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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 GENERATOR SETS
The alternators used in emergency gensets, according to
humidity degree of the site, should 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
The AG10 alternators are designed to withstand vibration
levels up to 20 mm/s (RMS), specific for AC generator
set, driven by reciprocating internal combustion engines,
according to ISO 8528-9 standard.
6.4.1
Vibration measuring
Motor
Figure 6.1: Vibration measuring points according to ISO 8528-9
standard
Key of Figure 6.1:
1, 2 – Top edge of the front extremity and top edge of the rear
extremity.
3, 4 – Front and rear extremity of the engine base
5, 6 – Alternator main bearing housing
7, 8 – Alternator base
38 l Installation, operation and maintenance manual – Synchronous Alternator – AG10 line - Horizontal
Check the vibration level of the alternator at the points
shown in Figure 6.1. If the measured values are above the
recommended levels, the causes should be investigated
and solve it.
It is recommended that an initial reading be done in the
first hours of the alternator operation and after a periodic
monitoring to identify the trend of vibration levels.
The maximum vibration to drive machine is defined in ISO
8528-9 standard.
6.5 BEARINGS
The temperature control in the bearing must be part of the
alternator routine maintenance.
The temperature can be controlled permanently with
thermometers placed on the bearings outside or with
embedded thermal elements (optional).
The alarm and trip temperatures for the bearings can be
adjusted respectively to 110 °C and 120 °C.
6.5.1
The shielded bearings (2RS) do not require relubrication.
These bearings should be replaced when they reach
20,000 hours of operation or 30 months, whichever
occurs first.
The lubricated bearings should be relubricated annually or
as the lubrication intervals informed in Table 6.1 whichever
occurs first.
Frame
250
280
315
Alternator
355
400
*Lubricated bearings
DE = Drive End
6.5.2
The bearings relubrication should always be made with
original grease, specified on the bearing nameplate and in
the documentation of the alternator.
The WEG AG10 Line alternators are provided with grease
POLIREX EM 103.
Lubrication
Table 6.1: Bearing data
lubrication
Bearing
Bearing
interval
side
type
(hours of
operation)
DE
6316 2RS-C3
NDE
6314 2RS-C3
DE
6318 2RS-C3
NDE
6315 2RS-C3
DE
6320 2RS-C3
NDE
6316 2RS-C3
DE
6322 C3 *
NDE
6318 2RS C3
DE
6326 C3 *
NDE
6319 C3 *
NDE = Non Drive End
Type and amount of grease
Grease qty.
(g)
-
-
-
-
-
-
-
-
-
-
-
-
4500
60
-
-
4500
81
4500
45
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