Bosch Rexroth A7VO 63 Series - EP - Proportional Electric Control; Characteristic Curve EP2 Positive Control; Schematic EP2

Bosch Rexroth AG, RE 92202/02.2015
20 A7VO Series 63 | Axial piston variable pump
EP – Proportional electric control
EP – Proportional electric control
The proportional electric control, type EP, provides continu-
ous control of the displacement. Control is proportional to
the electric control current applied to the solenoid.
▶ Control from V
gmin
to V
gmax
(positive control)
As the pilot pressure increases, the pump swivels to a
larger displacement.
A control pressure of 40bar is needed to swivel the pump
from its initial position V
gmin
to V
gmax
.
The necessary control power is taken from the operating
pressure or the external control pressure applied to port Y
3
.
To ensure that control is guaranteed at a low operating
pressure of <40bar too, port Y
3
must be supplied with an
external control pressure of about 40bar.
Various BODAS controllers with application software and
amplifiers are available for controlling the proportional
solenoids.
Further information can also be found on the Internet at
www.boschrexroth.com/mobile-electronics.
Technical data, solenoid EP2
Voltage 24V (±20%)
Control current
Start of control 200mA
End of control 600mA
Current limit 0.77A
Nominal resistance (at 20°C) 22.7Ω
Dither frequency 100Hz
Duty cycle 100%
Type of protection: see connector version page 40
▼ Characteristic curve EP2 positive control
0 0.6 0.8 1.00.40.2
800
700
600
500
400
300
200
100
Displacement V
g
/ V
g max
Control current I [mA]
▼ Schematic EP2
R
2
U
R
1
V
g min
V
g max
T
1
X
3
Y
3
B(A)
A
1
M
1
S