Timken VHIN-G3-35 Manual De Instrucciones página 13

3. INTRODUCTION
3.1 Application
Timken induction heaters are intended for heating bearings, so they can be assembled easily by
means of a shrink fit. Subject to professional assessment, they can also be used to heat bushings,
cogwheels, couplings and metal objects that form a closed circuit. Bearings and workpieces are
demagnetised automatically after each heating cycle.
Bearings and workpieces can be heated to a maximum temperature of 240ºC (464°F).
Timken induction heaters are suitable for continuous use. However, when heating to 240°C
(464°F), don't do so for more than half an hour.
NOTE!
•
Bearings may be heated to a maximum of 120°C (248°F).
•
Precision bearings may be heated to a maximum of 70°C (158°F). Higher temperatures can
affect metallurgical structure and lubrication, resulting in instability and failure.
•
Do not use a heater for bearings and workpieces that are outside the minimum and maximum
dimensions specified in the technical specifications.
•
Never switch off the unit with the main switch while it is still heating up.
3.2 Operating conditions
•
Only use the device indoors.
•
Fit for use in an industrial environment, at an ambient temperature of 0ºC (32°F) to 50ºC
(120°F) and humidity of 5 to 90% – non-condensing.
At temperatures below 0°C (32°F), the unit stops operating.
3.3 Principle of operation
The operation of the heater is based on inducing a (low frequency)
current in the bearing. This is achieved by incorporating the bearing as a
secondary winding in a transformer.
The primary winding is connected to the mains by means of an
electronic controller. The magnetic field induces a high current (short-
circuit current) through the bearing, which then becomes hot. After each
heating cycle, the bearing or workpiece is demagnetised.
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