Electric Power Generation
Installation and maintenance
LSA 52.3 / LSA 53.2 / LSA 54.2
Industrial Range Alternators
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15
4. START-UP
4.1 ELECTRICAL START-UP INSPECTION
4.1.0 General information
Electrical connections (auxiliaries, safety and power lines)
must comply with the drawings provided.
Refer to Section 5 to get the concerned schematics.
DANGER:
Check that all safety equipment operates correctly.
4.1.1 Insulation of the winding
Isolation and polarisation index must be measured at start-
up and then as recommended in Chapter 5.1.0.
To measure the insulation (refer to chapter 5.10).
4.1.2 Electrical connections
The phases must be connected directly to the bars of the
machine (without spacers or washers, etc.).
Make sure that the lugs are sufficiently tightened.
CAUTION:
ALL CURRENT TRANSFORMERS MUST BE
CONNECTED BEFORE STARTING. IF A CURRENT
TRANSFORMER IS NOT USED, ITS OUTPUT MUST BE
SHORTED.
4.1.3 Parallel operation
4.1.3.1 Definition of parallel operation
• Between machines
Operation mode named by Leroy-Somer "1F".
At least two alternators are connected in parallel to supply
a load.
The automatic voltage regulator is in voltage regulation
mode.
A droop current transformer is necessary to share the
reactive load.
• With the mains
Operation mode named by Leroy-Somer "3F".
At least one alternator is connected in parallel with the
mains (Public electricity network).
The Automatic Voltage Regulator is in Power Factor
regulation mode.
4.1.3.2 Possibility of parallel operation
CAUTION:
PARALLEL OPERATION CAN ONLY BE USED FOR
ALTERNATOR ENGINEERED FOR SUCH OPERATION.
4.1.3.3 Parallel coupling
CAUTION:
A WRONG SYNCHRONIZATION CAN LEAD TO
SERIOUS DAMAGE(HIGH MECHANICAL
OVERTORQUE AND OVER CURRENT).
During synchronization the following values must not be
exceeded:
Max frequency shift: 0.1 Hz
Max phase offset: 10° (electrical angle)
Max voltage (phase - neutral) between machines:
(at phase offset =0) 5 % of the nominal
voltage
Leroy-Somer will not be considered as liable for any
damage in case of incorrect synchronisation, or mains
micro-interruption inducing a fault over the indicated limits.
4.2 MECHANICAL START-UP INSPECTION
4.2.0 General information
4.2.0.1 Alignment; attachment; drive motor
The installation must comply with the drive motor
manufacturer’s installation requirements (alignment,
mounting).
An arrow at the drive end, end shield, indicates the
direction of rotation.
4.2.0.2 Cooling
The air inlet and outlet must not be obstructed.
The cooling auxiliaries (water circulation in the cooler, etc)
must be operating.
4.2.0.3 Lubrication
Lubrication must be carried out in accordance with Chapter
5. Lubricant quantity and periodicity as per Section 1.
4.2.1 Starting roller-bearing machines
The bearings are pre-lubricated in the factory, but it is
necessary to re-lubricate them before they are put into
service in order to fill any gaps in the lubrication circuit and
to remove the storage grease.
CAUTION:
WHEN STARTING UP, LUBRICATE THE MACHINE
WITH THE AMOUNT OF GREASE INDICATED ON THE
NAMEPLATE WHILE IT IS IN OPERATION.
Record the temperature of the bearings during the initial
operating hours. Poor lubrication can cause abnormal
heating.
If the bearing hisses, lubricate it immediately. Some
bearings may make a clattering noise if they do not operate
at normal temperature. This may occur if the weather is
very cold or when the machine is operating under abnormal
temperature conditions (start-up phase, for example). The
bearings will become quieter after having reached their
normal operating temperature.
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