13
EATON
EP Control for Medium Duty 72400 Piston Pumps Parts & Service 08-10-0003-EN-0901 September 2001
Interconnect
Schematic
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
Power Supply Connector
PINS WIRE COLOR
SIGNAL
A
Red
+ Supply Voltage
B
Black
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
A
Black
Ref Low - 1 Vdc
1 to 6 Vdc Potentiometric
B
Green
Command (wiper)
C
Red
Ref Hi - 6 Vdc
A
Orange
Loop Return
4 to 20 mA Current Loop
B
White
Loop In
C
No Connection Required*
*EP Control Electronic Module Mating Connector Kit 990762-000 contains plug
used to seal mating end connector.
Pump Displacement
vs. Input Signal
Typical Control Characteristics
Full Stroke Port B Flow*
Full Stroke Port A Flow*
Minimum Neutral Range
A
B
C
D
E
*Note:
Actual flow direction depends
on pump type and rotation
A
B
C
D
E
(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
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.
