Power Level Selection; Safety Features - SKF TWIM 15 Mode D'emploi

6.5 Power level selection

The shape, weight, size and internal clearances, all
affect to the time required to heat up a bearing. The
large variety of bearings precludes the possibility of
providing a specific power level setting for each type.
Instead, the following guidelines are provided:
• In the case of shielded or sealed bearings with
metallic inserts, a LOW POWER mode must be
always selected. Light metallic rings can heat
up much faster than the rest of the component.
This might damage the bearing or the heater
itself due to too high temperatures.
• In the case of very small bearings, the power of
the TWIM 15 is automatically lowered.
If too fast heating is detected, a LOW POWER
mode must be selected. If the component
heats up faster than what can be read by the
temperature probe, the component might reach
temperatures above the desired level.
• In the case of the TWIM 15, heating bearings
with a tight internal clearance (C1 or C2) or
preloaded bearings is not an issue.
If a too high temperature difference is detected, a
LOW POWER mode must be selected. Slow heating
ensures that the bearing expands evenly, thereby
preventing damage to the bearing.
The low power modes can be selected by pressing
the LOW POWER button. The display will indicate
the power level selected.

7. Safety features

The TWIM 15 is equipped with the following safety
features:
•
Automatic overheating protection of the
heater. The heater has several internal
temperature sensors to protect itself. In case
that the temperature measured by one of them
is too high, measures are automatically taken to
stop this. For example, the heater might lower
the power or stop. In any case, the user must
monitor the process since too fast temperature
increases might not be detected on time.
•
Over current protection.
The heater has a built-in fuse.
•
Too hot surface warning.
A "hot" message in the screen will be shown
when the temperature of the surface of
the top plate will be above 60 °C (140 °F)
approximately.
•
Faulty temperature probe detection.
In Temperature Mode, the heater will give an
error and stop if no temperature increase is
detected.
N O T E :
To increase the time to error E05 by a 50%, press
the "Mode" and the "-" buttons simultaneously.
"t1.5" will be shown on the display briefly when this
is activated and "t1.0" when deactivated again.
This setting has to be chosen for every individual
heating job.
EN 11