Operation; Removal - Rohm OVUSHH Instrucciones De Servicio

7. Magnetostrictive position sensors
The magnetostrictive positions sensors use different
magnetic mechanical effects for the monitoring of a
lenght or stroke. These types of position sensors are
supplied with analogue, digital or field bus terminals.
They don't wear and are maintenance free.
The controlling is carried out by measuring the body--
supersonic diffusion speed (torsion pulses). The output
signal type is analogue (0 -- 10 Volts).
The measuring accuracy is better than 0.1 mm and
these sensors supply safe and consistent settings.
Functional check:
A function test is usually recommendable after
operational readiness of the cylinder has been
achieved. A lower pressure (approx. 5 bar) should be
set on the hydraulic system for this purpose.
Stroke:
The strokes are now controlled with this low operating
pressure:
-- all hydraulic connections should be consecutively
subject to this hydraulic pressure.
-- Check the positions reached by the control discs.
Determine the causes of any dimensional or positional

4. Operation

The operating pressure amounts to maximally
50 bars and minimally 6 bars.
The maximum pressure indicated on the cylinder
housing is binding, even if it differs from above
value.
The exclusive operating medium to be used is oil.
The unclamping pressure must amount to at least
half the clamping pressure.
The maximum speed of the actuating cylinder is
engraved in the cylinder housing. This limit must
never be exceeded.
The cylinder may be actuated during rotation.
For operation, we recommend to use hydraulic oil
H--LP 32 DIN 51525 (32 Centistokes at 40 Degrees
Centigrade).
To prevent foreign matters from penetrating the hy-
draulic unit, a pressure filter with a fineness of 0.01
mm needs to be installed between pump and control
valve. Also refer to section "Safety notes" on
pages 11-12.

5. Removal

To remove the cylinder, reverse the installation precedure.
5.1 Shut off hydraulic pressure in all lines and comple-
tely relieve all lines from pressure.
5.2 Disconnect the chuck or other clamping device from
the draw elements. The chuck normally need not to
be removed.
5.3 Remove connecting and drain lines as well as the
anti-rotation lock.
5.4 Seal the connecting unions with caps.
5.5 Loosen cylinder flange fastening screws and pull
actuating cylinder, together with draw elements if
applicable, partially out of the spindle bore.
5.6 Disconnect draw-in element. If the space available
behind the machine is sufficient to accommodate
16
deviations from the drawing with regard to the control
discs and eliminate any differences immediately.
Stroke monitoring:
It is recommended that the stroke monitoring device for
switching the end positions of the clamping cylinder
pistons and monitoring clamping positions required for
safety reasons by the machine control be mounted and
adjusted at this opportunity. Mount on holders provided.
The stroke monitoring device required for this purpose
are usually of customer specification and thus not
included in the cylinder scope of delivery. See its
operating manual in this respect.
Venting the hydraulic connections:
All hydraulic connections fitted with a safety valve
should be vented during the function test. The venting
screws are opened consecutively by turning them once
or twice, but they should not be unscrewed completely.
Then the connection should be pressurized with low
pressure.
The venting screws are closed tightly again if a continu-
ous oil flow emerges here (not oil spume). Check tight-
ness under max. admissible pressure applied.
Details of the clamping travel monitoring device
other than the control disks must be provided by the
customer if required.
Maximum speed and maximum pressure may be
applied simultaneously and for an indefinite period
of time (continous duty)
The cylinder control system depends on the requi-
red functions of the clamping device and the control
system of the machine and must therefore be desi-
gned by the customer in accordance with the appli-
cable safety requirements (see Section 1, "Safety
instructions and guidelines for the use of power-
operated clamping devices").
If piston, seals of safety valves must be dismantled,
the complete cylinder should be removed from the
spindle and returned to our works for general over-
haul.
After having effected the general overhaul, the func-
tion of the cylinder is guaranteed again.
the cylinder complete with draw elements, the com-
plete assembly (cylinder + draw elements) may be
pulled out of the spindle bore. In that case, special
care must be taken to keep the complete assembly
horizontally suspended (by finding the centre of gra-
vity).
5.7 Remove the complete cylinder and place it on a
suitable, protective support. Remove draw elements
from spindle bore.
5.8 5.8 If piston, seals of safety valves must be dis-
mantled, the complete cylinder should be removed
from the spindle and returned to our works for gen-
eral overhaul.
After having effected the general overhaul, the func-
tion of the cylinder is guaranteed again.