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.