28 | Flameproof motors
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Figure 5-12 - Correct assembly of pulleys
ATTENTION
While mounting and dismounting a
pulley, never make pressure or knock
on the bearings.
EX ATMOSPHERE
INFORMATION
In case of belt couplings, belts can
not be affected electro statically.
RUNNING:
Avoid unnecessary thrusts on the
bearings by ensuring that the shafts are parallel
and the pulleys perfectly aligned (Figure 5-13).
Laterally misaligned pulleys, when running,
transmit alternating knocks to the rotor and can
damage the bearing housing. Belt slippage can be
avoided by applying a resin for this purpose.
Figure 5-13 - Correct pulley alignment
Belt tension is only required to avoid slippage
during operation (see Figure 5-14)
Figure 5-14 - Belt tension
Incorrect
Correct
Incorrect