Construction; Mounting Designations; Drain Holes; Motor Bearings - Grundfos MG Series Installation And Operating Instructions Manual

5. Construction

5.1 Mounting designations

IEC 60034-7, Code I
Flange-mounted motor (tapped-hole flange)
IM B 14
IM V 18
Flange-mounted motor (free-hole flange)
IM B 5
IM V 1
Foot-mounted motor
IM B 3
Foot-mounted motor (tapped-hole flange)
IM B 34
Foot-mounted motor (free-hole flange)
IM B 35

5.2 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
Caution
class will change from IP55 to IP44.
4
5.2.1 Number of drain holes
IEC 60034-7, Code II
IM 3601
MG 71, 80
IM 3611
MG 90-132
IM 3001
IM 3011
MG 160, 180
IM 1001
1
2
3
IM 2101

5.3 Motor bearings

The motor bearing type is stated on the nameplate.
5.3.1 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
IM 2001
commissioning.
The lubricating intervals are stated on the nameplate with
mechanical data. For information about lubrication and
maintenance of bearings, see section

5.4 Balancing

The rotor is dynamically balanced. As standard, the rotor has
been balanced with a half key inserted (cylindrical shaft).
B 3
One drain hole closed
1
with a plug
Two drain holes closed
2
with plugs
Three drain holes
closed with plugs
The flange can be turned 90 ° and 180 ° to both sides.
The flange can be turned 180 °.
The flange can be turned 90 ° to both sides.
B 14, B 5,
B 34, B 35
One drain hole closed
1
with a plug
Three drain holes
2
closed with plugs
Four drain holes
3 3
closed with plugs
11.2 Motor bearings.