GE I-M1010 Manual de instalación descargar pdf (Pagina 9)

GEI M1010-A

1. Dry the winding in an air-circulating oven with the air surrounding the winding at 110°C, +5/-15°C until

the part has been above 90°C for at least four hours. Then the air temperature may be raised to 150°C,

+5°C/-15°C. Continue to heat until the insulation resistance is constant for a one-half-hour period.

2. Enclose the motor with canvas or similar covering, leave a hole at the top for moisture to escape. Insert

heating units or lamps and leave them on until the insulation resistance is constant for a one-half hour

period.

3. With the rotor locked mechanically and using approximately 10% of rated voltage, pass a current

through the stator windings. Increase the current gradually until the winding temperature reaches 90°C.

Do not exceed this temperature. Maintain a temperature of 90°C until the insulation resistance becomes

constant for a one-half hour period.

B. Initial Start

WARNING: Be sure the motor is not running and the power supply is disconnected.

Do not flush out anti-friction bearings. The bearing grease supplied is sufficient for initial operation.

1. Whenever possible, examine the interior of the motor for loose objects or debris which may have

accumulated and remove any foreign material.

2. If possible, turn the rotor by hand to be sure that it rotates freely.

3. Check all connections with the connection diagram. Check all accessible factory made connections for

tightness to make sure none has become loose during shipment.

4. 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.

5. After inspecting the motor carefully, make the initial start by following the regular sequence of starting

operations in the motor starter control instructions.

6. 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.

7. 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.

8. In the event of excessive vibration or unusual noise disconnect the motor from the load and check the

mounting and alignment.

9. 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.

10. Space heaters should be de-energized during motor operation.

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GE I-M1010 Manual de instalación Pagina 9