BEGA BETEX 22 ELDi, User Manual

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2. Introduction
2.1 Application
Bega Induction Heaters are designed to heat bearings, bushings, gear wheels, couplings or other
metallic work pieces which form a closed electrical loop. This will facilitate mounting where an
interference fit is required.
The heaters are designed to heat the work piece up to a maximum temperature of 240ºC (464ºF), with
the exception of the 22 ELD series models where the temperature is limited to a maximum of 150ºC
(302ºF) and special custom-designed heaters where the maximum temperature can be as high as
480ºC (896ºF).
Bega Induction heaters can be used on continuous bases. There is however a limitation; do not
operate heater at a temperature of 240°C (464°F) or more for more than half an hour. By heating with
the time function this has to be checked with an external temperature meter.
Caution:

Bearings generally should only be heated up to a maximum temperature of 120ºC (248ºF).

Precision bearings should only be heated up to a maximum temperature of 70ºC (158ºF). Heating
to higher temperatures may affect the metallurgical structure and dimensional stability resulting in
premature bearing failure or loss of bearing performance.

Do not use induction heaters for bearings or work pieces, which are outside the minimum, or
maximum dimensions as specified in the technical data (Appendix 1).

Do not switch off the heater with the main switch while heating cycle is running
2.2 Operating conditions
Designed to be used in an industrial environment with an ambient temperature of 0ºC to 50ºC (32ºF to
122ºF), and an atmospheric humidity of between 5% to 90%. The induction heater is meant for indoor
use only.
2.3 Principle of operation
The heater works in the same way as a transformer. The primary coil is the
heater and the secondary coil is the work piece.
When the heater is switched on, a high voltage, low alternating current passes
through the numerous windings of the primary coil. This induces a low voltage,
high current in the work piece acting as the secondary coil. This high current
results in the heating up of the work piece.
The current is only flowing in the work piece, hence it is only this which starts to
heat up. The work piece is automatically demagnetised at the end of each heating cycle.
In the Turbo models, the coil is located in the round pole. When the job is placed around this pole, the
magnetic field does not need to be transported, which results in a shorter heating cycle.