10
6.
The purpose of this initial test with the regulator out of
the circuit is to detect any wiring mistakes without
exposing the unit to undue risk. Check all line to line
and line to neutral voltages for balanced voltage. If
voltages are balanced, shut down the set and reconnect
the regulator. If voltages are unbalanced, shut down
the equipment and check for improper wiring. If the
problem persists, consult the factory.
With the regulator de-energized, the residual voltage
should be 10 - 25% of rated value. It is recommended
that this residual voltage and driver RPM be recorded
for use as a future troubleshooting benchmark.
WARNING
THE FOLLOWING TEST MUST BE CONDUCTED BY
QUALIFIED ELECTRICAL PERSONNEL. LETHAL
VOLTAGE MAY BE PRESENT AT BOTH THE
GENERATOR AND VOLTAGE REGULATOR
TERMINALS DURING THIS PROCEDURE. CAUTION
MUST BE EXERCISED NOT TO COME INTO
PERSONAL CONTACT WITH LIVE TERMINALS,
LINKS, OR STUDS. SERIOUS INJURY OR DEATH
COULD RESULT.
7.
Start the set and adjust the terminal voltage to the
desired value by means of the regulator voltage
adjustment. If the regulator is equipped with a stability
adjustment, follow the instructions in the regulator
manual to adjust the stability. Again, check all line to
line and line to neutral voltages for balance. It is
recommended practice to record the no load excitation
(DC voltage to the exciter stator), generator terminal
voltage, and driver speed as a benchmark for future
troubleshooting.
8.
Close the main circuit breaker to the load.
9.
Monitor the generator output current to verify that it is at
or below nameplate value.
10.
Check generator speed (frequency) under load. Adjust
as necessary. (Refer to prime mover or governor
manuals)
SHUTDOWN PROCEDURE
There are no specific instructions for shutting down the
generator; however, several good practices should be
observed to prolong equipment life.
1.
It is advisable to disconnect all loads (open main circuit
breaker or disconnect) prior to shutdown. This is
especially important if loads can be damaged by low
voltage or low frequency conditions during generator
"coast down".
2.
Isolate all conditions that could apply voltage to the
generator terminals while the generator is at rest.
Failure to comply could result in personnel injury or
equipment damage.
3.
If the unit is equipped with space heaters, verify that the
heater circuit is energized.
MAINTENANCE
The following maintenance procedures should be followed to
ensure long equipment life and satisfactory performance.
Maintenance intervals will depend upon operating
conditions.
1.
Routinely check intake and exhaust air screens to
ensure that they are clean and free of debris. Clogged
intake air screens will reduce cooling air flow and result
in higher operating temperatures. This will reduce
generator life and may result in generator damage.
2.
All MagnaPLUS generators are equipped with double
shielded ball bearings lubricated for the life of the
bearing. Every 1,000 hours check the bearing(s) for
smooth, quiet operation. For continuous duty
generators, recommended practice is to replace the
bearing during major overhauls of the engine.
3.
Periodically inspect the unit for any buildup of
contamination (dirt, oil, etc.) on the windings. If the
wound components have become coated with heavy
concentrations of oil and grime, the unit should be
disassembled and thoroughly cleaned. This operation
is not one that can be accomplished effectively on site,
but rather one that should be conducted by an
authorized service center equipped with the appropriate
apparatus and solvents necessary to properly clean and
dry the generator.
WARNING
THE FOLLOWING TEST MUST BE CONDUCTED BY
QUALIFIED ELECTRICAL PERSONNEL. LETHAL
VOLTAGE MAY BE PRESENT AT BOTH THE
GENERATOR AND VOLTAGE REGULATOR
TERMINALS DURING THIS PROCEDURE. CAUTION
MUST BE EXERCISED NOT TO COME INTO
PERSONAL CONTACT WITH LIVE TERMINALS,
LINKS, OR STUDS. SERIOUS INJURY OR DEATH
COULD RESULT.
4.
Every 2,000 operating hours or in conjunction with
scheduled engine maintenance, check the DC no load
excitation voltage per item #7 in the startup procedure.
Compare this voltage with the value recorded during
initial startup. If this value of no load excitation voltage
is markedly higher than the bench mark reading, it is an
indication of problems in either the exciter, main field,
