FCM 300 Series
MG.03.B6.02 - VLT is a registered Danfoss trademark
24
■
Installation of the FC motor
FC motors must be installed with adequate access
for routine maintenance. A minimum of 0.75m of
working space around the motor is recommended.
Adequate space around the motor, particularly at
the fan inlet (50 mm), is also necessary to facilitate
airflow.
Where several FC motors are installed in close
proximity, care must be taken to ensure that there is
no recirculation of exhausted warm air. Foundations
must be solid, rigid and level.
Fitting pinions, pulleys and couplings.
These should be bored to our standard limits and
fitted on the shaft with a screwing motion. Attention
must be paid to correct guarding of all moving parts.
Tapping of fitments onto the FC motor
shaft, with a hammer or mallet, causes
bearing damage. This results in an
increase in bearing noise and a significant reduction
in bearing life.
Mechanical specifications
When the application calls for direct coupling,
the shafts must be correctly aligned in all three
planes. Bad alignment can be a major source of
noise and vibration.
Allowance must be made for shaft endfloat and
thermal expansion in both axial and vertical planes.
It is preferable to use flexible drive couplings.
■
Alignment
Maximum permissible external axial and radial loads in N
1
- standard ball bearings
Horizontal shaft
Vertical shaft
Load towards Load away
Shaft up
Shaft down
Frame
motor
from motor
load
load
load
load
size
Poles
Up
Down
Up
Down
Max. radial
2
80
2
275
441
481
245
294
432
638
4
373
549
569
343
392
520
785
90
2
412
638
598
294
373
520
824
4
540
765
716
402
471
628
903
100
2
853
853
932
932
814
814
1207
4
1010
1010
1118
1118
961
961
1393
112
2
853
853
932
932
814
814
1207
4
1010
1010
1118
1118
961
961
1393
132S
2
1059
1403
1570
952
1216
1305
1785
4
1265
1609
1825
1138
1472
1481
1972
132M
4
1256
1609
1854
1109
1501
1462
2040
1
All figures are based on Lna bearing life of 20,000 hours.
Lna = adjusted L10 life rating taking account of:-Reliability -Material improvements -Lubrication conditions
2
Max. permissible radial load at end of shaft (horizontal mounting).
