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ENERCON E-40 Operating Instructions
Page 59 of 96 bottom of the nacelle and the hatch beneath it, an opening is made through which material can be hauled up with the winch.
Persons standing on the tower platform, on the folding ladder or in the nacelle with the sliding grids open, always must be secured at least by a fall breaker.
The nacelle roof is provided with a hinged hatch above the main carrier which allows the maintenance personnel to have access to the wind sensor and (if the turbine features obstructions lighting) to the lamps.
The safety equipment provided in the nacelle includes in particular a first-aid kit, a carbon-dioxide fire extinguisher, an emergency stop button, which initiates an immediate shut-down of the turbine, and a bord telephone for the communication between nacelle and ground station / tower base (see figure 2 and figure 4 in chapter
2).
6.2 Description of important components in the rotor head
The rotor head includes all the components that belong to the rotating part of the generator and are supported by the main pin.
6.2.1 Slip ring casing
The slip ring casing is attached to the front end of the main pin. Via the slip ring casing the control and power lines of the rotor head are connected with the stationary part of the machine.
The slip ring casing also houses a speed sensor which supplies pulses for mesuring the current rotor speed to the pitch control unit.
6.2.2 Pitch control unit
The pitch control unit adjusts the angles of the rotor blades. Each pitch control motor is controlled via relays and is provided with its own control system and a separate standby power supply. Each of these three components is encapsulated in a small metal cabinet. To each rotor blade therefore three small metal cabinetes are assigned:
1 battery cabinet,
1 pitch control cabinet and
1 relay cabinet.
These cabinets are mounted on the rotating part of the generator near the blade connections. Also installed on the rotating part of the generator is the rotor subdistribution which distributes the voltage supplied via the slip ring casing. Information from or to the control cabinet in the tower base is transferred to the slip ring casing via the rotor sub-distribution by means of optocouplers. The pitch systems communicates via optical waveguides.
Apart from the above-mentioned elements, the entire pitch control system consists of the following components:
pitch control motor with flanged gearcabinet,
blade flange bearing (connection hub - blade adaptor) and
angle encoder with limit switches.
The nacelle (the machine house)
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