Skystream Owner’s Manual
3-CMLT-1054 Rev O XCO 1191
Pg. 28
Only then will it operate the DPDT Grid Relay RL_G to allow the inverter
to export power to the grid.
Refer to the Skystream Block Diagram in
Appendix A. Should the inverter sense an abnormal condition,
for example
high current in the alternator windings by means of the current sensors on
the relay board,
it will close relays RL1, 2, and 3 thereby stopping the turbine.
In turn, the DPDT Relay RL_G will be
operated to the position where the
inverter power exporting circuitry is disconnected from the grid.
Redundant Relay Switch Control
As a redundant measure of safety to guarantee stopping the turbine in case of a winding fault or a lost
connection to the alternator, there are seven connections to the alternator windings, but only three are
necessary to control or stop the turbine. And as a final measure of safety, if the inverter is unable to
control the rotational speed and Skystream exceeds approximately 400 rpm, the rectified voltage will
exceed the Zener (Z) voltage on the relay board, causing the latching relay (RL4) to open. This will
cause the relays RL1, 2, and 3 to close and apply all the available electromechanical torque to the
rotor, stopping Skystream completely. The inverter power path will also be disconnected from the grid
by means of relay RL_G. This is the final level of control and is only applied when all other methods of
control have failed. As such, once set, (latched) RL4 may only be reset by gaining internal access to
Skystream
– it cannot be reset via the Remote Display.
Warning:
Power to Skystream MUST BE TURNED OFF prior to servicing.
Disposal of Skystream
This symbol shown on Skystream or its packaging indicates it may not be treated as
household waste. Dispose of Skystream properly by handing the entire turbine
assembly over to the applicable collection point for recycling of electrical equipment.
By ensuring Skystream is disposed of correctly, you will help prevent harm to the
environment, which may be caused by inappropriate disposal of this product. The
recycling of materials will help conserve natural resources. For more detailed
information about recycling of Skystream, please contact your local waste disposal authorities, your
household waste disposal service or the store where you purchased Skystream.
Skystream was manufactured in compliance with the Restriction of Certain Hazardous Substances in
Electrical and Electronic Equipment 2002/95/EC (RoHS) and therefore does not contain any of the
materials regulated by that standard.
