INDUSTRY REPORT
(NDT) using penetrant dye or magnetic
particle inspection (MPI) before any
remedial work is completed. If any
cracks are found, they need to be
removed before any rebuilding of the
shaft is started.
Shafts can be repaired by sleeving,
spiral welding and metal spraying. If
metal spraying, then a bond test of
40 MPa is recommended. For some
specialist equipment, such as Ex motors,
bond testing is a requirement that is
outlined in the standard specific to
the equipment in question. It should
be noted that metal spraying is not
recommended for peripheral speeds
exceeding 90 m/s.
Repairs can also be made to bearing
seats, rebuilding them by metal spraying
or welding using MIG, TIG, Sub-arc
or hot wire processes and the seats
should be rebuilt to the manufacturer’s
tolerances. At the same time, any
replaced shafts should have the same
magnetic and mechanical properties as
the original, but peening the shafts to
improve the fit is not recommended.
Replacement bearings and any
grease should be in accordance with
the manufacturer’s recommendations.
These have potential implications for
rolling resistance and can impact on
efficiency figures. If insulated bearings
are installed, they should be tested and
the results recorded as part of the repair
file.Te s t i n g p r o c e d u r e s
Although the new standard does cover
test procedures, such as insulationresistance, surge comparison, voltage
withstand, phase balance, continuity,
brush neutrality, and commutator
concentricity the details are referenced
in their respective standards. These
have remained relatively unchanged
but repairers should be mindful to cross
reference between IEC 60034-23 and
the testing standards to ensure full
compliance. Test meters and equipment
should be calibrated and certified on a
regular basis.
For electric motors, there is a
requirement to carry out a no load
test and a locked rotor test to establish
vibration levels and calculate essential
data such as the power factor and
starting torque. Once again, as with so
many parts of this standard the details
are referenced to another standard, in
this case IEC 60034-1.
As the concept of the circular
economy gains greater popularity, so
companies that embrace standards
such as IEC 60034-23 will be able to
promote their active participation. This
has the potential to highlight not only
the professionalism of the company
for repairing rotating equipment, but
also demonstrate its commitment to
reducing waste and minimising the
consumption of resources.!Dr Martin Killeen is a technical specialist
at the AEMT (Association of Electrical
and Mechanical Trades).Control Engineering Europe http://www.controlengeurope.com March 2019 5
TE CONNECTIVITY INTRODUCES M8M12 CABLE ASSEMBLIES FOR SENSORS AND
ACTUATORS IN HARSH ENVIRONMENTS
TE Connectivity (TE) now offers M8M12 cable assemblies for applications such as
sensors, robotics and production equipment, where extreme temperatures and
harsh environments may be encountered. They are also ideal for non-industrial
applications where compact and reliable connections are required. They can be
installed quickly, helping to reduce unnecessary downtime and help maintain
continuous operation in critical areas.
The new M8M12 cable assemblies have a protection rating of IP67, making
them dustproof as well as waterproof down to 1m, while also providing protection
from other common industrial elements including EMI, chemicals and mechanical
stress. Designed as industry-standard solutions, these quick-turn cable assemblies
help to reduce unnecessary downtime and help maintain continuous operations in
critical industrial environments.
Customers can choose from single-ended or double-ended cable assemblies,
including M8M12 versions. M12 configurations are available with 2, 3, 4, 5 and 8
poles, while M8 configurations have 3 or 4 poles. Options include straight or an-
gled connectors and shielded and non-shielded variants. Cable sheathing is either
PVC or PUR. Standard cable lengths are 0.5, 1.0, 1.5, 3, 5, 7.0 and 10.0 meters,
while customized assemblies can also be produced with more specific cable lengths
and physical properties. The cable assemblies can be used in combination with TE’s
male/female connectors and I/O modules.Possible applications for the cable assemblies include industrial communications,
machinery, automation, machine tools, process control systems, vision systems and
general electronics manufacturing.
http://www.te.com
+49 6154 607 1740