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© simatec ag Induction Heater IH 070/090 33
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5.8 Power level selection
When heating bearings with an induction heater, most of the heat will
be generated in the inner bearing race. The heat will then be transferred
through the bearing. It is therefore important that bearings with small inter-
nal clearance or slight preload are heated slowly. Slow heating ensures that
the bearing expands evenly, thereby preventing damage to the bearing.
The shape, weight, size, and internal clearances all affect the amount
of time required to heat a bearing. The large variety of bearing types
precludes the possibility of providing a specific power level setting for
each type. Instead, the following guidelines are provided:
• For sensitive bearings (including bearings with C1 or C2 internal
clearance) or bearings with brass cages, do not exceed 20%
power when using the small yoke, 40% power when using the
medium yoke, or 60% power when using the large yoke.
• When using the small yoke, never exceed 40% power.
• When using the medium yoke, never exceed 60% power.
6 Safety features
The IH 070/090 is equipped with the following safety features:
• Automatic overheating protection
• Automatic current control
• In the TEMP MODE the heater will switch off if the temperature
probe does not register a temperature increase of 1° every
15 seconds. To increase the interval to 30 seconds, press MODE
and DOWN at the same time.
• Additionally, the IH 090 is equipped with a main switch with
over-current circuit breaker.
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