Sauer Danfoss 51 Series Service Manual page 10

Bent Axis Variable Displacement Motors
Functional Description (Continued)
Fig. 10-14 - Series 51 Motor with S1 Control
Fig. 10-15 - S1 Control Components
M6
L2
A
A1
U4 (opt.)
B1
U5
(plug for
ext. servo
press.)
Servo
B
Pressure
internal
L1
Fig. 10-16 - S1 Control Schematic
10
51000162
51000163
M4 M3
M1
max.
disp.
T3
T2
S1
T7,
T8 M9
T1
X3 (M5)
Servo press,
external
M2
51000085
Electric 2-Position Control (Type S1)
A 12 VDC solenoid valve, mounted on the multi-
function block, directly operates the control valve
spool in the end cap. 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 this control.
With the S1 control, energizing the solenoid causes
the motor to shift to maximum displacement. When
the solenoid is not energized, the motor is held at
minimum displacement.
Series 51
10 - 6