Due to energy stored in the input circuitry of valve ter-
minals, there may be a delayed reaction of the valves
after switching off the load voltage.
Take this into consideration, for example as follows:
– By using an input signal in the controller to check
whether the load voltage has been switched off.
– By blocking the control signal for the valves by locking
the output signal with the "Load voltage" input signal.
Potential equalisation
Earth the CDVI valve terminal:
– At the power supply connection (pin 5).
– And on the housing (with cable lug on a spacer bolt on
conductive surface).
Note
By means of low-impedance connections, make sure the
•
housing of the valve terminal and the earth terminal at
pin 5 have the same potential and that there are no com-
pensating currents.
In this way, you will avoid interference from electromag-
netic sources.
Festo P.BE-CDVI-DN-EN en 0805a