Eaton EP Control User manual

Eaton®Electronic Proportional (EP) Control
for Medium Duty 72400 Piston Pumps
Installation 04-10-0003
EN-0901

2
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Identification of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Required Tools for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EP Control Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Neutral Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Interconnect Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Troubleshooting Reference Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Information contained in this installation booklet is accurate as of the publication
date and is subject to change without notice. Performance values are typical val-
ues. Customers are responsible for selecting products for their applications
using normal engineering methods.

3
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Introduction
The following information describes the installation of the Electronic Proportional
(EP) Control for Eaton®Medium Duty 72400 piston pumps. Review this information
to become familiar with the procedures required before beginning any installation.
In order to assure the most reliable installation
and operation of any electronic control, proper
component selection and installation procedures
must be followed with respect to interconnection wiring harnesses, input
command signal devices, fusing, and input power switching.
Appropriate industry practices must be followed to prevent damage of and
shorting of all electrical and electronic components caused by environmental
hazards and application specific hazards. Typical hazards that damage the
wiring harnesses or other components are abrasion, moving objects, and heat
from the engine or exhaust system. Moisture can damage poorly sealed
connectors and/or components, causing short circuits and other problems like
corrosion.
A switch must be installed in line with (+ battery) power to the electronic
module, so that power may quickly be disconnected in case of emergency
(component failure or inadvertent commands). A fuse rated at the maximum
module operating current (3 Amp) must be installed in the + battery line to the
electronic module.
All the electrical connections to the EP Control electronic module must be
disconnected prior to performing any electrical welding on the vehicle or
machine.The electronic module and/or the hydraulic pump are not to be
used as a connection point for electrical welding equipment.
During initial start-up and/or checkout of the machine after service, the
machine must be placed on jack stands to prevent inadvertent movement.
The reliable operation and suitability of this product is dependent upon how
it is applied and the other components used in the system. The system
integrator must review all aspects of the application and all of the
components used to assure proper operation and reliability.
CAUTION

4
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Identification of Components
Electronic
Module
2 ea. Electronic
Module Bracket
Solenoid Coil
Subassembly
Valve Assembly
Solenoid Coil
Subassembly
Control Valve
Gasket
Solenoid Tube
Subassembly
Solenoid Tibe
Subassembly
4 ea. 1.75" -
10-24 Button Head
Cap Screws
4 ea. #10
Lockwashers
6 ea. 2.75" - 5/32" 10-24
Hex Head Cap Screws
Torque to 60-68 lbf-in.
2 ea. 1.25" - 5/32" 10-24
Hex Head Cap Screws
Torque to 60-68 lbf-in.
2 ea. 1.25" - 5/32" 10-24
Hex Head Cap Screws
Torque to 60-68 lbf-in.
Required tools
for Installation:
•1/8" Bit Socket or Hex Key
•5/32" Bit Socket or Hex Key
•9/16" Open End Wrench
•3/4" Open End Wrench
•Flat Blade Screwdriver
•12 VDC Power Supply or Battery
•Voltage Ohm Meter (VOM)
•Charge Pressure Gauge

5
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
MODEL INPUT VALVE ELECTRONIC
KIT NO. CODE REF. KIT DESCRIPTION SIGNAL ASSEMBLY MODULE VOLTAGE
9900015-000 EE EP Ctrl Kit MD 72400: 1-6 V 4993057-012 111520-016 12/24 V
1-6 V input,
w/o brackets
9900016-000 EC EP Ctrl Kit MD 72400: — 4993057-012 — 12 V
12 V coils w/o
electronics
9900017-000 ED EP Ctrl Kit MD 72400: — 4993057-024 — 24 V
24 V coils
w/o electronics
9900018-000 EL EP Ctrl Kit MD 72400: ±100 mA 4993057-012 111520-100 12/24 V
±100 mA input,
w/o brackets
9900019-000 EG EP Ctrl Kit MD 72400: ±4-20 mA 4993057-012 111520-020 12/24 V
±4-20 mA input,
w/o brackets
9900020-000 EL EP Ctrl Kit MD 72400: ±100mA 4993057-012 111520-100 12/24 V
±100 mA input
9900021-000 EG EP Ctrl Kit MD 72400: ±4-20 mA 4993057-012 111520-020 12/24 V
±4-20 mA input
9900022-000 EE EP Ctrl Kit MD 72400: 1-6 V 4993057-012 111520-016 12/24 V
1-6 V input
990830-000 EP Crtl Electronic 1-6 V — 111520-016 —
Module 1-6 V
990831-000 EP Crtl Electronic ±100 mA — 111520-100 —
Module ±100 mA
990832-000 EP Crtl Electronic ±4-20 mA — 111520-020 —
Module ±4-20 mA
72400-942 Brackets and Screws
Note: All kits using Eaton Electronic Modules use 12 V coils.
EP Control Kits

6
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Disassembly
Step 1
Clean the pump thoroughly. If conversion will be performed without removing
pump from machine, case fluid level will need to be lowered below EP Control
mounting surface.
Step 2
Remove the manual displacement control. Using a 5/32" hex key or bit socket,
remove the cap screws and discard.
Step 3
Carefully lift the manual displacement control away from the pump to disengage the
feedback link from the servo piston land.
Installation

7
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Step 4
Remove the control valve gasket from the pump housing and discard.
With a 5/32" hex key or bit socket, remove the two top hex head cap screws on
each side of the servo piston cap so the “L” brackets for the electronic module can
be mounted.
Remove
top hex
head cap
screws
on each
side.

8
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Reassembly
Step 6
Locate the EP Control valve assembly, electronic module, bolts, washers and
control valve gasket. Clean the control mounting surface and install a new control
valve gasket by aligning with bolt and porting holes.
Step 7
Carefully install the EP Control valve assembly on the pump housing, making sure
the feedback link is installed in the appropriate servo piston land. Note: There is a
narrow land on the servo piston for the EP Control feedback link and a wide land for
the swashplate link.
Step 8
Use a 5/32" hex key or bit socket to install the six 10-24 hex head cap screws.
Torque to 60-68 lbf·in.

9
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Step 9
Neutral Adjustment
Caution: All hoses and fittings must be connected, and the pump ready for
operation before attempting to check neutral adjustment. Electrical wiring harnesses
for the solenoid coils and command input should be left disconnected while adjust-
ing neutral.
A. Disengage the input drive to vehicle or elevate wheels.
B. Install charge pressure gauge. A 0-1000 psi or 0-1500 psi pressure gauge is
recommended.
C. Start the prime mover.
D. Loosen the locknut holding the neutral adjustment screw until it is just snug
enough that the threaded screw can be rotated. Use a 9/16" end wrench to hold
the locking nut while rotating the neutral adjustment screw.
E. Note the number stamped on the cap of the low pressure relief valve. -022 is
220 psig (15 bar), -030 is 305 psig (21 bar), etc. This will be the high setting.
Settings can vary from 155 psig (11 bar) to 325 psig (22.4 bar).

10
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
F. Slowly rotate the neutral adjustment screw clockwise until charge pressure drops
to its low setting. Mark the neutral adjustment screw location.
Note: The charge pressure low setting is usually 40-60 psig lower than the high
setting.
G. Rotate the neutral adjustment screw counterclockwise. The charge pressure will
rise. Continue turning counterclockwise until the pressure drops again to its low
setting. Mark the neutral adjustment screw location.
H. Rotate the neutral adjustment screw to the position between the two marks.
I. Carefully hold adjustment screw while torquing locknut. Torque locknut to 10±1
lbf·ft. Neutral adjustment is completed.
Alignment slot to be
towards control spool ±90˚
Spool
Solenoid Solenoid
300
200 400
100 500
0600
PSI
300
200 400
100 500
0600
PSI
High
Setting Range
Low
Setting Range

11
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Step 11
Connect the four-pin connector between the EP Control electronic module and the
solenoid coils. The connectors must be latched securely.
Step 10
Install the two “L” brackets on each end of the servo piston cap with the flat end
facing up to hold the electronic module. Replace the 10-24 cap screws on the
pump and torque with 5/32" hex key or bit socket to 60-68 lbf·in.

12
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Step 14
If applicable, disconnect power to the input device. Connect the command input
device to the three-pin connector on the EP Control electronic module.
Step 15
Disconnect electrical power to the vehicle or system. Connect the electrical power
source to the two-pin connector on the EP Control electronic module. Install a 3
Amp SLO-BLO®fuse per the Interface Diagram on page 15.
Step 16
The pump is now ready to return to operation.
Step 12
Carefully position the EP Control electronic module. Tuck all cables under the
module. Caution: Avoid pinching cables at mounting points.
Install the four lockwashers and four 10-24 button head cap screws. Place two of
the screws through the “L” brackets. Using a 1/8” hex key or bit socket, torque the
four screws to 60-68 lbf·in.

13
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
A +
B -
POWER
SUPPLY
CONNECTOR
(2-Pin)
see chart
Customer
Supplied
Components Valve
Assembly
Electronic
Module Proportional
Solenoid 1
Solenoid
Connector
Proportional
Solenoid 2
S1
S2
P
Mechanical
Swashplate
Feedback
Supply Orifice
(Optional)
Servo Orifices
(Optional)
A
B
C
COMMAND
INPUT SIGNAL
CONNECTOR
(3-Pin)
see chart
Battery or
Power Supply
FUSE
On/Off Switch
+-
A
B
C
D
Interconnect Schematic
Power Supply Connector
PINS WIRE COLOR SIGNAL
ARed + Supply Voltage
BBlack Supply Return
Fuse Rating
3 Amp SLO-BLO®(Time Delay) fuse for
12-24 Vdc system - customer supplied
Command Input Signal Connector
COMMAND INPUT SIGNAL PINS WIRE COLOR SIGNAL
ABlack Ref Low - 1 Vdc
1 to 6 Vdc Potentiometric B Green Command (wiper)
CRed Ref Hi - 6 Vdc
AOrange Loop Return
4 to 20 mA Current Loop B White Loop In
CNo Connection Required*
ABlue Loop Return
±100 mA Differential B White Loop In
CNo Connection Required
*EP Control Electronic Module Mating Connector Kit 990762-000 contains plug
used to seal mating end connector.

14
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Pump Displacement vs. Input Signal
Typical Control Characteristics
Full Stroke Port B Flow*
Full Stroke Port A Flow*
Minimum Neutral Range
A
BC D E
*Note: Actual flow direction depends
on pump type and rotation
ABCDE
(MAX) (MIN) (MIN) (MAX)
Command Input Signal
1-6 Vdc 1.5 Vdc 3.3 Vdc 3.5 Vdc 3.7 Vdc 5.5 Vdc
±4-20 mA -20 mA -4.5 mA 0 mA +4.5 mA +20 mA
±100 mA -100 mA -7.5 mA 0 mA +7.5 mA +100 mA
Shaft Rotation
CCW Solenoid #2 Neither Solenoid #1
Flow OUT port “B” No flow Flow OUT port “A”
CW Solenoid #2 Neither Solenoid #1
Flow OUT port “A” No Flow Flow OUT port “B”
Note: The +20 mA command input signal configuration operates the pump
in one direction. The customer has to change the polarity on the -20 mA
signal to operate the pump in the opposite direction.

15
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Troubleshooting
No Flow in Either Defective Power Check Power Input. Disconnect the two-pin power
Direction Connection, or supply connector from the EP Control electronic module.
Loose Wires Inspect the two connectors for corrosion, loose
wires or broken wires. Measure the DC voltage across
pins “A” and “B” at the connector. The reading should
be between 9 to 30 Vdc.
Command Signal Check Command Input Signal. Disconnect the three-pin
Missing command input device connector from EP Control
electronic module. Inspect the two connectors for
corrosion, loose contacts, loose wires and broken wires.
If joystick or potentiometer is used, measure the DC
voltage across pins “A” and “B” at the connector. Move
the joystick or potentiometer position. The voltage
reading will be approximately 2.5 volts DC at joystick
neutral or the half range position of the potentiometer.
The DC voltage will be approximately 5 volts at one end of
the joystick or potentiometer travel. At the opposite end
of travel the DC voltage will be approximately zero.
If ±4-20 mA current loop input is used, measure the DC
voltage across pins “A” and “B” at the connector. The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±5 volts
for input command currents of ±20 mA respectively.
If ±100 mA differential input is used, measure the DC
voltage across pins “A” and “B” at the connector The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±2.8 volts
for input command currents of ±100 mA respectively.
Defective Check Solenoid Coil. Disconnect the two-pin power
Solenoid Coil supply and the three-pin command input device
connectors from the EP Control electronic module.
Inspect the connectors for corrosion, loose contacts,
loose wires and broken wires. Remove the EP Control
electronic module. Reverse Steps 11 and 12 on pages 11
and 12. Disconnect the two mating four-pin connectors.
Measure the coil resistance across the designated pins
at the solenoid four-pin connector. Refer to the Solenoid
4-pin Connector chart on page 19 for typical readings.
Defective Check Electronic Module. Disconnect the two-pin power
Electronic Module supply and the three-pin command input device
connectors from the EP Control electronic module.
Inspect the connectors for corrosion, loose contacts,
loose wires and broken wires. Remove the EP Control
electronic module. Reverse Steps 11 and 12 on pages 11
and 12. Caution: The engine or motor driving the pump
should not be running. Connect command input device
and power to the module. Measure the current to the
coil at the four-pin connector. Activate the input device
end to end and at neutral. Monitor the current on one
coil, and then on the other. Refer to Command Input
Device chart on page 19 for typical readings.
SYMPTOM CAUSE ACTION

16
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
No FLow in Either Manual Override Check Manual Override. Disconnect two-pin power
Direction (con’t) Does Not Function supply and the three-pin command input device
connectors from the EP Control electronic module.
Inspect the connectors for corrosion loose contacts,
loose wires and broken wires. Remove the valve
assembly. Reverse instructions on page 8. Use a small
Phillips screwdriver to push on the manual override of the
solenoid tube’s solenoid tube actuator pin.
Flow Only in One Command Signal Check Command Input Signal. Disconnect the three-pin
Direction Missing command input device connector from the EP Control
electronic module. Inspect the two connectors for
corrosion, loose contacts, loose wires and broken wires.
If joystick or potentiometer is used, measure the DC
voltage across pins “A” and “B” at the connector. Move
the joystick or potentiometer position. The voltage
reading will be approximately 2.5 volts DC at joystick
neutral or the half range position of the potentiometer.
The DC voltage will be approximately 5 volts at one end of
the joystick or potentiometer travel. At the opposite end
of travel the DC voltage will be approximately zero.
If ±4-20 mA current loop input is used, measure the DC
voltage across pins “A” and “B” at the connector. The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±5 volts
for input command currents of ±20 mA respectively.
If ±100 mA differential input is used, measure the DC
voltage across pins “A” and “B” at the connector The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±2.8 volts
for input command currents of ±100 mA respectively.
Defective Check Solenoid Coil. Disconnect the two-pin power
Solenoid Coil supply and the three-pin command input device
connectors from the EP Control electronic module.
Inspect the connectors for corrosion, loose contacts,
loose wires and broken wires. Remove the EP Control
electronic module. Reverse Steps 11 and 12 on pages 11
and 12. Disconnect the two mating four-pin connectors.
Measure the coil resistance across the designated pins
at the solenoid four-pin connector. Refer to the Solenoid
4-pin Connector chart on page 19 for typical readings.
Defective Solenoid Check Solenoid Tube Subassembly. Disconnect the two-
Tube Subassembly pin power supply and the three-pin command input
device connectors from the EP Control electronic module.
Inspect the connectors for corrosion, loose contacts,
loose wires and broken wires. Remove the two solenoid
tube subassemblies. Visually inspect the actuator pin in
the tube subassembly. The pin should be free to move.
SYMPTOM CAUSE ACTION

17
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Flow Only in One Defective Check Electronic Module. Disconnect the two-pin power
Direction (con’t) Electronic Module supply and the three-pin command input device
connectors from the EP Control electronic module.
Inspect the connectors for corrosion, loose contacts,
loose wires and broken wires. Remove the EP Control
electronic module. Reverse Steps 11 and 12 on pages 11
and 12. Caution: The engine or motor driving the pump
should not be running. Connect command input device
and power supply to the electronic module. Measure the
current to the coil at the four-pin connector. Activate the
input device end to end and at neutral. Monitor the
current on one coil, and then on the other. Refer to
Command Input Device chart on page 19 for typical
readings.
Flow in Neutral Command Signal Check Command Input Signal. Disconnect the three-pin
Incorrect command input device connector from the EP Control
electronic module. Inspect the two connectors for
corrosion, loose contacts, loose wires and broken wires.
If joystick or potentiometer is used, measure the DC
voltage across pins “A” and “B” at the connector. Move
the joystick or potentiometer position. The voltage
reading will be approximately 2.5 volts DC at joystick
neutral or the half range position of the potentiometer.
The DC voltage will be approximately 5 volts at one end of
the joystick or potentiometer travel. At the opposite end
of travel the DC voltage will be approximately zero.
If ±4-20 mA current loop input is used, measure the DC
voltage across pins “A” and “B” at the connector. The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±5 volts
for input command currents of ±20 mA respectively.
If ±100 mA differential input is used, measure the DC
voltage across pins ”A” and “B” at the connector The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±2.8 volts
for input command currents of ±100 mA respectively.
Neutral Out of Check Neutral Adjustment. Disconnect the two-pin
Adjustment power supply and the three-pin command input device
connectors from the EP Control electronic module.
Inspect the connectors for corrosion, loose contacts,
loose wires and broken wires. Remove the EP Control
electronic module. Reverse Steps 11 and 12 on pages 11
and 12. Disconnect the two four-pin solenoid connectors.
Follow instructions for setting neutral on page 9 Step 9.
Flow Limited, Command Signal Check Command Input Signal. Disconnect the three-pin
Cannot Achieve Incorrect command input device connector from the EP Control
Full Pump Stroke electronic module. Inspect the two connectors for
corrosion, loose contacts, loose wires and broken wires.
SYMPTOM CAUSE ACTION

18
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Flow Limited, Command Signal If joystick or potentiometer is used, measure the DC
Cannot Achieve Incorrect voltage across pins “A” and “B” at the connector. Move
Full Pump Stroke the joystick or potentiometer position. The voltage
(con’t) reading will be approximately 2.5 volts DC at joystick
neutral or the half range position of the potentiometer.
The DC voltage will be approximately 5 volts at one end of
the joystick or potentiometer travel. At the opposite end
of travel the DC voltage will be approximately zero.
If ±4-20 mA current loop input is used, measure the DC
voltage across pins “A” and “B” at the connector. The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±5 volts
for input command currents of ±20 mA respectively.
If ±100 mA differential input is used, measure the DC
voltage across pins ”A” and “B” at the connector. The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±2.8 volts
for input command currents of ±100 mA respectively.
Defective Check Electronic Module. Disconnect the two-pin power
Electronic Module supply and the three-pin command input device
connectors from the EP Control electronic module.
Inspect the connectors for corrosion, loose contacts,
loose wires and broken wires. Remove the EP Control
electronic module. Reverse Steps 11 and 12 on pages 11
and 12. Caution: The engine or motor driving the pump
should not be running. Connect command input device
and power supply to the electronic module. Measure the
current to the coil at the four-pin connector. Activate the
input device end to end and at neutral. Monitor the
current on one coil, and then on the other. Refer to
Command Input Device chart on page 19 for typical
readings.
Manual Override Check Manual Override. Disconnect the two-pin power
Does Not Function supply and the three-pin command input device
connectors from the EP Control electronic module.
Inspect the connectors for corrosion loose contacts,
loose wires and broken wires. Remove the valve
assembly. Reverse instructions on page 8. Use a small
Phillips screwdriver to push on the manual override of the
solenoid tube’s actuator pin should move the spool.
Does Not Return Command Signal Check Command Input Signal. Disconnect the three-pin
to Neutral Incorrect command input device connector from the EP Control
electronic module. Inspect the two connectors for
corrosion, loose contacts, loose wires and broken wires.
If joystick or potentiometer is used, measure the DC
voltage across pins “A” and “B” at the connector. Move
the joystick or potentiometer position. The voltage
reading will be approximately 2.5 volts DC at joystick
neutral or the half range position of the potentiometer.
The DC voltage will be approximately 5 volts at one end of
the joystick or potentiometer travel. At the opposite end
of travel the DC voltage will be approximately zero.
SYMPTOM CAUSE ACTION

19
EATON CORPORATION Fluid Power
EP Control for Medium Duty 72400 Piston Pumps
Installation 04-10-0003-EN-0901 September 2001
Does Not Return Command Signal If ±4-20 mA current loop input is used, measure the DC
to Neutral (con’t) Incorrect voltage across pins “A” and “B” at the connector. The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±5 volts
for input command currents of ±20 mA respectively.
If ±100 mA differential input is used, measure the DC
voltage across pins “A” and “B” at the connector The
DC voltage reading should be approximately zero at zero
input current which occurs at command input neutral.
The DC voltage reading should be approximately ±2.8 volts
for input command currents of ±100 mA respectively.
Neutral Out of Check Neutral Adjustment. Disconnect the two-pin
Adjustment power supply and the three-pin connectors from the
EP Control electronic module. Inspect the connectors for
corrosion, loose contacts, loose wires and broken wires.
Remove the EP Control electronic module. Reverse Steps
11 and 12 on pages 11 and 12. Disconnect the two
solenoid four-pin connectors. Follow instructions for
setting neutral on page 9 Step 9.
SYMPTOM CAUSE ACTION
Troubleshooting Reference Settings
Solenoid 4-Pin Connector
PINS SOLENOID 12 VOLT COIL 24 VOLT COIL
A & B Coil 1 5 ohms 21 ohms
C&D Coil 2 5 ohms 21 ohms
Note: Only 12 volt coils are used with EP Control electronics module
Joystick Position
DC VOLTAGE MEASURED ACROSS DESIGNATED
PINS AT THE CUSTOMER THREE-PIN CONNECTOR
Ato B
Full-Forward 5 Vdc
Neutral 2.5 Vdc
Full-Reverse 0 Vdc
Command Input Device – 12/24 Volt Systems (5 Ωcoils)
CURRENT TO COIL 1 CURRENT TO COIL 2
PINS A & B PINS C & D
YELLOW & WHITE WIRES ORANGE & BLACK WIRES
Max command in Minimum 1.5 A 0 A
one direction Maximum 2.0 A 0 A
Neutral 0 A 0 A
Max command in 0 A Minimum 1.5 A
the same direction 0 A Maximum 2.0 A

© 2001 Eaton Corporation
All Rights Reserved
Printed in USA
Form No. 04-10-0001
EN-0901
September 2001
ISO-9001 CERTIFICATED FIRM
DET NORSKE VERITAS INDUSTRY BV, THE NETHERLANDS
ACCREDITED BY
THE DUTCH COUNCIL
FOR CERTIFICATION
Reg. No. 24
Quality System Certified
Products in this publication are manufactured
in an ISO-9001-certified site.
Eaton Hydraulics, Inc.
14615 Lone Oak Road
Eden Prairie, MN 55344
Telephone: [phone]
Fax: [phone]
www.eatonhydraulics.com
Eaton Hydraulics, Inc
46 New Lane, Havant
Hampshire PO9 2NB
England
Telephone: [phone]
Fax: [phone]