Control Options; Electrical Displacement Control (Edc); Edc Control Signal Requirements - Danfoss H1 Series Technical Information

Technical Information
H1P 115/130 Axial Piston Single Pumps

Control Options

Electrical Displacement Control (EDC)

© Danfoss | May 2018
The Electrical Displacement Control (EDC) consists of a pair of proportional solenoids on each side of a
three-position, four-way porting spool. The proportional solenoid applies a force input to the spool,
which ports hydraulic pressure to either side of a double acting servo piston.
Differential pressure across the servo piston rotates the swash-plate, changing the pump's displacement
from full displacement in one direction to full displacement in the opposite direction. A serviceable 125
μm screen is located in the supply line immediately before the control porting spool.
Under some circumstances, such as contamination, the control spool could stick and cause the pump to
stay at some displacement.
Electrical Displacement Control
P003 191

EDC Control Signal Requirements

Pump displacement vs. control current
100 %
-b -a
"0"
a
100 %
EDC schematic, feedback from swash-plate
C1
F00B
Current mA
b
M14
C2
F00A T P
Feedback from
Swash plate
P003 478E
BC00000198en-US0901 | 17