GEI 56128-L
© Copyright 2016 General Electric Company
9
3.
If possible, turn the rotor by hand to be sure that it rotates freely.
4.
Check all connections with the connection diagram. Check all accessible factory made connections for
tightness to make sure none has become loose during shipment.
5.
When the driven load is likely to be damaged by the wrong direction of rotation, it is best to uncouple the
motor from its load during the initial start and make certain it rotates in the correct direction. If it is
necessary to change rotation, interchange any two line leads.
Some motors are designed for unidirectional rotation. Rotation of these motors must be in accordance
with the rotation indicated on the motor’s nameplate and the outline furnished with the equipment.
Connection plates on the motor have been furnished to assist in obtaining the proper rotation.
6.
After inspecting the motor carefully, make the initial start by following the regular sequence of starting
operations in the motor starter control instructions.
7.
For sleeve-bearing machines, after starting verify that the oil rings are operating properly and that oil is
being fed to the shaft.
The temperature of the sleeve bearings, as measured by bearing temperature detectors, should not
exceed 93
C (200
F).
At initial start, the rate of rise of the bearing temperature is more indicative of trouble than is total
temperature. When starting a machine for the first time, the bearing temperature should be observed for
a minimum of 2 hours. If at any time the rate of temperature rise exceeds 2
C/minute, shut down the
motor immediately and make an investigation of lineup conditions, and if necessary, the bearing and oil
ring assembly.
8.
For anti-friction bearings check motor operation under load for an initial period of at least one hour to
observe whether any unusual noise or hot spots develop.
9.
In the event of excessive vibration or unusual noise disconnect the motor from the load and check the
mounting and alignment.
10.
Check the operating current against the nameplate value. Do not exceed the value of nameplate current
multiplied by the motor service factor (if any) under steady continuous load.
11.
Space heaters should be de-energized during motor operation.
C.
Jogging and Repeated Starts
CAUTION
:
Repeated starts and/or jogs of induction motors greatly reduce the life of the winding
insulation.
The heat produced by each acceleration or jog is much more than that dissipated by the
motor under full load. If it is necessary to repeatedly start or jog a motor, it is advisable to check the
application with the local GE Energy sales office.
V.
MAINTENANCE
WARNING
:
Before initiating maintenance procedures, disconnect all power sources to the motor
and accessories. For motors equipped with surge capacitors, do not handle the capacitors until
they are discharged by a conductor simultaneously touching all terminals
and leads, including earth. This discharge conductor should be insulated for handling. Replace all normal
grounding connections prior to operating
.
