User manual

Motor modification set English
4. Operation overview
Locomotive decoders designed to control alternating current (a.c.)
motors are – in contrast to decoders for direct current (d.c.) motors –
not load regulated (except few versions). In order to control a.c. motors
with a load regulated decoder (for d.c. motors) you can exchange the
field coil for a permanent magnet, thus converting the a.c. motor into a
d.c. motor.
The motor modification set contains a permanent magnet, suitable for
use with one of the different motor types (large or small flat circle-
shaped commutator motor or drum-shaped commutator motor),
depending on the version (PM-1, PM-2 or PM-3). Note: With some
locomotive models rotors and engine plates have been mounted not
fitting to any of the three versions of the permanent magnet.
As a matter of principle interference voltages occur with all locomotive
motors transmitting the voltage from the turning rotator via brushes. In
order not to disturb broadcast and TV reception, factory-made there
are suppression devices mounted at the locomotive motor.
The interference voltages (the so-called "brush-sparking") rise with
increasing abrasion. They can disturb the data transfer to the
locomotive decoder (and thus affect the driving characteristics). It is
even possible that the emerging current-peaks damage components on
the decoder. For that reason it is generally recommended to mount
suppression devices in addition to those mounted by the locomotive
manufacturer when mounting a permanent magnet into a priority
locomotive model.
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