Parker Series DFplus User manual

Bulletin HY11-5715-658/UK
Proportional Directional
Control Valve
Operation Manual
Series DFplus
Design > 20
Parker Hannifin
Manufacturing Germany GmbH & Co. KG
Hydraulic Controls Division Europe
Gutenbergstr. 38
41564 Kaarst, Germany
Tel.: [phone]
E-mail: [e-mail]
Copyright © 2013, Parker Hannifin Corp.

2
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Note
This document and other information from Parker-Hannifin Corpora-
tion, its subsidiaries and authorized distributors provide product or
system options for further investigation by users having technical
expertise.
The user, through its own analysis and testing, is solely responsible for
making the final selection of the system and components and assuring
that all performance, endurance, maintenance, safety and warning
requirements of the application are met. The user must analyze all
aspects of the application, follow applicable industry standards, and
follow the information concerning the product in the current product
catalog and in any other materials provided from Parker or its subsidi-
aries or authorized distributors.
To the extent that Parker or its subsidiaries or authorized distributors
provide component or system options based upon data or specifica-
tions provided by the user, the user is responsible for determining that
such data and specifications are suitable and sufficient for all applica-
tions and reasonably foreseeable uses of the components or systems.

Prop. Directional Control Valve
Series DFplusOperation Manual
3Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Inhalt
1. Introduction 4
D1FE 4
Ordering Code 4
D*FP 5
Ordering Code 5
D30FP 6
Ordering Code 6
Technical Data 7
Characteristics of Valve Driver 8
Name Plate 8
2. Safety Instructions 9
Symbols 9
Marking, Name Plates 9
Work at the Valve 9
3. Important Details 9
Intended Usage 9
Common Instructions 9
Liability 9
Storage 9
4. Mounting / Installation 10
Scope of Supply 10
Mounting 10
Operation Limits 10
Pressure Fluids 10
Electrical Connection 11
Electrical Interfacing 12
5. Operating Instructions 18
Zero Position Adjustment 18
Air Bleeding of Hydraulic System 19
Filter 19
Flushing 19
6. Maintenance 20
7. Trouble Shooting 20
8. Accessories / Spare Parts 21
Accessories 21
Spare Parts 21

4
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
1. Introduction
D1FE
Ordering Code
Nominal
size
NG06 /
CETOP 3
Direct.
control
valve
Spool-
type
(see
catalogue)
Command-
signal
Seal Design
series
(not re-
quired for
ordering)
Spool
position
on power
down
Con-
nection
Code Connection
0 6 + PE
5 11 + PE
76 + PE
+ Enable
Code Signal Flow direction
B +/- 10V 0...+10V -> P-A
E +/- 20mA 0...+20mA -> P-A
S 4...20mA 12...20mA -> P-A
D 1 F E C 9 3
Spool/
body
design
Code Seal
N NBR
V FPM
H for HFC fluid
Code Spool position on
power down
C

Prop. Directional Control Valve
Series DFplusOperation Manual
5Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Code Spool position on
power down Code Spool position on power down
AH
AB
PT
a0b
B J
AB
PT
a0b
C
D*FP
Ordering Code
Nominal
size
Direct.
control
valve
Spool-
type
(see
catalogue)
Command-
signal
Seal Design
series
(not
required for
ordering)
Spool
position
on power
down
Con-
nection
Code Nominal size
1 NG06 / CETOP 3
3 NG10 / CETOP 5
Code Connection
0 6 + PE
5 11 + PE
76 + PE
+ Enable
Code Signal Flow direction
B +/- 10V 0...+10V -> P-A
E +/- 20mA 0...+20mA -> P-A
S 4...20mA 12...20mA -> P-A
D F P 9 0
Spool/
sleeve
design
Code Seal
N NBR
V FPM
H for HFC fluid

6
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Code Spool position on
power down
A
B
C
D30FP
Ordering Code
Nominal
size
NG10 /
CETOP 5
Direct.
control
valve
Spool-
type
(see
catalogue)
Command-
signal
SealSpool
position
on power
down
Con-
nection
Code Signal Flow direction
B +/- 10V 0...+10V -> P-A
E +/- 20mA 0...+20mA -> P-A
S 4...20mA 12...20mA -> P-A
D 30 F P 3
Code Inlet Drain
1 1) internal external
4 internal internal
Pilot con-
nection
Design
series
(not re-
quired for
ordering)
1) for tank pressure >35bar
Spool/
body
design
Code Connection
0 6 + PE
5 11 + PE
76 + PE
+ Enable
Code Seal
N NBR
V FPM
H for HFC fluid

Prop. Directional Control Valve
Series DFplusOperation Manual
7Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Technical Data
General
Model Proportional directional control valve
Drive VCD(R)-actuator
Mounting Pattern NG6 (CETOP 3) / NG10 (CETOP 5)
Installation Position Any
Sensitivity [%] < 0.03
Hysteresis [%] < 0.05 (D1FE: <0.1)
Temp. Drift of Center Postion [%/K] < 0.025
Ambient Temperature Range [°C] -20...+50
Protection Class NEMA 4 (IP 65) acc. EN 60529
Vibration Strength [G] 10 Sinus 5...2000 Hz acc. IEC 68-2-6
30 Random noise 20...2000 Hz acc. IEC 68-2-36
15 Shock acc. IEC 68-2-27
Weight [kg] NG6: 5 / NG10: 6.8
Hydraulic
Fluid Rate Hydraulic oil acc. DIN 51524...535, other on request
Viscosity [SSU] 140...370
Fluid Temperature [°C] -20...+60
Cleanliness Purity level class acc. NAS 1638: class 7
Operating Pressure max. [bar] 350 for ports P, A, B / max. 35 for port T at internal drain,
250 at external drain / port Y max. 35 1)
Electrical
Duty Ratio [%] 100
Supply Voltage [VDC] 22...30, ripple < 5% eff., surge free
Current Consumption max. [A] 3.5
Pre-Fusing [A] 4.0 A medium lag
Command Signal Options [V]
[mA]
[mA]
+10...0...-10, ripple < 0.01 % eff., surge free, Ri = 100 kOhm
+20...0...-20, ripple < 0.01 % eff., surge free, Ri = 250 Ohm
4...12...20, ripple < 0.01 % eff., surge free, Ri = 250 Ohm
< 3.6 mA = enable off, > 3.8 mA = enable on acc. NAMUR NE43
Input Capacitance typ. [nF] 1
Differential Input Voltage max. [V] Code 0: 30 for terminal D and E against PE (terminal G)
11 for terminal D and E against 0V (terminal B)
Code 5: 30 for terminal 4 and 5 against PE (terminal W)
11 for terminal 4 and 5 against 0V (terminal 2)
Code 7: 30 for terminal D and E against PE (terminal G)
Enable Signal [V] Code 5/7: 5...30, Ri = 9 kOhm
Diagnostic Signal [V] +10...0...-10 / +Ub, rated max. 5 mA
EMC EN 61000-6-2, EN 61000-6-4
Central Connection Code 0/7
Code 5
6 + PE acc. EN 175201-804
11 + PE acc. EN 175201-804
Cable Specification Code 0/7: 7 x AWG16 overall braid shield
Code 5: 8 x AWG16 overall braid shield
Cable Length max. [m] 50
1) For applications with pT>35 bar (max 250 bar) the Y-port has to be connected and the plug in the Y-port has to be
removed.

8
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Parker D*FP proportional directional control valves
have an integral electronic and require only one sole
electrical common for the control system. Different
flow sizes, power down configuration as well as
command signal options are available to achieve
an optimal adaption for different applications.
Characteristics of Valve Driver
The described integral electronic driver combines
all necessary functions for the optimal operation of
the valve.Thanks to its excellent dynamic the valve
is usable within closed loop control applications.
The most important features are:
•฀high dynamic actuator principle with special
designed electronic driver
•฀closed loop controlled spool position
•฀constant current actuator control with overcur-
rent shutoff
•฀excellent properties for response sensitivity and
temperature drift
•฀differential input stage with various command
signal options
•฀diagnostic output for spool stroke / overcurrent
state
•฀standard central connection
•฀compatible to the relevant European EMC-
standards
Name Plate
Block Diagram of Integral Electronics
Code 0 (6+PE)
Code 5 (11+PE)
Code 7 (6+PE with enable)
PE
0...+/-10V
4...20mA
0...+/-10V
22...30V=
E
F
D
AB
PID
U
U
I
I
0
command
diagnostic
spool stroke
supply
voltage
G
enable
+5...30V
C

Prop. Directional Control Valve
Series DFplusOperation Manual
9Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
2. Safety Instructions
Please read the operation manual before instal-
lation, startup, service, repair or stocking! Paying
no attention may result in damaging the valve or
incorporated system parts.
Symbols
This manual uses symbols which have to be fol-
lowed accordingly:
Instructions with regard to the warranty
Instructions with regard to possible dam-
aging of the valve or linked system com-
ponents
Helpful additional instructions
Marking, Name Plates
Instructions applied on the valve, i.e. wiring dia-
grams and name plates, must be observed and
maintained legibly.
Work at the Valve
Workings in the area of installation, commissioning,
maintenance and repair of the valve may only be
allowed by qualified personnel.This means persons
which have, because of education, experience and
instruction, sufficient knowledge on relevant direc-
tives and approved technical rules.
3. Important Details
Intended Usage
This operation manual is valid for proportional direc-
tional control valves DF Plus series.Any different or
beyond it usage is deemed to be as not intended.
The manufacturer is not liable for warranty claims
resulting from this.
Common Instructions
We reserve the right for technical modifications of
the described product. Illustrations and drawings
within this manual are simplified representations.
Due to further development, improvement and
modification of the product the illustrations might
not match precisely with the described valve. The
technical specifications and dimensions are not
binding.No claim may resulting out of it.Copyrights
are reserved.
Liability
The manufacturer does not assume liability for
damage due to the following failures:
•฀incorrect mounting / installation
•฀improper handling
•฀lack of maintenance
•฀operation outside the specifications
Do not disassemble the valve! In case of
suspicion for a defect please return the valve
to the factory.
Storage
In case of temporary storage the valve must be
protected against contamination, atmospheric ex-
posure and mechanical damages. Each valve has
been factory tested with hydraulic oil, resulting in
protection of the core parts against corrosion. Yet
this protection is only ensured under the following
conditions:
Outdoor storage or within sea and tropical
climate will lead to corrosion and might disable
the valve!
Storage
period Storage requirements
12 months constant humidity < 60% as well
as constant temperature < 25°C
6 months varying humidity as well as
varying temperature < 35°C

10
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
4. Mounting / Installation
Scope of Supply
Please check immediately after receiving the valve,
if the content is matching with the specified scope
of supply. The delivery includes:
•฀valve
•฀operation manual
The central connector assembly has to be ordered
separately and is not included in the delivery.
Please check the delivery immediately after
receiving the shipment for apparent damages
due to shipping. Report shipment losses at
once to the carrier, the insurance company
and the supplier!
Mounting
•฀Compare valve type (located on the name plate)
with part list resp. circuit diagram.
•฀The valve may be mounted fix or movable in
any direction.
•฀Verify the mounting surface for the valve. Uneve-
ness of 0.01 mm/100 mm, surface finish of 6.3
µm are tolerable values.
Keep clean valve mounting surface and work
environment!
•฀Remove protection plate from the valve mounting
surface
•฀Check the proper position of the valve ports and
the O-rings.
•฀Mounting bolts:
D1FP: 4 pcs. M5x30
D3FP: 4 pcs. M6x40
use property class 12.9, DIN 912
Parker offers bolt kits:
D1FP: BK375 / D3FP: BK385
•฀Tighten the bolts crisscross with the following
torque values:
D1FP: 6.8 Nm / D3FP: 11 Nm
Insufficient condition of the valve mounting
surface migth create malfunction!
Incorrect mounting resp. bolt torque may
result in abrupt leakage of hydraulic fluid on
the valve ports.
Operation Limits
The valve may be operated within the determined
limits only. Please refer to the “technical data“ sec-
tion as well as to the “characteristic curves“ in the
catalog.
Follow the environmental conditions! Unal-
lowable temperatures, shock load, aggresive
chemicals exposure, radiation exposure, il-
legal electromagnetic emissions may result
in operating trouble and may lead to failure!
Follow the operating limits listed in the
“specifications“ table!
Pressure Fluids
The following rules applies for the operation with
various pressure fluids:
The above information serves for orientation
and does not substitute user tests among the
particular operating conditions. Particularly
no liabiliy for media compatibility may be
derived out of it.
mineral oil usable without restriction
HFA oil-in-water emulsion consultation required
HFB water-in-oil emulsion consultation required
HFC aqueous solution (glycols) consultation required
HFD unhydrous fluids (Phosphor-Ester) consultation required
For detailed information concerning pressure
fluids note VDMA-document 24317 as well as
DIN 51524 & 51502.
Special gaskets may be available depending on
the utilized fluid.
In case of insecurity please consult the factory.

Prop. Directional Control Valve
Series DFplusOperation Manual
11 Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Electrical Connection
The electrical connection of the valve takes place
by one common cable, which is coupled to the
integrated electronic driver by a central connector
assembly.
The connection code 0 as well as code 7 requires
a 6 + PE female connector EN 175201-804.
The female connector has to be ordered
separately under article nr. 5004072.
A female connector with metal housing is
required! Plastic made models may create
function problems due to insufficient EMC-
characteristics.
The connecting cable has to comply to the follow-
ing specification:
Cable type control cable, flexible,
7 conductors, overall braid
shield
Cross section min. AWG16
Outer dimension 8...12 mm
Cable length max. 50 m
For cable lengths > 50 m consult factory.
The connection cable is coupled to the female
connector by solder joints.
Skinning lengths for the connecting cable:
The connection Code 5 requires a 11 + PE female
connector EN 175201-804.
The female connector has to be ordered
separately under article nr. 5004711.
A female connector with metal housing is
required! Plastic made models may create
function problems due to insufficient EMC-
characteristics.
The connecting cable has to comply to the follow-
ing specification:
Cable type control cable, flexible,
8 conductors, overall braid
shield
Cross section min. AWG16
Outer dimension 12...15 mm
Cable length max. 50 m
For cable lengths > 50 m consult factory.
The connection cable is coupled to the female
connector by crimp contacts.
Skinning lengths for the connecting cable:
For the workmanlike termination of the crimp
contacts the tool # 932 507-001 – supplier:
Hirschmann – is required.
Do not disconnect cable socket under tension!

12
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Electrical Interfacing
Supply Voltage:
The supply voltage for the valve has to cover the
range of 22...30 V. The residual ripple may not
exceed 5% eff.
The applied power supply must comply to the
relevant regulations (DIN EN 61558) and must
carry a CE-mark. The operating voltage for
the valve must be free of inductive surges. Do
not exceed the max. value of 30V! Non-ob-
servance of this rule may result in permanent
damaging of the valve.
The increased inrush current of the valve
should be considered when selecting the
power supply. A stabilized power supply with
overcurrent limiting feature should not be
used. Due to the inrush current of the valve
the current limit circuit may respond prema-
turely and create problems during energizing
of the supply voltage.
The operation of the valve is blocked if the
supply voltage polarity is interchanged.
Each valve requires a separate pre-fuse of 4
Amp time lag.Non-observance of this instruc-
tion may create irreparable damage of valve
resp. incorporated system parts.
The shielding has to be assembled according the
outline below:
The backshell nut of the cable gland has to be
tighten with a suitable tool.The target value for the
tightening torque is 4 Nm. Tighten the cap nut with
a torque of approx.5 Nm after attaching the female
connector on the socket outlet.
Incomplete tightening of backshell nut resp.
cap nut may result in automatic release of the
connection as well as degradation of the
water tightness.
Follow the “instructions for use“ for installation
of female connectors made by other kind of
brands!
The cable connection to the female connector
has to take place by qualified personnel! A
short between individual conductors resp. to
the connector housing , bad soldering as well
as improper shield connection may result in
malfunction and breakdown of the valve.
The mounting surface of the valve has to be
carefully tied to the earth grounded machine
frame. The earth ground wire from the valve
connecting cable as well as the cable shield
have to be tied to the protective earth terminal
within the control unit. It is necessary to use
a low ohmic potential connection between
control unit and machine frame to prevent
earth loops (cross section AWG 6).

Prop. Directional Control Valve
Series DFplusOperation Manual
13 Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Wiring diagram of supply voltage
Code 0 (6 + PE)
Code 5 (11 + PE)
Enable input (only for option 5 / 11+PE as well as
option 7 / 6+PE)
A signal voltage enables the actuator drive of the
valve. Continuous operation of the valve requires
a permanent voltage 5...30 V (i.e. the supply volt-
age). In case of disabling the signal the valve will
reach its power down position independently from
the command signal value. At the same time the
position controller output will be clamped.In case of
restarting the enable signal, the valve spool takes
its position always out of the power down position.
Preferable the enable signal should be switched on
together with the hydraulic pressure supply. This
forces the actuator drive into drop out condition
when the hydraulic system is switched off, and it
avoids needless heating of the actuator.
The enable function represents no safety
arrangement against unwanted valve opera-
tion in terms of rules for accident prevention!
To block the valve function under all conditions,
more advanced steps are necessary, i.e. the
installation of additional safety check valves.
Code 7 (6 + PE)

14
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Wiring diagram of enable input
Code 5 (11 + PE)
Incorrect signal amplitude levels may disturb
the functionality and can damage the valve.
The option 4...20 mA uses the “0 mA“ condition
as breakdown-information. This means the
presence of an evaluable failure information
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 deter-
mination 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 5: pin 5, Code 7: pin E
Details are shown from the technical specifica-
tions.
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.
Code 7 (6+PE)
B
C
D
E
F
A
Ue
0V
control system
valve
enable
signal < 5V
> 5...30 V
U
U
B-C
B-C
off
on
enable signal actuator drive

Prop. Directional Control Valve
Series DFplusOperation Manual
15 Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Wiring diagram of voltage command input +10...0...-10 V
Code 0 (6 + PE)
Code 7 (6 + PE)
Wiring diagram of voltage command input +10...0...-10 V
Code 5 (11 + PE)
B
C
D
E
F
A
Uc
0V
command
signal
control system
valve command signal function
0...+10 V
U
D-E
0V
U
D-E
0...-10 V
U
D-E
Wiring diagram of current command input +20...0...-20 mA
Code 0 (6 + PE)
Code 7 (6 + PE)
Wiring diagram of current command input +20...0...-20 mA
Code 5 (11 + PE)

16
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Wiring diagram of current command input 4...12...20 mA
Code 0 (6 + PE)
Code 7 (6 + PE)
Wiring diagram of current command input 4...12...20 mA
Code 5 (11 + PE)

Prop. Directional Control Valve
Series DFplusOperation Manual
17 Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
Wiring diagram of diagnostics output
Code 5 (11 + PE)
Wiring diagram of diagnostics output
Code 0 (6 + PE)
Diagnostics output:
A diagnostics signal is available. Its voltage repre-
sents the operating condition of the valve.
The following information is available:
•฀D1/3FP: position of valve spool (+10...0...-10 V
means +100...0...-100 % spool stroke).
•฀D30FP: position of pilot spool (+10...0...-10 V me-
ans +100...0...-100 % spool stroke).
•฀status of the actuator drive (supply voltage level
+22...30 V for disconnected drive due to overload
condition).
The output may drive a load of max. 5 mA.
Exceeding of this limit leads to malfunction.
Wiring diagram of diagnostics output
Code 7 (6 + PE)
B
C
D
E
F
A
Ud
0V
V
control system valve
diagnostic signal
0...+10 V
UB-F
0V
UB-F
s
0...-10 V
+22...30 V (U
U
U
B-F
B-F
spool stroke function actuator drive
)
0...+100 %
0
0...-100 %
on
on
on
overloaded
0
diagnostic
signal
preferred hydraulic initial (fail safe) state - depends on type
P-A/B-T
P-B/A-T

18
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
5. Operating Instructions
Basically the valve performs the task of converting a
command signal into a proportional spool stroke with
the highest possible dynamic. For these purposes
the input value will be electronically compared
with the actual spool position value. The signal
difference feeds a position controller, that in turn
provides via a power amplifier stage the required
current for the actuator.
Preferred Hydraulic Initial State
The valve has -as all zero lap valves- no safe
initial state when switched off.In this case the
valve takes a position which is selectable by
the valve type (preferred hydraulic initial state).
This position depends on contamination
level and therefore is not ensured.That applies
also for pressure drops above 120 bar at
single flow path on the control lands A-T resp.
B-T. We would therefore recommend the ap-
plication of additional check valves with se-
quential control.
Solenoid Current Monitoring
The electronic driver contains a circuit to monitor
the solenoid current. The current measurement
compares for exceeding of a certain value and
switches off after a time period of approx. 10 sec.
for temperature rise protection of the actuator.
For normal operating conditions this state will not
reached, but it may occur with a contaminated
sluggish valve.
In this case the reason for the contamination
should be repaired (hydraulic fluid exchange,
filtration review, valve flushing).
The overcurrent shutoff condition may be resetted
by the actions below:
Code 0: Temporary disconnection of the supply
voltage.
Code 5: Temporary disconnection of the enable
signal.
Code 7: Temporary disconnection of the enable
signal.
The shutoff of the actuator drive due to overload
will be signaled via the diagnostics output.
The condensed function conditions of the actuator
drive are given below:
The actuator drive is enabled, if:
the actuator drive is in normal operation, AND cur-
rent of > 3.8 mA flows into input (4...20 mA option)
The actuator drive is disabled, if:
the actuator drive is in overload operation, OR cur-
rent of < 3.6 mA flows into input (4...20 mA option)
Zero Position Adjustment
The valve zero position is already pre-adjusted by
the factory. However, the valve has additionally the
option for manual adjustment of the zero position.
This allows for zero adjustment of the flow inde-
pendently from further system parameters. The
adjustment takes place by a multiturn trimming
potentiometer, which is accesible on the top side of
the valve after removing of a cover screw. Required
default conditions prior to the adjustment procedure:
•฀supply voltage switched on
•฀command input signal of 0 V resp. 0 mA / 12mA
•฀hydraulic system switched on
The adjustment requires a screw driver with
a blade width of 2 mm.
Usage of unsuitable tooling may cause ir-
reparable damages to the valve!
After adjustment of zero position the cover
screw has to be refitted including the seal.

Prop. Directional Control Valve
Series DFplusOperation Manual
19 Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
There are three important sources of dirt to watch
for:
•฀contamination arising during installation
•฀contamination arising during operation, friction
wear
•฀impurities from the environment
Basically a purity level class of 7 acc. NAS 1638
is required.
Pay attention to maintenance details!
Flushing
It is recommended to flush the long pipelines by short
circuiting the pressure and return lines, especially
for large, central pressure oil stations.This prevents
the installation dirt from entering the valve.
Air Bleeding of Hydraulic System
During initial startup, after an oil change as well as
after the opening of lines or valves the hydraulic
system must be air bleeded. Air in the hydraulic
system is very disadvantageous and therefore
undesirable for the control system.
Filter
The function and lifetime of the valve are strongly
affected by the cleanliness of the fluid.
Dirt is the greatest enemy of the hydraulic
system!
Code 0 (6 + PE)
Code 5 (11 + PE)
wiring information center position adjustment
+22..30V Power A
0V Power B
0V Diagnosis C
+ Command D
- Command E
Diagnosis F
PE G
!
Do not disconnect
cable socket
undertension!
Steckverbindung
nicht unter
Spannung trennen!
wiring information center position adjustment
Center Position
Adjust
!
Do not disconnect
cable socket
undertension!
Steckverbindung
nicht unter
Spannung trennen!
+22..30V Power 1
0V Power 2
Enable 3
+ Command 4
- Command 5
Diagnosis 6
0V Diagnosis 7
Enable Return 8
+22..30V 9
0V 10
+22..30V Return 11
PE

20
Prop. Directional Control Valve
Series DFplusOperation Manual
Parker Hannifin Corporation
Hydraulic Controls Division
D_FP_20 5715-658 UK.indd CM 06.11.13
6. Maintenance
Service work may only be carried out by
qualified personnel. Detailed knowledge of
the machine functions concerning switching
on and off as well as of the required safety
relevant technical tasks is required!
Periodical maintenance is essential for the longevity
of the system and guarantees reliability and avail-
ability. The following properties of the system has
to be checked in continuous short time intervals:
•฀oil level in the tank
•฀max. working temperature
•฀condition of the pressure fluid (visual inspection,
colour and smell of hydraulic fluid)
•฀working pressure levels
•฀gas pre-load pressure on the pressure accumu-
lator
•฀leakage on all system components
•฀condition of filter elements
•฀condition of hose lines
•฀cleanliness of components
After a certain operating duration a change of the
hydraulic fluid is required.The frequency of change
depends from the following circumstances:
•฀kind resp. grade of the pressure fluid
•฀filtering
•฀operating temperature and environmental condi-
tions
7. Trouble Shooting
Basis of troubleshooting is always a systematic
approach. At first the following questions have to
be checked:
•฀Are there practical experiences with similar
failures?
•฀Have system adjustments been changed?
Afterwards starting of troubleshooting by means of
a priority list of the most likely reasons.
For suspect of a sluggish spool the valve may
be flushed with clean pressure fluid.
Troubleshooting in a hydraulic system requires
in either case a systematic approach. The
work may exclusively be performed by quali-
fied personnel, as it requires detailed knowl-
edge about function and construction of the
system. Reversals or dissassemblings may
not be taken imprudently! Prior to the works
it has to be clarified, if the system has been
operated properly until the failure occured.
malfunction at hydraulic load runtime
- generally no function
- high frequent oscillation
- low frequent oscillation
- one way operation only
- speed variations at unchanging command
- different speeds depending on travel direction
- speed too low
- drifting without command
possible reasons for malfunction corrective actions
Xhydraulic pump resp. motor defective replace hydraulic pump resp. motor
X XXXXX drive overloaded reduce pressure resp. speed, increase valve size
X XXXXXXvalve contaminated clean pressure fluid, filter / flush valve
X X hydraulic fluid too viscous / too cold change fluid grade, provide operational temperature
X X X too low oil level within tank refill pressure fluid
XXX filter contaminated clean resp. replace filter
X X X X supply voltage too low keep supply voltage range
Xsupply voltage carries too much ripple reduce ripple
XXXcommand signal too low increase command signal
Xcommand signal carries too much ripple reduce ripple
X X center position adjustment incorrect check center position adjustment
X X X X X contacts of central connector contaminated clean contacts / replace plug
Xfeed cable interrupted fix feed cable
X X X X X X X wiring sequence incorrect correct wiring sequence
X X feed cable without shielding change cable grade