GE Industrial Control Systems GEEP-124-I Copyright 1997,1998 The General Electric Company, USA
17
GEEP-124-I Horizontal Induction Motor
WPI, Antifriction Bearing
7. Observe the temperature of windings
(Resistance Temperature Detectors (RTD’s) are provided
on all machines). In no case should the windings exceed
the sum of the rated rise on the nameplate plus the
maximum design ambient.
8. Determine that the amplitude of vibration is
not excessive (see the section entitled “Vibration” in this
publication). Misalignment should be the first item to
check if there is unacceptable vibration.
9. Verify that all accessories supplied with the
machine are functioning normally and are performing
consistent with the load on the machine and system.
10. Verify that all control and protective
devices are functioning normally and are performing
consistent with the load on the machine and system.
11. The machine should be operated and fully
observed for not less than two hours and should be free
of any problems before it is released for normal duty.
12. As stated earlier,
the machine must be
shut down immediately if any problem occurs
. Should
any problem occur, it source should be determined and
corrected, and then the initial test run should be
repeated.
Vibration
General Electric motors and generators, covered
by this Instruction Manual, are balanced at the factory,
in accordance with NEMA Standard MG 1-20.52 and
MG 1-20.53, to be within the following limits (unless
otherwise specified in the sales contract).
Speed (RPM)
Maximum Peak-to
Peak Amplitude
(Inches) on Bearing
Housing
Maximum
Velocity
Inches/sec, zero-
peak
3600
0.0005
.094
1800
0.0016
.15
1200
0.0024
.15
900 and below
0.0025
.12
Vibration amplitude measurements are made on
the bearing housing and are taken in the vertical,
horizontal and axial directions.
If the owner’s half coupling was sent to the
factory to be mounted onto the machine shaft extension,
the rotor is balanced with the half coupling installed.
Otherwise, the rotor is balanced with a half key (i.e., the
keyway is filled with a steel bar equal in length to the
key length shown on the outline and flush with the top
of the keyway). The shaft key furnished with the
machines of 1500 rpm and higher is a full-length, full
key with a three-inch long half key extension on one
end. To maintain factory balance, cut the key to length
as follows. See Fig. 2.
1. Measure the coupling hub length (H) and cut
the full key to length H by cutting the excess from the
full key end.
2. Cut the half key end so that the overall key
length equals the key length shown on the outline
drawing.
3. Full key must fill coupling/keyway. Half key
must fill shaft/keyway.
WARNING:
TO AVOID EXCESSIVE STRESSES
IN THE KEY, THE MAXIMUM LENGTH OF
THE HALF KEY SHOULD NOT EXCEED 3.0
INCHES.
FAILURE TO OBSERVE THIS PRECAUTION
MAY RESULT IN DAMAGE TO THE
EQUIPMENT, INJURY TO PERSONNEL, OR
BOTH.
Fig. 2. Key alignment
DLCGEEP-124-I/000, Approved, 2016-11-11, CampinasDM