Siemens EF 79 Series Instruções de Operação descarregar pdf (Página 6)

103-4E Issue 2 Spare parts, installation and maintenance of ac electric induction motors

Control gear

Ensure all control gear and associated

metering/protection circuits have been

checked fully.

It is imperative that any overload trips

and emergency shutdown circuits are

working correctly before the motor is

energised. All covers must be in

position

Where a motor is fitted with a

separately driven fan unit, the

interlocks and thermal overload

protection circuits must be operative.

Connection diagrams

Refer to the connection diagram supplied

with the motor for supply details and the

required winding connection.

Rotation

Before coupling the motor to the drive, run

the motor briefly to check rotation.

All covers must be in place

Motors fitted with angular contact or

duplex bearings must be run in the correct

mounting position eg vertical.

To reverse rotation interchange any two

supply leads.

Wound rotors

The stator of a wound rotor motor is similar

to a cage motor but the rotor circuit is

connected to a starting resistance. Take

care to ensure that the brushes are in

contact with the slip rings and that the rotor

resistances are connected in the ‘start’

position.

Starting

Motors are rated by the output required,

the number of starts per hour, the load

curve/ inertia, and environmental

considerations.

Operating outside the contractual

parameters may thermally overload the

motor eg too many starts per hour, or

mechanically stress components eg

overspeeding.

Refer to starter literature for method

of start and safety precautions to be

taken

Running

After one hour of running, check the

general vibration levels. If these are

excessive, check alignment (and belt

tensioning if belt driven).

Some initial bearing noise may be present

during the running in period. This is normal

because the grease has to settle down

within the bearing. The noise should

disappear after a few hours of operation.

Check that the motor runs up smoothly and

within the permitted run-up time. Note that

repeated starting in quick succession may

lead to a thermal overload of the motor.

Motor modifications

W series

Multimount modification

Cast iron motors

Frames (200-355)

SAFETY WARNING

Do not work under suspended load

and use correct lifting equipment.

Changing terminal box

1 lift motor, using two lifting lugs provided

2 slacken the two vertical foot fixing bolts

on one foot

3 remove the two horizontal foot fixing

bolts

4 pull the foot away from the frame

5 repeat stages 2 to 4 on the other foot

6 lower the motor onto two pieces of

timber

7 remove both lifting lugs

8 rotate the motor until the terminal box is

in the correct postion

9 refit the two lugs on the machined pads

at the top of the motor on diagonally

opposite corners. Ensure that lifting lugs

are in contact with all machined faces

and that the correct bolts and nuts are

used. Tighten the bolts to the torque

shown on page 12

10 remove fan cover

11 remove the endshield bolts at both ends

of the motor

12 slacken drive end bearing cap or

clamping screws to allow endshield

spigot to disengage

13 disengage both endshield spigots and

rotate the endshields through 90

degrees until the grease nipples are at

the top

14 refit endshield bolts and tighten to

torque given on page 17

15 retighten the bearing cap screws at the

drive end, replacing the Nyltite washers

under the bolt heads. Tighten screws to

the torque given on page 17

16 lift motor, using hooks in the two lifting

lugs

17 strip paint from the pads where the feet

are to be fitted and apply a thin film of

grease for corrosion protection on bare

surfaces

18 slide first foot into position, using

vertical nuts and bolts for location

purposes. Lightly tighten to prevent foot

from falling out of the slots in the frame

19 insert horizontal bolts

20 ensure the feet are fully in contact with

the machined faces. Tighten all bolts to

the torque given on page 17

21 repeat stages 18 to 20 on the other foot

22 prime and paint all machined surfaces

left exposed by the changes

23 refit fan cover with the greasing hole in

the correct position

Bearings, grease, bearing change

Grease

Bearings are prepacked with a lithium or

lithium complex based grease.

Other lithium based greases of a similar

consistency would be compatible. See

Table 1 for some alternatives.

Where a special grease has been supplied

this will be indicated on the motor

nameplate.

Regreasing

Standard regreasing facilities, where

provided, are situated on the periphery of

the drive end and non drive endshields.

Grease relief is via a:

a diaphragm relief valve

b rotating grease relief flinger

c plugged grease chute

Energrease

Castrol

Luplex

Unirex

Sovereign

Mobilgrease

Liplex

Hytex

Retinax

LGHT3

Table 1

Alternative lithium complex greases

Grease

Castrol

Century

Esso

Gulf

Mobil

Shell

Texaco

Shell

SKF

Manufacturer

LC2

LMX

EP2

–

Reference

63/180*

200/355

Standard regreasing facilities

Type

on request

standard

Regreasing facility

* Bearings are double shielded and prepacked

with grease for life

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