Hot Alignment - Siemens 880 Installation Operation & Maintenance

Installation
Angular Alignment
Hold each shaft at maximum end float. Rotate both
shafts together, and measure between matching points
at the outside diameter of the coupling faces for the
top, bottom and both sides.
because of possible axial shaft movement.
difference of variation between them.
Align shafts so that the total indicator variation does
not exceed 0.002 inch. (See Figure 1.)
NOTE
If vibration levels increase cold to hot, alignment should
be checked hot to verify that motor and driven equipment
are properly aligned at operating temperature. Adjust if
necessary.
Figure 1. Diagrams Showing Parallel and
Angular Misalignment
Foot Plane
The proper foot plane exists when adequate shims
have been installed to assure equal pressure on each
foot or corner of motor when the mounting bolts are
loose.
To determine proper foot plane:
1. Mount dial indicator on shaft to be checked so that
contact will rest on either the adjacent shaft or a
bracket from the foundation or base.
2. With mounting bolts tight and indicator set at zero,
release one bolt at the shaft extension end of the
unit and check indicator for a maximum change
of 0.001 inch.
Use two indicators
Read
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3. If no change is indicated, retighten the bolt and
repeat the process for each of the remaining three
mounting bolts.
4. If a change is indicated, add shims under motor
foot and retighten until indicator movement is
reduced or eliminated.
NOTE
1. The foot plane is of concern for each unit of rotating
equipment. Check driven equipment if necessary.
2. Base or foundation rigidity can also affect vibration;
check for resonance in supporting structure.
3. Recheck alignment after any change in shims and
document alignment readings for warranty
information.
V-Belts
Check belt manufacturer's
maximum speed of sheaves and belts, minimum pitch
diameters, maximum allowable number of belts and
maximum sheave width.
When motor is ordered for V-belt drive, check motor
outline for motor manufacturer's limits on belt pull,
sheave distance from motor, and sheave diameter.
Use only matched-belt sets. V-grooves must be in line;
sheaves must be parallel and axially aligned. Belts
must enter and leave sheaves with no side bending.
For long bearing life, the belt tension is important;
consult belt manufacturer for proper tension to suit
drive. Protect belts from grease and oil. NEVER use
belt dressing.

Hot Alignment

It is possible for the motor shaft height to change
relative to the driven equipment and this should be
compensated for during the alignment procedure.
Heat from driven equipment can also cause horizontal
misalignment.
WARNING
Rotating parts.
Can cause serious injury.
Disconnect and lock out power before working on
equipment.
If motor application is abnormal (high temperature,
extreme vibration, etc.) consult the factory for special
instructions or additional information.
recommendations for