Klockner Moeller Electric Parts from KlocknerMoeller.net
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All about Motors
Multi-speed contactor |
Certain operating sequences for multi-speed motors may be
necessary, or undesirable, depending on the nature of the
drive. If, for example, the starting temperature rise is to
be reduced or high inertia loads are to be accelerated, it
is advisable to switch to low speed first and then to high
speed.
It may be necessary to prevent switching from high to low
speed in order to avoid over synchronous braking. In other
cases, it should be possible to switch each speed on and off
directly. The operating sequence and indexing facilities of
rotary switches allow for these possibilities. Multi-speed
contactor starters can achieve these circuits by
interlocking with suitable control circuit devices.
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| Fuse protection of the overload
relay When a common fuse is used in the supply line, it must
not be larger than the back-up fuses specified on the rating plate of
either overload relay, otherwise each relay must be protected by its own
back-up fuse, as shown in the diagram.
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