Voith 91868550, Instructions And Operating Manual

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Instruction and Operating Manual
Overspeed Protector CTO-B45202
2019 / 02
J.M. Voith SE & Co. KG │ Division Digital Ventures
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918 3626018864 en D – 74564 Crailsheim Version: 2.1
Fig.: 4
Disconnect the VRM from the hydraulic component B in order to get to the coding switch.
To do so, loosen the 4 screw nuts D (10 mm width across flats) and pull off the VRM from
the hydraulic component B.

In the course of the further procedure described, the pressure-tight and explosion-
protected enclosure of the VRM will be opened and explosion protection will no longer
be effective. Therefore, make sure in advance that there is no explosive atmosphere or
may form as long as cover C is not remounted and secured by the screws.
Unscrew the 4 Allan screws (5 mm width across flats) used to fix cover C (see Fig. 3) and
remove the cover. On account of the seal in cover C, it is not easy to move. It may
therefore be helpful to first turn the cover and then lift it using a screwdriver until some air
can get into the electronic compartment underneath. Then it will be easy to remove the
cover.

The cylindrical component (diameter 80 mm) and the bore (diameter 12 mm) of cover C
are part of the pressure-tight, explosion-protected enclosure and must not be damaged,
as well as the bore and cylinder sections of the magnet housing belonging to these
surfaces. Do not damage the anticorrosion protection of the relevant surfaces. In case
of damaged surfaces or incomplete anticorrosion protection, the explosion protection is
no longer granted and the overspeed protector has to be replaced.
Fig. 5 shows the top view onto the electronics installed underneath cover C with coding
switch SS1 and UF- and If-potentiometers.