Section 2
Installation & Operation
Installation & Operation 2
−
1
MN427
Overview
Installation should conform to the National Electrical Code as well as local codes and practices. When
other devices are coupled to the motor shaft, be sure to install protective devices to prevent future
accidents. Some protective devices include, coupling, belt guard, chain guard, shaft covers etc. These
protect against accidental contact with moving parts. Machinery that is accessible to personnel should
provide further protection in the form of guard rails, screening, warning signs etc.
RPM AC
t
Cooling Tower PM motors are high performance motors specifically designed for use with
adjustable frequency controllers. The basic design includes Class H insulation, 1.0 service factor, 40
C
ambient, continuous duty. Standard enclosure is totally enclosed air over (TEAO) with minimum
recommended air flow velocities provided by the application fan. Many modifications, and accessories are
available. Motors are permanent magnet rotor construction. Refer to the motor nameplate or the
performance data sheet for the rated air velocity.
Motors are designed exclusively for outdoor cooling tower environments. Rated air flow is required for
proper operation. Motors are designed to mount inside the cooling tower with the fan mounted directly to
the motor shaft.
Mechanical Installation
Caution:
Do not lift the motor and its driven load by the motor lifting hardware. The motor lifting hardware
is adequate for lifting only the motor. Disconnect the fan from the motor shaft before lifting the
motor.
Caution:
Do not lift the motor by the shaft. The motor is designed to drive a load but it is not intended to
have lifting forces and stresses applied to the motor shaft. Damage to the motor may result.
Caution:
If eye bolts are used for lifting a motor, be sure they are securely tightened. The lifting direction
should not exceed a 20
angle from the shank of the eye bolt or lifting lug. Excessive lifting
angles can cause damage.
After storage or after unpacking and inspection to see that all parts are in good condition, do the following:
1. Rotate the motor shaft by hand to be sure there are no obstructions to free rotation.
2. A motor that has been in storage for some time should be tested for moisture (dielectric withstand
insulation test) and relubricated (regreasable type) prior to being put into service.
3. A motor with roller bearings is shipped with a shaft block. After removing the shaft block, be sure to
replace any bolts used to hold the shaft block in place during shipment that are required in service.
Table 2
−
1 Tightening Torque
NEMA Frame
Hole Dia.
(Inch)
Bolt Size
& Thread
Torque lb
−
ft
for Bolt Grade
SAE 5
SAE 8
FL250Y
0.69
5/8
−
11
155
−
176 200
−
249
FL280Y
0.69
5/8
−
11
155
−
176 200
−
249
FL440Y
0.81
3/4
−
10
274
−
310 389
−
440
FL5800Y
1.06
7/8
−
9
434
−
486 616
−
689
Mounting Location
All RPM AC cooling tower motors are designed to be mounted vertical, shaft up, supported by the
opposite drive end bracket. Use appropriate hardware (not furnished).
The motor should be installed in a location compatible with the motor enclosure required air flow and
specific ambient.
The motor must be securely installed to a rigid foundation or mounting surface to minimize vibration and
maintain alignment between the motor and fan blades within the cooling tower walls. Failure to provide a
proper mounting surface may cause vibration, misalignment and bearing damage. All hold down bolts
must be the correct grade for the type of mounting and must be torqued to their recommended value.
Foundation caps and sole plates are designed to act as spacers for the equipment they support. If these
devices are used, be sure that they are evenly supported by the foundation or mounting surface.
When installation is complete and accurate alignment of the motor and fan is accomplished, the base
should be grouted to the foundation to maintain this alignment.
The standard motor base is designed for vertical mounting.
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