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SECTION 1 |
to prevent permanent damage to the unit. Please observe the following
precautions:
• Ensure that the maximum charging voltage of the external battery
charger / alternator / solar charge controller is ≤ 16 vDC for the 12v
battery version and ≤ 32 vDC for the 24v battery version
• Do not use unregulated solar panels to charge the battery connected
to this unit. Under cold ambient temperatures, the output of the solar
panel may reach >22 vDC for 12v Battery System and > 44 vDC for
the 24v Battery system. Always use a charge controller between the
solar panel and the battery.
• Do not connect this unit to a battery system with a voltage higher
than the rated battery input voltage of the unit (e.g. do not connect
the 12v version of the unit to 24v battery system or the 24v version
to the 48v Battery System)
Preventing Reverse Polarity
on the Input Side
When making battery connections on the input side, make sure that
the polarity of battery connections is correct (Connect the Positive of
the battery to the Positive terminal of the unit and the Negative of the
battery to the Negative terminal of the unit). If the input is connected in
reverse polarity, DC fuse(s) in the input side will blow and may also cause
permanent damage to the inverter.
!
CAUTIon!
Damage caused by reverse polarity is
noT covered by warranty.
ATTENTION!
Des dégats causés par un renversement des polarités
n'est pas couverts par la garantie.
Using Generator as external Input Source
with Inverter Chargers
The AC output voltage of a generator is proportional to its rotational
speed (RPM – Revolutions Per Minute) and the current fed to its field
windings. The frequency of the AC output voltage produced by the
generator is proportional to the RPM of the engine and the number of
poles used in the generator. The RPM of the generator is controlled and
kept constant by the mechanical governor installed on the engine that is
driving the generator. The output voltage of the generator is controlled
by its electrical voltage regulator, which controls the current fed to its field
windings.
When an electrical load is applied to the generator, its output voltage
tends to drop and the speed of the engine also tends to drop leading to
drop in the output frequency and additional drop in the output voltage.
The drop in the RPM of the engine is countered by the engine governor
by feeding more fuel to the engine. The drop in voltage of the generator
is countered by the voltage regulator of the generator by increasing the
current fed to the field windings.
Safety Instructions
Similarly, when a load is removed from the generator, its output voltage
tends to rise and the RPM of the engine also tends to rise leading to
increase in the output frequency and additional increase in the output
voltage. The increase in the RPM of the engine is countered by the engine
governor by reducing the fuel supply to the engine. The rise in the output
voltage of the generator is countered by the voltage regulator of the
generator by decreasing the current fed to the field windings.
The mechanical governor and electrical voltage regulator have sensitivity
of producing controlling action to correct a deviation of the controlled
parameter. Higher sensitivity tends to produce oscillations around the
controlled value. Hence, when these devices try to control very fast
moving parameters, they will produce larger oscillations before settling
down. The voltage regulator will tend to produce high voltage transients
during this time. These symptoms are seen during the start up and
shut down of the engine-generator.
For 60 Hz frequency of AC voltage, the engine speeds should be
3600 RPM for 2 pole, 1800 RPM for 4 pole and 1200 RPM for 6
pole generators.
When a generator is started, it is cold and it starts from 0 RPM and
reaches the rated RPM within a finite time. Thus, during the initial period
of ramping up from 0 RPM to the rated RPM, its frequency and output
voltage will be fluctuating due to the regulating action of the mechanical
governor and the electrical voltage regulator. As this happens in a very
short duration, during this period, the output frequency will fluctuate and
the output voltage will also fluctuate and will contain a lot of high voltage
transients that are produced by the extremely fast regulating actions of
the mechanical governor and the voltage regulator. These voltage and
frequency fluctuations and high voltage transients can damage the AC
loads that are fed from the generator. Also, the engine needs some time
to warm up and stabilize in its mechanical operation. normally, the
engine- generator should be warmed up for at least 10 minutes
before loading the generator.
The same fluctuations in frequency and voltage and appearance of high
voltage transients will be seen at the output of the generator at the time
of shutting down the engine.
!
CAUTIon!
It is very important that all AC loads on the output of the generator
are switched on only after around 10 minutes of generator starting.
This ensures that the engine and generator have warmed up
sufficiently and that the generator is providing stable frequency
and well regulated, cleaner, transient-free output voltage to prevent
damage to the AC loads / Inverter Charger. Similarly, the AC loads
should be disconnected first, before the engine is shut down.
ATTENTION!
C'est vraiement important que toutes les charges CA qui sont
branchées au générateur sont mises en marche 10 minutes après
que le générateur a démarré. Cela permet que le moteur et le
générateur sotent bien réchauffés et que le générateur fourni
une fréquence stable et une tension de sortie sans transition, bien
reglé/propre qui empêche d'endommager les charges CA /le G4.
Sembablement, les charges CA devraient être déconnecter avant
que le moteur soit fermé.
SAMLEX AMERICA INC. | 7
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