2-4 Installation & Operation
MN605
Blower Ventilation System
Before loading a force-ventilated motor, be sure that the blowers, cooling fans, or central air supply
systems are operating properly to supply cooling air to the motor. Air filters should also be in place. If you
energize the main fields with the motor at standstill, the blowers or external cooling systems must be left
on. This will prevent excessive heat buildup that will decrease the life of the insulation.
When using field economy circuits to reduce the voltage to the main fields during standstill, blowers do
not need to be left on.
Blower motors should be checked for correct rotation. Don’t rely on feeling airflow from the drive end of
the motor. Look at the outline drawing or rotation arrow shown on the blower housing. Refer to Figure
2-1.
Figure 2-1 View from Air Inlet (Motor is on Opposite Side)
Air Inlet
Housing
Impeller
Blades
Airflow
Table 2
−
4 Electrical Data - Forced Ventilation Blower Units
Size
Motor Frame
HP
RPM
Volts
Phase
Hz
Amps
LM2
180
1/40
3000
230
1
60
0.4
LM3
180
1/8
3450
115/230
1
50/60
2.6/1.3
LM3
210-250
1/8
3450
208-230/460
3
50/60
0.66-0.60/0.30
LM4
280
1/3
3450
208-230/460
3
50/60
1.5-1.4/0.7
LM6
320-400
1
3450
208-230/460
3
50/60
3.1-3.0/1.5
LM8
504-506
3/4
1750
208-230/460
3
50/60
3.4-3.2/1.6
LM9
508-5012
3
3450
208-230/460
3
50/60
8.2-7.6/3.8
Note: Motor mounted blower units. Mount on commutator end (opposite drive end of motor. We supply
blowers that are powered by totally enclosed motors (standard). Blowers have a cast aluminum fan
housing with washable, wire mesh filters.
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