Siemens EF 79 Series Instructions d'exploitation télécharger pdf (Page 4)

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

Storage

If motors have to be stored before

installation, precautions should be taken to

prevent deterioration.

Environment

Depending on the site conditions it may

be necessary to create a suitable stores area

to hold the motor prior to installation.

Packing cases are not waterproof.

Motors should be stored in a dry, vibration

free and clean area at normal ambients

(–20°C to 40°C), unless other arrangements

have been agreed with Brook Crompton.

Where low temperature ambient storage is

anticipated, special precautions should be

taken with the type of grease, no plastic

parts etc. to ensure trouble free start-up.

Motors must be stored away from corrosive

or chemically damaging fumes.

Before placing motors into storage,

machined components should be carefully

inspected. Bearings and shafts are normally

covered with a corrosion resistive barrier. If

this coating is damaged it should be made

good. The component should be cleaned

and the protective coating reapplied.

Under no circumstances should rust be

merely covered over.

Drain holes

Motors provided with drain holes have drain

plugs provided loose in the terminal box up

to frame size 180, and fitted on frames size

200 and above. Position the drain holes at

the lowest point.

Bearings

To avoid static indentation the storage area

should be vibration free. If this is not

possible it is strongly recommended that the

motors be stood on thick blocks of rubber or

other soft material.

Shafts should be rotated by hand one

quarter of a revolution weekly.

Where the exposure to some vibration is

unavoidable the shaft should be locked in

position to avoid static indentation of the

bearings. Roller bearings may be fitted with

a shaft locking device. This should be kept in

place during storage.

Grease

Factory fitted bearings use a lithium based

grease with a recommended shelf life of two

years. If stored for a longer period, grease

may need to be replaced.*

Shielded bearings have a storage life of five

years and a further two years operational life

following installation.

* Wash all bearing parts with a non-

contaminating solvent. Lightly pack the

bearings with grease applying a 33% fill

by volume into the bearing and housings

Heaters

Where space heaters are fitted, and the

storage environment has wide humidity

and temperature variations, it is strongly

recommended they be energised.

Warnings should be placed on the

motors to make operatives aware of

the live heaters

Supplies are normally 220-240 volt

single phase, from a 380-415 volt three

phase supply. See terminal box lid for

details.

A low voltage DC supply could be used as

an alternative (see page 14).

Insulation resistance

During extended storage a three monthly

insulation test is recommended to avoid

possible lengthy drying out periods when

installing. Use a 500 volt d.c. Megger.

The insulation resistance between phases

and between the windings and the frame

should be checked.

The insulation resistance should be

maintained above 10 megohm.

If a lower reading is measured, use one of

the drying out methods recommended on

page 14 until an acceptable reading is

obtained. If heaters are fitted but not

energised, they should be used in future.

See also note on page 14.

Wound rotors

Ideally, wound rotor motor brushes should

not be in contact with the slip-rings during

storage as there is a risk of corrosion.

Brushes should either be lifted off the slip-

rings or stored separately. This may not be

possible with small motors (up to frame

W-DF180).

Installation

Work on hazardous area motors should

only be carried out by Brook Crompton

trained personnel or those trained to an

equivalent standard

Reference should be made to:

a constructional standards EN50014,

EN50018 (EEx d), EN50019 (EEx e),

BS 5000 Part 16

b the approval certificate

c codes of practice (BS 5345, IEC 79 Part

14)

All warning instructions and labels

must be observed and retained with the

motor

Health & Safety at Work etc Act 1974

It is essential equipment is installed,

earthed and guarded in accordance with

current legislation

Location

Motors must be installed with adequate

access for routine maintenance. A minimum

of 0.75m of working space around the motor

is recommended. Adequate space around

the motor, particularly at the fan inlet

(50mm), is also necessary to facilitate

airflow.

Where several motors are installed in close

proximity, care must be taken to ensure that

there is no recirculation of exhausted warm

air. Foundations must be solid, rigid and

level.

Mechanical

Drain holes

Prior to installation remove drain plugs

if fitted. If any water has accumulated, the

integrity of all gaskets, sealants etc. should

be checked. Drain plugs should be put back

into place after draining.

Alignment

When the application calls for direct

coupling, the shafts must be correctly

aligned in all three planes. Bad alignment

can be a major source of noise and

vibration.

Allowance must be made for shaft end-float

and thermal expansion in both axial and

vertical planes. It is preferable to use flexible

drive couplings.

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Siemens EF 79 Series Instructions d'exploitation Page 4

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