Voith 91868550, Инструкция по эксплуатации и руководство пользователя

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Instruction and Operating Manual
Overspeed Protector CTO-B45202
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
Page: 17 / 25
918 3626018864 en D – 74564 Crailsheim Version: 2.1
Uf
If
SS1
ON
1 2 3 4 5 6 7 8 OFF
ON
8 7 6 5 4 3 2 1
VOITH
E528
Fig.: 5
Shifting the respective individual switch 1 - 8 of SS1 adjusts the required turbine trip
frequency whereas OFF position corresponds to 0 and ON position to 1.
The switch combination to be adjusted is an 8-bit binary number (finary number 0000 0000
to 1111 1111 = decimal number 0-255), calculated as follows, based on the required trip
frequency:
trip frequency
[
Hz
]
- 3800 Hz
Decimal number SS1 =
−−−−−−−−−−−−−−−−−−−−−−−−−−−
27.333 Hz
Convert this decimal number into a binary number and set it directly as switch combination
at SS1, whereas 1 = ON and 0 = OFF, and also set the least significant number on the
right at switch 1 and the most significant on the left at switch 8.
A more convenient method is to enter into Table 1 attached with the desired trip frequency
and to directly take from there the switch combination to be adjusted.

If you use the actual speed remove indication, readjust the 4 mA value using the If-
potentiometer for speed 0 after adjustment of the trip frequency. See Chapter 6.2, If-
potentiometer.
After setting the coding switches at SS1, remount cover C and fix it using the 4 Allan
screws. Make sure that the O-ring in the cover and the two small O-rings in the pole pipe
are mounted, not damaged and greased (see Fig. 1). Relock the 4 Allan screws using the
circlips.
Now push the VRM onto the hydraulic component, at the control housing of which the O-
ring between the hydraulic component and the VRM has to be mounted correctly.
After the overspeed protector is again ready for operation, a test of the readjusted trip
frequency is mandatory. On account of rounding errors and/or manufacturing tolerances, it
may be necessary to increase or reduce the binary number set by 2. Should this be the
case, please proceed again as outlined above. A trip frequency test has to be performed
and documented at any rate after completion of the settings. This test should be performed
in warm condition (CTO should be operated for about 30 min. at an oil temperature of
approx. 50 °C).
After that, seal the overspeed protector, thus securing the setting.
See section A-A of the outline drawing in Chapter 9, Annex.