Ee Control; Operation; General Description - Danfoss 51 Series Service Manual

Service Manual

EE Control

Operation

Series 51 Electrohydraulic Proportional Controls Service Manual

General Description

The EE controls consist of a ported housing mounted directly on the end cap. The ported housing has a
piston and a pushpin that contact the 4-way valve (F32), and a ball-check valve. A pressure control pilot
(PCP) is mounted on the control housing.
The PCP produces a differential output pressure. It's proportional to the applied electrical input signal.
Differential pressure is fed to the piston ends. When differential pressure reaches the preset threshold
force on the piston it causes the 4-way valve (F32) to move. The 4-way valve ports servo supply pressure
to the servo piston. This changes the motor's displacement.
Circuit Diagram for Motor with EE Control
L2
A
A1
T6
T4
B1
B
L1
M7
Ports:
A, B = Main pressure lines
L1, L2 = Drain lines
M1, M2 = Gauge port for A and B
M3, M4 = Gauge port servo pressure
X3 (M5) = Servo pressure supply
M7 = Gauge port control pressure
XA, XB = Control pressure ports hydraulic brake pressure defeat
T1, T2, T3, T4, T6, T7, T8, U7= Optional orifices
N = Speed sensor
EE controls have a metri-pack connector.
11009448 • Rev BA • July 2014
M4 M3
max
disp.
T3
T2
T7 T8
T1
X1 M8
P101 930
M1
M5
M2
29