User Manual

12
Stopping the D400
The D400 is a robust machine and can safely be left operating in most windspeeds.
However, where extreme storm force winds are forecast, it is prudent to stop the machine
and secure the rotor blades with a rope lashing.
The D400 can be stopped by gripping the tail and turning the machine out of the wind,
securing the blades once they have stopped rotating.
Braking Switch:
A braking switch can be fitted which provides a convenient aid to stopping the D400.
The switch should be a double throw ‘break before make’ type, rated at least at
40 amps. When operated, the switch disconnects the batteries from the D400
before short-circuiting the turbine.
The short circuit slows the rotor blades making it easier to turn the machine out of the wind
and to secure the blades.
Please note: the D400 utilises a purpose-designed, highly efficient,axial field ironless
alternator. This configuration delivers exceptional power outputs coupled with smooth, low
friction running. These attributes are retained to some extent when the braking switch is
applied, and in consequence the electro magnetic braking effect is not as marked as with
other machines of more conventional alternator design.
In certain conditions, the rotor can overcome the braking effect altogether, which
results in damagingly high currents being produced in the stator windings.
For this reason the braking switch should only be used to slow the unit prior to
manually stopping it. It is not a parking switch. If the machine is left to run with the
braking switch engaged, serious damage can occur to the generator.
PLEASE NOTE
The braking switch should only
be used to slow the unit prior to
manually stopping it and
securing the airblades with a
lashing.
If the machine is left in high winds
with the braking switch engaged,
serious damage can occur.