Baumuller b maXX 5000 Series - 7.10 Avoid bearing currents

Avoid bearing currents
Instruction handbook b maXX 5000
Document No.: 5.09021.16 Baumüller Nürnberg GmbH
138
of 328
7.10
Locking torque of the fixing screw:
Device Locking torque
Single axis unit BM5326, BM5327, BM5328 0.8 Nm
cable diameter 5 - 20 mm
sh
ielding clamp width 24 mm
Double axis unit BM5323, BM5325 0.8 Nm
cable diameter 3 - 14 mm
sh
ielding clamp width 17 mm
Single axis unit BM5334, BM5335,
BM537X, connection 2 x 16 mm²
1 Nm
cable diameter 5 - 28 mm
sh
ielding clamp width 31 mm
Double axis unit BM5331, BM5332, BM5333
Single axis unit BM537X, connection 50 mm² 1.5 bis 1.8 Nm
cable diameter 20 - 35 mm
sh
ielding clamp width 40 mm
7.10 Avoid bearing currents
NOTE
The pulsed output voltage of a converter cau
ses additional motor bearing currents.
Bearing currents cause localized
melting on ball race and rolling body as well as wear
of the lubricant. This leads to a reduced service life of the bearing.
Bearing currents depend on:
m Mo
tor speed
m Switc
hing frequency of the converter
m Gro
unding
Furthermore the height of the bea
ring currents depends on:
m the
applied bearing voltage
m th
e dielectric characteristic of the bearing lubrication
NOTE
The reduction of bearing currents requires the consideration of the whole speed-
variable drive system and its installation!
Baumüller supports you with on-site measurements and with development and imple-
mentation of suitable pr
eventative measures.