General Information 1-3
MN400
4.
If the motor must be mounted to a plate with the driven equipment such as pump, compressor etc.,
it may not be possible to lift the motor alone. For this case, the assembly should be lifted by a sling
around the mounting base. The entire assembly can be lifted as an assembly for installation.
Do not lift the assembly using the motor lugs or eye bolts provided. Lugs or eye bolts are designed to
lift motor only. If the load is unbalanced (as with couplings or additional attachments) additional slings
or other means must be used to prevent tipping. In any event, the load must be secure before lifting.
If the load is unbalanced (as with couplings or additional attachments) additional slings or other
means must be used to prevent tipping. In any event, the load must be secure before lifting.
Storage
Storage requirements for motors and generators that will not be placed in service for at least six months
from date of shipment.
Improper motor storage will result in seriously reduced reliability and failure. An electric motor that does
not experience regular usage while being exposed to normally humid atmospheric conditions is likely to
develop rust in the bearings or rust particles from surrounding surfaces may contaminate the bearings.
The electrical insulation may absorb an excessive amount of moisture leading to the motor winding
failure.
A wooden crate “shell” should be constructed to secure the motor during storage. This is similar to an
export box but the sides & top must be secured to the wooden base with lag bolts (not nailed as export
boxes are) to allow opening and reclosing many times without damage to the “shell”.
Minimum resistance of motor winding insulation is 5 Meg ohms or the calculated minimum, which ever is
greater. Minimum resistance is calculated as follows:
Rm = kV + 1
where:
(Rm is minimum resistance to ground in Meg
−
Ohms and
kV is rated nameplate voltage defined as Kilo
−
Volts.)
Example: For a 480VAC rated motor Rm =1.48 meg
−
ohms (use 5 M
Ω
).
For a 4160VAC rated motor Rm = 5.16 meg
−
ohms.
Preparation for Storage
1.
Some motors have a shipping brace attached to the shaft to prevent damage during transportation.
The shipping brace, if provided, must be removed and stored for future use. The brace must be
reinstalled to hold the shaft firmly in place against the bearing before the motor is moved.
2.
Store in a clean, dry, protected warehouse where control is maintained as follows:
a.
Shock or vibration must not exceed 2 mils maximum at 60 hertz, to prevent the bearings from
brinelling. If shock or vibration exceeds this limit vibration isolation pads must be used.
b.
Storage temperatures of 10
°
C (50
°
F) to 49
°
C (120
°
F) must be maintained.
c.
Relative humidity must not exceed 60%.
d.
Motor space heaters (when present) are to be connected and energized whenever there is a
possibility that the storage ambient conditions will reach the dew point. Space heaters are optional.
Note: Remove motor from containers when heaters are energized, reprotect if necessary.
3.
Measure and record the resistance of the winding insulation (dielectric withstand) every 30 days of
storage.
a.
If motor insulation resistance decreases below the minimum resistance, contact your Baldor
District office.
b.
Place new desiccant inside the vapor bag and re
−
seal by taping it closed.
c.
If a zipper
−
closing type bag is used instead of the heat
−
sealed type bag, zip the bag closed
instead of taping it. Be sure to place new desiccant inside bag after each monthly inspection.
d.
Place the shell over the motor and secure with lag bolts.
4.
Where motors are mounted to machinery, the mounting must be such that the drains and breathers
are fully operable and are at the lowest point of the motor. Vertical motors must be stored in the
vertical position. Storage environment must be maintained as stated in step 2.
Luggage Point STP ST18 Pre Treatment (Aqua-Screen (Andritz) Operation and Maintenance Manual) General
Q-Pulse Id: TMS579
Active: 13/12/2013
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