Instruction and Operating Manual
Overspeed Protector CTO-B45202
J.M. Voith SE & Co. KG │ Division Digital Ventures
• Power supply > 30 V (overvoltage triggering at 29.5V - 32V)
(this criterion is omitted for Article No. TCR.9186855001)
• Power supply < 18 V (under voltage at 16-18V)
(this criterion is omitted for Article No. TCR.9186855001)
• Trip simulation = partial stroke test - trip-stop valve
The "trip simulation" does not cause a real turbine trip but the internal release frequency
threshold is reduced for a short time whereas the CTO is released internally for this
time, and thus a tiny movement of the trip-stop cylinder can be seen. The internal
release is not signalled outwards and thus, no real shutdown is activated externally.
The trip simulation allows a functional test of the trip-stop valve during operation when the
turbine speed is greater than/equal to 23% (+0%, -10%) of the set trip frequency. Only then
the CTO can be released internally.
If a trip criterion causes a real turbine trip, the turbine speed has to fall below a reclosure
limit equivalent to max. 55% of the set trip frequency. Only then the CTO can be restarted.
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