-contacting thermal switch unit
Installation and Operating Manual / Version 10 / 3626-011500
en / Protection Class
0: public / 2017-12-15
2.5 Interaction of BTS components
Instead of a blind screw, the switching element is screwed into the turbo coupling. The
initiator with mounting flange is mounted parallel with the turbo coupling axis and is
connected to the evaluator.
The coil inside the switching element is coupled inductively with the coil inside the
initiator if the switching element is located in front of the initiator head. When the
thermostatic switch is closed, energy is transmitted from the initiator to the switching
element. The oscillator is attenuated and has a lower current consumption.
If the coupling temperature exceeds the response temperature of switching element,
the thermostatic switch will interrupt the circuit in the switching element. The switching
element can no longer attenuate the oscillator in the initiator.
The evaluator recognizes the attenuation of initiator due to the initiator current con-
sumption.
If the turbo coupling with screwed in switching element rotates, then the switching ele-
ment will permanently pass the initiator, thus permanently creating attenuation pulses.
Thus, permanently attenuation pulses are generated. The output relay in the evaluator
is energized.
In case of excess temperature, these attenuation pulses are not given, i.e. the cutoff
frequency set on the evaluator is not reached. The evaluator recognizes the missing
pulses, the output relay is de-energized.
On startup of the turbo coupling, a start-up bypass time is set at the evaluator. As long
as the start-up bypass is active, the output relay remains energized.
After this set time, the speed of the turbo coupling with the switching element must
have exceeded the set cutoff frequency.
Risk of personal injuries and damage to property
Following the shutdown, the control system
has to be locked in a way that
prevents automatic re
-start.
Switch off the unit in which the turbo coupling is installed and secure the
switch against inadvertent switch-on.
For all work performed on the turbo coupling and BTS ensure that both the
drive motor and the driven machine have stopped running and that a re-
is absolutely impossible!
The coupling may only be restarted if the turbo coupling temperature is below
the maximum permissible temperature allowed when switching on the motor!
Chapter 2
Chapter 3.3.1
permissible
temperature
Operating manual
of turbo coupling
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