4.2 Drain holes
As standard, MG motors have drain holes in the drive end of the
stator housing.
If the motor is installed in a humid environment or in areas with high
air humidity, open the bottom drain hole. The drain holes enable the
escape of water which has entered the stator housing, for instance
through condensation.
If the drain plug is removed, the motor enclosure class will
change from IP55 to IP44.
4.2.1 Number of drain holes
B 3
B 14, B 5,
B 34, B 35
MG 71, 80
One drain hole closed
with a plug
One drain hole closed
with a plug
MG 90-132
Two drain holes closed
with plugs
Three drain holes
closed with plugs
MG 160, 180
Three drain holes
closed with plugs
Four drain holes closed
with plugs
1
The flange can be turned 90° and 180° to both sides.
2
The flange can be turned 180°.
3
The flange can be turned 90° to both sides.
4.3 Motor bearings
The motor bearing type is stated on the nameplate.
4.3.1 Motors with lubricating nipples
Frame size 160 and 180 motors have lubricating nipples both in the
drive end and the non-drive end. The bearings are lubricated from
factory and should therefore not be lubricated until commissioning.
The lubricating intervals are stated on the nameplate with
mechanical data. For information about lubrication and
maintenance of bearings, see the section about motor bearings.
Related information
4.4 Balancing
The rotor is dynamically balanced. As standard, the rotor has been
balanced with a half key inserted (cylindrical shaft).
4.5 Cable entry/screwed connection
Motors are supplied without screwed cable entries. The table below
shows the number and size of the cable entry holes of the terminal
box according to EN 50262.
Frame
size
Model
Number x di-
mensions
Description
71, 80
B, C, H
2 x (M20 x 1.5)
The holes have precast
threads and are closed
with knock-out cable en-
tries.
90, 100
B, C, D, H
4 x M20
The holes are closed
with knock-out cable en-
tries.
112, 132
C, D, F, H
4 x M25
160, 180
F, H
4 x M40
2 x M20
7
English (GB)
