Festo CDVI-DN Series Electronic Manual page 35

1. Installation
Festo P.BE−CDVI−DN−EN en 0404NH
Warning
If the valve terminal is supplied with load voltage via an
output of a safety I/O module", switch−on test pulses of
the safety I/O module" may lead to unexpected reactions
of the valve terminal.
Make sure that switch−on test pulses are reliably sup
·
pressed or switched off.
Observe the following with the connection for the 24 V load
voltage (pin 2):
Observe the tolerance (21.6 ... 26.4 V DC).
·
Check the 24 V load voltage of the valves while the
system is operating.
Caution
Excessive voltages or short circuits can lead to functional
damage on the CP..−SC−DN, whereby actuators can no
longer be controlled.
Protect the load voltage of the valve coils with external
·
fuses.
In order to ascertain the size of the fuses, calculate first
the maximum current consumption in accordance with
section 1.4.1.
1−23