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readings must be made with the dial button located
at the chalk mark. At least six readings are to be
performed.
A variation in the dial reading at different positions
of coupling rotation will indicate whether the
machine has to be raised, lowered, or moved to
either side to obtain alignment of the circular
concentric peripheral surfaces of the two coupling
halves within the specified tolerance.
Coupling Faces
A check of the separation of the coupling faces
must be made to establish correct alignment. The
separation between the faces of the coupling may
be checked with a dial indicator fastened to one
coupling half and a reference surface fastened to
the other coupling half. Mark the location of the dial
button on the reference surface and make all
readings with the indicator in this position.
Set the dial of the indicator to zero for the first
reading and use this as the reference. Be sure to
rotate both halves of the coupling the same
amount, aligning the bottom of the indicator and the
mark on the reference surface for each of six
readings. A variation of the readings at different
positions must not exceed 0.03 mm (0.001") and
will indicate how the machine has to be adjusted to
obtain correct alignment. After each adjustment of
the motor, repeat the above procedure to ensure
that the correct alignment and leveling have been
obtained.
Flexible Coupling
Units coupled through flexible couplings should be
aligned as accurately as possible. The two halves
must fall within 0.013 mm (0.002") on both the
circular concentric peripheral surfaces and
separation between faces. Although most flexible
couplings will withstand greater misalignment than
rigid couplings, extreme misalignment can cause
vibration possibly resulting in failure of the motor
bearings and/or shaft.
If the method shown in
Figure 4
alignment of the machines, correct alignment exists
when:
• The peripheries of the coupling halves are true
circles of the same diameter and the faces are
flat.
• The separation between the faces is held to
within the specified tolerance at all points and a
straight-edge lies squarely across the rims at
any point.
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Motor Size, Compliance, & Installation
EQP Global IEC Series Low-Voltage 50/60 Hz Metric Motor
Non-parallel faces will be indicated by a variation in
separation of the coupling halves as they are
rotated, and a difference in height of the coupling
halves will be indicated by the straight-edge and
feeler gauge test.
With the feet of the motor bolted into position and
the coupling halves correctly aligned, place
temporary bolts in two coupling holes for clamping
the halves together.
Measure the coupling alignment. Upon completion
of a successful test, insert and secure all of the
coupling bolts.
The preferred method of measuring coupling
alignment is with a dial indicator as shown in
4.
Clamp the dial indicator to the coupling as indicated
below to measure the circular concentric peripheral
surfaces of the coupling halves for parallel
alignment.
Also, as shown below, clamping a reference surface
to the opposite coupling half allows the dial
indicator to be used for measuring the separation of
the coupling halves for axial alignment.
Figure 4 . Dial Indicator.
Balance (Direct-Coupled Motors)
Toshiba motors are balanced at the factory to
standard commercial tolerances. Field
disassembly/assembly may result in unbalanced
is used to check
operation.
To correct this condition, disconnect the coupling
halves and rotate one shaft 90° with respect to the
other shaft. Re-connect the coupling and run the
motor. If the unbalance persists, repeat the
procedure until normal operation resumes.
If a chain, gear, V-belt, or flat belt drive is used on
the output shaft, perform a minimum sprocket
diameter check.
Figure
9
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