Installation instructions

GEI-M1011A
3. Examine the motor for loose objects or debris
which may have accumulated and remove any foreign
material.
4. If possible, turn the rotor by hand to be sure that
it rotates freely.
5. Check all connections with the connection
diagram. Check all accessible factory made connections for
tightness to make sure none has become loose during
shipment.
6. Check water cooling connections, flow and
temperature.
7. If possible, leave motor uncoupled (or uncouple
it) for initial operation so that motor vibration, noise,
current, and bearings can be checked uncoupled before
they are masked by the pump. To run a VHS motor
uncoupled, it is recommended that the pump head-shaft be
removed. If this cannot be done, remove the upper half-
coupling and be sure the pump shaft is well centered in the
motor shaft so it will not rub. IF THIS IS DONE,
ROTATE MOTOR BY HAND TO BE SURE THERE IS
NO INTERFERENCE BETWEEN SHAFTS. Do not try to
run motor uncoupled by just removing gib key.
8. When the driven machine is likely to be
damaged by the wrong direction of rotation, it is imperative
to uncouple the motor from its load during the initial start
and make certain that it rotates in the correct direction. If it
is necessary to change rotation, interchange any two line
leads. For multispeed motors, check each speed
independently. On VHS motors, do this before installing
pump head-shaft and upper half-coupling.
Some motors are designed for unidirectional rotation.
Rotation of these motors must be in accordance with the
rotation indicated on the nameplate and the outline
furnished with the equipment.
B. Initial Start
1. After inspecting the machine carefully as
outlined above, make the initial start by following the
regular sequence of starting operations in the control
instructions.
2. Run the motor uncoupled initially, if possible,
checking for abnormal noise, vibration, or bearing
temperatures and for current and voltage balance. Then
check motor operation under load for an initial period of at
least one hour to observe whether any unusual noise or
hotspots develop.
3. In the event of excessive vibration or unusual
noise, remove all power and disconnect the machine from
the load and check the mounting and alignment.
4. Space heaters should be de-energized during
motor operation.
5. Check line voltage on all three phases to be sure
it is balanced and within 10% of motor rated voltage with
motor drawing load current.
6. Check the operating current against the
nameplate value. Do not exceed the value of nameplate
amperes X service factor (if any) under steady continuous
load. Also, check to be sure that current in all three lines is
balanced.
C. Jogging and Repeat 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 job is much more than that
dissipated by the motor at full load. If it is
necessary to repeatedly start or jog a motor, it
is advisable to check the application with the
local general electric sales office.
Check motor heating but do not depend on your hand to
determine temperature. Use the temperature detectors
furnished in the motor if there are any (e.g., RTD’s or
thermocouples), or use a thermometer. If there is any doubt
about the safe operating temperature, take the temperature
of the part in question and confer with the nearest sales
office of the General Electric Company. Give full details,
including all nameplate information.
Overheating of the motor may be caused by improper
ventilation, excessive ambient temperature, dirty
conditions, excessive current due to overload, unbalanced
AC voltage, or (if a variable speed controller is used)
harmonics in power supplied to the motor.
V. MAINTENANCE
WARNING: Before initiating
maintenance procedures,
disconnect all power
sources to the motor and
accessories. For machines equipped with
surge capacitors, do not handle capacitor until
it is discharged by a conductor simultaneously
touching all terminals and leads, including
ground. This discharge conductor should be
insulated for handling. Replace all normal
grounding connections prior to operating.
Failure to observe these precautions may result
in injury to personnel.
A. General
Inspect the motor at regular intervals, as determined by
service conditions. Keep the motor clean and the
ventilation openings clear.
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