Product Description
12
HYDROKRAFT OPERATION MANUAL PVW 250+360
E-PUIO_II001-E April 2021 www.eaton.com
3.2.5 ST Control
The ST control operates a hydrostatic drive and works
without throttle losses within electrically adjustable limits.
This is done by controlling delivery flow with electrical
swashplate angle feedback (electric closed-loop control).
All control values are recorded as an electrical signal and
lead back to the control card. The proportional valve and
servo piston transform the output signal of the control
card to the desired setting. This results in a very precise
and dynamic control. Pressure and power limiter override
available on request. Hysteresis is approximately 1% of
end value.
ST-controlled pumps starts at max. displacement. They
can work with internal pilot oil supply only, but require a
min.operation pressure of >25 bar for operation. Below
this min. pressure value pump will automatically go on
max. displacement.
Circuit shown is just an example, other options available. For circuit of individual pumps please contact technical support.
Gauge port of pilot pressure G 1/4”
Connection with plug.
X1
...*
L3.1
B L3
L8 L5 ML
L1 L2
1
2
3
4
D1
D1
A
MA
A
A
P
P
P
T
T
T
B
Xp
B
A
Propotional
relief valve
35
86
45
115
258
Xp*
A
–
System port
B
–
Inlet port
L1, L2 –
Drain port
L3
–
Ventilation port for vertical
mounting
L3.1, L8 –
Air bleading port
L5
–
Oil filling plug
MA
–
Gauge port - system pressure
ML
–
Gauge port of case pressure
Xp
–
Gauge port of pilot pressure
1
–
Basic pump
2
–
Connection plate for ST-control
3
–
Adapter plate ST-control
4
–
Propotional control valve
