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B0059001 / Rev. 2.3
10
Maintenance
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10.1
Control unit SND40
In order to simplify a possible replacement of the unit, periodical data backup via network (see
"data backup via network" in chapter "technical information") or on USB stick (see "SND40 Store")
is required.
If new programs are created rarely, data backup can be performed at this moment.
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10.2
Sensors
During the progressing of use, the pole shoes and bearings of the sensor may face wearing and
damage. Thus, inspection in regular intervals contributes to long-term maintain the functionality of
the sensor. Normally a quarterly inspection interval is sufficient.
1. Inspecting the ball bearings: In new condition their diameter is 22 or 24 mm. When the
diameter has fallen short of 21.8 resp. 23.8 mm, a bearing should be replaced. Care must
be taken, that the diameters of the ball bearings do not differ among each other for more
than
± 0.1mm. If required, all bearings must be replaced.
Important: Uneven wearing at the bearings indicates a loose mounting or fault in
assembling. This results in uneven mechanical load. In any case, worn out bearings need
to be replaced.
2. Inspecting the pole shoes: Normally the pole shoes do not touch the tube. Anyhow,
contact can happen. Possible reasons are worn out bearings, weak mounting or uneven
weld seams. If pole shoes show visible wearing marks, the air gap between pole shoe and
tube surface can increase to an inadmissible size. Check whether this air gap is within the
permissible range. Larger air gaps reduce the magnetic flux and can drastically limit the
detecting capability of the sensor. If the air gap exceeds the permissible range, the pole
shoes need to be renovated.
The value ranges for the air gaps can be read from the technical data of the respective
sensor.
3. Inspecting the sensor element: Normally the sensor element does not touch the tube. If
wearing marks are sighted, the air gap needs to be inspected in any case, whether it is
within the permissible range. Besides that, the surface of the sensor may not be so deeply
grooved that the electronics lays open. In such a case the sensor element must be
replaced by the manufacturer.
The value ranges for the air gaps can be read from the technical data of the respective
sensor.
4. Inspecting the mountings: If rubber cushions are installed for elastic suspension of the
sensor, those must be inspected for damage. Sometimes a broken cushion can be already
noticed by skewness of the sensor. In any case, damaged rubber cushions need to be
replaced. Furthermore, all screws must be checked for tight seating and be tightened, if
required.
5. Inspecting the electrical components: Inspect cables, plugs and grounding line for
damage, correct layout and tight seating (plugs and screw terminals). Loose cables are
endangered to getting jammed or chaffed. Always replace damaged cables.
6. Inspecting movable parts: Due to the use of permanent magnets, metal particles can
cumulate at the sensor. In this case clean the sensor with compressed air.
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ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Weld Seam Detection System R4000 SND40
for Tubes, Cans and Drums
Manual
Maintenance
127
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