Sauer Danfoss 51 Series Service Manual page 9

Bent Axis Variable Displacement Motors
Functional Description (Continued)
Electrohydraulic 2-Position Control (Types
E1•E2 and F1•F2)
A 12 or 24 VDC solenoid valve, mounted on the multi-
function block, connects the end of the control valve
spool in the end cap with pilot pressure (provided by
the shuttle spool in the multi-function block) or with
the motor case. The control valve in the end cap is
biased by a threshold spring, and controls oil flow to
the ends of the servo piston. Servo pressure may be
supplied from an external source or internally by the
shuttle spool in the multi-function block. PCOR is
available with these controls.
With the E1 and E2 controls, energizing the solenoid
will cause the motor to shift to minimum displace-
ment. When the solenoid is not energized, the motor
is held at maximum displacement.
With the F1 and F2 controls, energizing the solenoid
causes the motor to shift to maximum displacement.
When the solenoid is not energized, the motor is held
at minimum displacement.
10 - 5
Fig. 10-11 - Series 51 Motor with E1•E2 or
F1•F2 Control
Fig. 10-12 - E1•E2 and F1•F2 Control
Components
M6
L2
A
A1
U4 (opt.)
B1
U5
(plug for
ext. servo
press.)
Servo
B
Pressure
internal
L1
Fig. 10-13 - E1•E2 and F1•F2 Control
Schematic
Series 51
M4 M3
M1
max.
disp.
T3
T2
E1•E2
T7,
T8 M9
T1
X3 (M5)
Servo press,
external
M2
M7
M8
F1•F2
51000012
51000013
51000014
9