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Parker Hannifin Corporation
Proportional DC Valves
Series D*FC, D*1FC
Operation Manual
D_FC 5715-686 UK 07.02.2019
Incorrect signal amplitude levels may disturb
the functionality and can damage the valve.
The option 4...20 mA uses the “0 mA“ condi-
tion as breakdown-information. This means
the presence of an evaluable failure informa-
tion if the input signal line is interrupted. In
this case the actuator drive will be switched
off. The drive will switch on when the input
signal reaches a value of 3.8 mA, it switches
off when the command falls below 3.6 mA.
This determination follows the NAMUR-
specification NE43.
NAMUR is an association of users of process
control technology.
Command signal input
The command signal for the valve will be connected
to the pins D and E of the difference signal input
of the electronic driver. The spool stroke behaves
proportional to the command signal amplitude.
Different versions of command signal processing
are available, depending on the valve type. These
are described below:
For the function description is assumed as signal
reference (0V):
Code 0: pin E, Code 7: pin E, Code 5: pin 5
Details are shown from the technical specifi-
cations.
The command input signal needs to be filtered
as well as free of inductive surges and
modulations. Due to the sensitivity of the valve
a high signal quality is recommended, this
will prevent malfunction.
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