Servo Solenoid Valves Of Sizes 6 And 10 - Siemens SINUMERIK 840D Description Of Functions

A Hydraulics
A.1 Servo solenoid valves
A.1.2

Servo solenoid valves of sizes 6 and 10

Mechanical
construction
Size 6
7-pin connector
Reset spring Valve spool
Steel sleeve
Fig. A-14 Sizes 6 and 10 servo solenoid valves, directly actuated
A-242
SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
The standard series of size 6 and 10 servo solenoid valves shown in the follow-
ing diagram are designed according to the same principle.
The valve spool in its steel sleeve is pushed in contact with the reset spring by
the actuating solenoid. The armature axis of the solenoid is mechanically
coupled to the ferrite core of the position sensor integrated in the solenoid.
This sensor is a proximity-type, wear-resistant differential transformer ( LVDT).
The housing of the integrated valve amplifier (On Board Electronic OBE) is
bolted directly onto the solenoid/position sensor module.
Electrical power is supplied and the setpoint injected via a 7-pin connector.
If the valve is operating around the mid-position, the solenoid is energized by
about 50%. When the supply voltage is disconnected, the valve assumes a 4th
position, i.e. the "fail-safe position". On connection and disconnection of the
supply, it slides through the crossed position.
The valves are available with a variety of rated flows and two different fail-safe
positions.
Valve amplifier
Actuating
solenoid
Actuating
armature
solenoid coil
Size 10
A
P
A
P
LVDT coils
LVDT ferrite core
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02.99
Fail-safe enabled
B
T
Fail-safe disabled
B
T