Job Sheet 3 – Electrical Pitch Hub Trainer Components · ... Electrical Pitch Hub Trainer...
Transcript of Job Sheet 3 – Electrical Pitch Hub Trainer Components · ... Electrical Pitch Hub Trainer...
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Job Sheet 3 – Electrical Pitch Hub Trainer Components
The Electrical Pitch Hub Training System (Figure 3-1) provides the materials necessary to
to manipulate the components of a wind turbine hub assembly that uses electrical blade pitch
item.
Figure 3-1. Electrical Hub Trainer.
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System Parts
Rotor blade: This is one of three blades that are controlled by the software. It allows the trainer
to show a working blade in a scale that represents an actual wind turbine blade pitch control
system (Figure 3-2). If a true rotor blade were present, it would extend from the back of the
trainer as depicted in Figure 3-3. For safety, the representative rotor blade is enclosed behind a
clear plastic panel that cannot be opened.
Figure 3-2. Hub Trainer Blade.
Rear ViewFront View
Figure 3-3. Depiction of Blade Secured to the Electrical Hub Trainer Back.
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Slewing bearing: This component, which can be found in a full-scale wind turbine rotor hub,
secures the rotor blade and allows it to pivot relative to the trainer (Figure 3-4). The slewing
bearing has internal teeth that enable a gear drive system to rotate, or slew, the bearing into the
required position.
Figure 3-4. Slewing Bearing.
Pinion gear: The pinion gear is mated to an electric motor and meshes with the slewing
bearing (Figure 3-5). Powered by the electric motor, the pinion gear transmits the torque
needed to slew the slewing bearing that pitches the rotor blade. The pinion gear is smaller and
has fewer teeth than the slewing bearing; therefore, it rotates faster than the slewing bearing
does during repositioning.
Figure 3-5. Pinion Gear.
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Servomotor:
provides the means to reposition the slewing bearing and related blade (Figure 3-6). It is a
specialized electrical motor that has a built-in encoder that provides motor position feedback
information to the motor drive. A computer or programmable logic controller can interpret these
control signals to precisely position the device the motor is hooked up to.
Figure 3-6. Servomotor.
Gearbox: A small planetary gearbox is attached to the trainer between the servomotor and
the pinion gear (Figure 3-7). It is a reduction gearbox with a ratio of 25 to 1. This converts the
normally high RPM output of the electric motor to a high-torque low RPM output.
Figure 3-7. Planetary Gearbox.
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Limit switches: Two mechanically actuated limit switches (Figure 3-8) are mounted around
bearing assembly, and help the controller determine if position limits are being exceeded while
under automatic control.
Figure 3-8. Limit Switch.
Shuttle: An adjustable shuttle is provided on the blade portion of the slewing bearing (Figure
3-9). The shuttle contacts and activates the appropriate limit switch, depending on its current
position.
Figure 3-9. Adjustable Shuttle.
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Human machine interface (HMI): The HMI is a touch screen that the controller uses to operate
and monitor the electrical pitch hub trainer (Figure 3-10). The HMI uses a supervisory control
and data acquisition system (SCADA) to provide control and data monitoring.
Figure 3-10. Human Machine Interface.
Main power switch: This component is used to turn the training system on and off as needed
(Figure 3-11). It also provides a mechanism to attach a padlock for lockout/tagout procedures.
Figure 3-11. Main Power Switch.
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Emergency-stop switch (ESS): The ESS allows the controller to turn off (remove power from)
all motors on the training system in an emergency situation (Figure 3-12). It can be reset by
rotating the switch knob counterclockwise until it pops out.
Figure 3-12. Emergency-stop Switch.
Start push-button switch: This green push-button switch is used to enable power to the
trainer after the Emergency-stop switch is enabled (Figure 3-13).
Figure 3-13. Reset Push-button Switch.
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Electrical panel: The electrical panel, or cabinet, houses the electrical supply, distribution, and
control functionality for the electrical pitch hub trainer behind a clear, locked door (Figure 3-14).
Figure 3-14. Electrical Cabinet.
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Circuit breaker: The circuit breaker is housed within the electrical panel and contains a
switch that opens (disconnects) the electrical circuit when a certain current (amperage) is
overcurrent is determined and addressed, the circuit can be reset to restore proper operation.
Figure 3-15. Circuit Breaker.
UPS power supply: The UPS backs up the direct AC current fed to the electrical hub trainer by
the wall cord (Figure 3-16).
Figure 3-16. UPS Backup Power Supply.
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UPS relay card: This provides an electrical interface for monitoring the UPS system and
battery status, and activating a self-diagnostic program (Figure 3-17).
Figure 3-17. Relay Card.
Motor starter protector: This is a type of circuit breaker, also called an overload relay, that
protects the electrical pitch hub trainer motor from overcurrent (Figure 3-18). It contains thermal
and magnetic trip mechanisms, as well as an adjustable trip set point.
Figure 3-18. Motor Starter Protector.
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Fuseholder: The fuseholder protects other devices on the trainer by holding fuses that have
overcurrent is determined and addressed, the burned out fuse must be replaced.
Figure 3-19. Fuseholder.
Contactors: Contactors are relays, or remote-controlled switches, that provide high-current
switching capabilities in electrical circuits (Figure 3-20). They also provide on/off control of the
electrical hub motor and emergency systems.
Figure 3-20. Contactors.
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Solid state relays: Solid state relays provide low-current switching capabilities in electrical
circuits, as well as on/off control of circuits and devices that are used in the fault insertion
system of the electrical pitch hub trainer (Figure 3-21).
Figure 3-21. Solid State Relays.
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Servomotor positioning drive: The servomotor positioning drive is an electronic module that
contains the power circuitry and positioning analysis circuitry needed to properly control and
position the servomotor (Figure 3-22). The servo control drive has its own status LED display,
as well as a basic interface.
Figure 3-22. Servomotor Positioning Drive.
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Modular universal controller: This is a control system that is made of a collection of modules,
functions (Figure 3-23). The heart of the controller is a computer processing unit (CPU) module;
however, the unit also contains signal modules for reading measurement instrumentation,
function modules for analog and digital input/output, and communication modules for bus-based
communication.
Figure 3-23. Modular Universal Controller.
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Media converter: The modular universal controller is coupled to a media converter that allows
for both Ethernet and optical communications to the controller (Figure 3-24). For easy access,
a pair of optical interface connectors are located on the outside of the electrical cabinet and are
optically coupled to the media converter inside the cabinet.
Figure 3-24. Media Converter.
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OBJECTIVES
In this job, you will identify and describe the function of the main components of the
electrical pitch hub trainer.
PROCEDURE
Use the information provided in the Information Sheet to respond to these questions.
Which of the following components is coupled to the servomotor and
gearbox, and transmits motor torque that pitches the rotor blade?
a. Slewing bearing
b. Motor drive
c. Transmission
d. Pinion
Which component is represented in the following graphic?
Which component is represented in the following graphic?
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Where is the component shown in the following graphic located on the
electrical pitch hub trainer? (You may refer to the trainer, if necessary.)
Which component backs up the direct AC current fed to the electrical
hub trainer by the wall cord?
Which component provides low-current switching capabilities in
electrical circuits and is used in the fault insertion system of the
electrical pitch hub trainer?
Which easily accessible component allows the controller to remove
power from all motors on the training system in an emergency situation?
Which device provides high-current switching capabilities in the
electrical circuits?
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Name: _________________________________ Date: _____________________
Instructor approval: ___________________________________________________
Which component helps determine whether position limits are exceeded
while under automatic control?
Which electrical component supports optical connectivity?