Festo CDVI-DN Series Electronic Manual page 36

1. Installation
1−24
Please note
Check your EMERGENCY STOP circuit, in order to ascertain
the measures necessary for switching your machine/sys
tem into a safe state in the event of an EMERGENCY STOP:
Switching off the load voltage for the valves and output
modules in the secondary circuit of the power 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 when
the load voltage is switched off.
Take this into consideration, e.g. as follows:
Registering that the load voltage has been switched off
by means of an input signal in the controller.
Blocking the control signal for the valves by locking the
output signal with the input signal Load voltage".
Potential equalization
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 base).
Please note
By means of low−impedance connections, make sure
·
that the housing of the valve terminal and the earth con
nection at pin 5 have the same potential and that there
are no equalizing currents.
In this way, you will avoid interference caused by electro
magnetic influences.
Festo P.BE−CDVI−DN−EN en 0404NH