i04066150
Generator Lead (Round Cable)
- Check
(If Equipped)
SMCS Code: 4450-535
The generator set may have braided square
conductors or multiple round cables between the
generator and the breaker.
Illustration 116 g02223453
Round generator lead cables
Ensure that the generator output leads are routed out
of the generator in a manner that prevents the leads
from rubbing against metal objects. Visually inspect
the following areas for cracking and physical
damage:
• Stator output leads
• Protective sleeving
• Insulation
i01228480
Generator Load - Check
SMCS Code: 4450-535-LA
During normal operation, monitor the power factor
and monitor generator loading.
When a generator is installed or when a generator is
reconnected, ensure that the total current in any one
phase does not exceed the nameplate rating. Each
phase should carry the same load. This allows the
generator to work at the rated capacity. If one phase
current exceeds the nameplate amperage, an
electrical imbalance will occur. An electrical
imbalance can result in an electrical overload and an
electrical imbalance can result in overheating .
The power factor can be referred to as the efficiency
of the load. This can be expressed as the ratio of kVA
to actual kW. The power factor can be calculated by
dividing kW by kVA. Power factor is expressed as a
decimal. Power factor is used to mean the portion of
current that is supplied to a system that is doing
useful work. The portion of the current that is not
doing useful work is absorbed in maintaining the
magnetic field in motors. This current (reactive load)
can be maintained without engine power.
Electric sets normally have a low idle setting that is
higher than industrial engines. Low idle will be
approximately 66% of the full speed that is achieved
by 60 Hz units. This would be equal to 80% of the full
speed that is achieved by 50 Hz units.
Some electric sets are equipped with Woodward
governors and some electric sets are equipped with
Caterpillar electronic governors. These electric sets
have no low idle stop. On electric sets with
mechanical governors and natural gas electric sets,
the low idle is set at the factory. Adjustment of the low
idle on these machines should only be done by a
Caterpillar dealer.
Note: Operating the electric set at low idle speed for
an extended time will cause some voltage regulators
to shut off. The electric set must be completely shut
down and the electric set must be restarted. This will
allow the voltage regulator to again produce an
output.
136
SEBU7125-13
Maintenance Section
Generator Lead (Round Cable) - Check
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