Commissioning; Preliminary Test; Initial Spin; Operation - WEG G Serie Manual De Instalación, Operación Y Mantenimiento

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5

COMMISSIONING

 The alternator leaves the factory with a lock on the shaft or disc for better safety in transportation. Before putting it into
operation, this lock must be removed.
 The connection of the terminals comply with the nominal characteristics of the alternator plate.
To perform the adjustment of voltage and frequency, refer to the manual of the voltage regulator.


5.1 PRELIMINARY TEST

Before being given the initial start or after a long time
without operation, check:
1. If the alternator is clean and the packaging materials
and protective elements were removed from;
2. If the connection parts of the coupling are in perfect
condition and well-greased and tightened where
necessary;
3. If the alternator is aligned;
4. If the bearings are properly lubricated and in working
condition;
5. If the cables of the thermal protectors, grounding and
of the heaters are connected. (if any);
6. If the insulation resistance of the windings has the
prescribed value;
7. If all objects such as tools, measuring instruments and
alignment devices were removed from the alternator
work area;
8. If the alternator is well fixed;
9. If electrical connections are in accordance with the
wiring diagram alternator;
10. If the voltage regulator is properly connected and
adjusted according to its installation manual;
11. If the conductors of the grid are properly connected to
the main terminals as to prevent a short circuit or their
release;
12. If the alternator is properly grounded;
13. Manually rotate the set in order to ascertain if there is
no interference in the air-gap. Driven the alternator at
no load, it must rotate slightly and without strange
noises;
14. If the air inlets and outlets are clear;
15. If the measure "G" is in accordance with the
specification for the diesel engine to be coupled (for
single bearing alternators).

5.2 INITIAL SPIN

In addition to following the safety instructions, given in
chapter 2.2 of this manual, to put the alternator into
operation for the first time the following procedure must be
adopted:
a) Make sure that the alternator terminals are
disconnected from the load by removing the fuse
panel or circuit breaker or placement of the key in
b) position "off";
c) Turn off the space heaters of the alternator (if any),
before putting it into operation;
d) Disconnect the voltage regulator (removing the fuse in
series with the auxiliary coil);
e) Rotate the set and check for weird noises;
f) Activate the alternator to rated speed and check noise,
vibration and check all protective devices;
36 l Installation, operation and maintenance manual – Synchronous Alternator – G line - Horizontal

5.3 OPERATION

After following the procedures described previously:
a) Stop the alternator and connect the voltage regulator
(put the fuse in series with the auxiliary coil).
b) Activate the genset until it reaches the rated speed;
c) Make the necessary adjustments. The voltage
regulator manual describes the function of the
adjustable trimpots of the alternator electrical
quantities and the procedures for making these
adjustments.
d) Close the main circuit breaker and apply load and
monitor the voltage, current and frequency of the
alternator making sure that it is within the specified.
e) Check the vibration and temperature of the genset. If
there is significant variation in the vibration of the
genset between the initial condition and after thermal
stability, it is necessary to reassess the alignment /
leveling of the genset.
ATTENTION
All measuring instruments and control should
be under constant observation so that any
changes in operation can be detected and
remedied.

5.4 TRIMPOTS ADJUSTMENT

The trimpots of the voltage regulator are pre-set during
alternator testing at the factory.
After the factory tests, the U/F and Stb trimpots are
sealed, indicating that these quantities are preset.
If it is necessary to make new adjustments using these
trimpots, the voltage regulator manual must be consulted.
ATTENTION
The underfrequency protection of the voltage
regulator must be set in the U/F trimpot to
90% of the rated frequency (it is already set
at the factory).
Application 50 Hz Application 60HZ
10680382