Maintenance; Emergency Gensets; Cleaning; Noise - WEG G Serie Manual De Instalación, Operación Y Mantenimiento

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6

MAINTENANCE

Maintenance procedures should be followed to ensure the proper performance of equipment. The frequency of inspections
will depend essentially on local conditions of application and conditions of service.
Failure to comply with one of the items listed below can mean a reduction in the life of the alternator, unnecessary stops and
/ or damage to facilities.

6.1 EMERGENCY GENSETS

The alternators used in emergency gensets should,
according to humidity degree of the site, receive load of 2
to 3 hours each month.

6.2 CLEANING

The frame, multi-leaf dampers and deflecting grids must
be kept clean, without accumulation of oil or dust on the
outside to facilitate heat exchange with the environment.
Also inside the alternators must be kept clean and free of
dust, debris and oil. To clean them, you should use
brushes or clean cotton cloth. If dust is not abrasive, a jet
of compressed air must be used blowing the dirt from the
fan cover and eliminating any accumulation of dust
contained in the fan blades and frame.
Debris impregnated with oil or moisture can be cleaned
with cloth dipped in a suitable solvent.
The terminal box must have terminals clean, no rust, in
perfect mechanical condition and without deposits of
grease or verdigris.

6.3 NOISE

The noise must be observed at regular intervals 1-4
months. In case of anomaly the alternator must be
stopped and the cause must be investigated and solved.

6.4 VIBRATION

Maximum vibration level for the on-load alternator:
20mm/s (RMS).

6.5 BEARINGS

Temperature control in the bearing is also part of routine
maintenance of the alternators. The elevated temperature
must not exceed 60 °C, measured in the outer ring of the
bearing.
The temperature can be controlled permanently with
thermometers placed outside the frame or thermal
elements embedded (optional).
Temperature of alarm and shutdown for the bearings can
be adjusted respectively to 110 °C and 120 °C.
6.5.1

Lubrication

Shielded or sealed bearings do not allow relubrication.
These bearings must be replaced when reach 20,000
operating hours or 30 months, whichever occurs first.
Re-greasable bearings shall be relubricated annually or
according to the lubrication intervals reported in Table 6.1,
whichever occurs first.
38 l Installation, operation and maintenance manual – Synchronous Alternator – G line - Horizontal
Table 6.1: Bearing data
Frame Bearing Bearing
DE 6211 ZZ–C3 (*)
160
NDE 6209 ZZ–C3 (*)
DE 6313 ZZ–C3 (*)
200
NDE 6210 ZZ–C3 (*)
DE 6318 ZZ–C3 (*)
250
NDE 6214 ZZ–C3 (*)
DE 6320 ZZ–C3 (*)
315
NDE 6316 ZZ–C3 (*)
DE 6322-C3 (**)
355
NDE 6220-C3 (**)
DE 6324-C3 (**)
400
NDE 6226-C3 (**)
(*) – ZZ shielded bearings may be replaced by 2RS or
DDU sealed bearings.
(**) – Re-greasable bearings

Estimated useful life for re-greasable bearings = 40,000
h.

For other frame sizes, the bearing type and lubrication
interval are reported on a plate fixed on the alternator
frame.

6.5.1.1 Type and amount of grease

The relubrication of the bearings should always be made
with original grease, specified on the nameplate and in
the documentation of the bearings of the alternator.
The WEG alternators are provided with grease POLIREX
EM 103.
ATTENTION
1. WEG does not recommend the use of any
grease different from the original grease of the
alternator.
2. When the bearing is opened inject the fresh
grease through the grease nipple to eject the
old grease found in grease inlet tube and
applying new grease to the bearing, the inner
ring and outer ring by completing three
quarters of the voids.
3. Never clean the bearing with a cotton cloth as
it may release lint serving as a solid particle.
4. Proper lubrication is important, that is, the
grease applied correctly and in a suitable
quantity, for both a poor lubrication as
lubrication excessive bring the bearing
adverse effects.
5. Excessive lubrication entails temperature rise
due to the large resistance offered to the
movement of rotating parts and, mainly, due
to beating of grease, which ultimately
completely loses its characteristics of
lubrication.
Lubrication Grease
interval (hours amount
of operation) (g)
- -
- -
- -
- -
- -
- -
- -
- -
4.500 60
4.500 31
4.500 72
4.500 46
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