a.
Exciter and Rotating Rectifier Assembly:
Rectifiers shall be provided
with surge voltage protection.
[b.
Permanent Magnet Generator: Provide a voltage spike suppression
device for permanent magnet generator (PMG) excitation systems.]
c.
Voltage Regulator: Voltage regulator shall be solid state or digital,
automatic, three-phase sensing, volts per hertz type regulator.[
Regulator shall receive its input power from a PMG.] Voltage variation
for any 40 degree C change over the operating temperature range shall
be less than plus or minus 1.0 percent. Operating temperature shall be
minus 40 degree C to plus 70 degree C. Voltage adjust range shall be
plus to minus 5.0 percent of nominal. Inherent regulator features
shall include overexcitation shutdown.
[2.1.3.3
Electromagnetic Interference (EMI) Suppression
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NOTE: Include electromagnetic interference (EMI)
suppression for engine-generator set installations
in the proximity of sensitive electronic equipment.
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Provide as an integral part of the generator and excitation system, EMI
suppression complying with MIL-STD-461.
]2.2
ENGINE-GENERATOR SET AUXILIARY SYSTEMS AND EQUIPMENT
Provide auxiliary systems and equipment designed for continuous duty at 100
percent of the power rating of the engine-generator set as specified in the
paragraph entitled "Engine-Generator Set Ratings and Performance."
2.2.1
Vibration Isolation System
Install the subbase on vibration isolators that are secured to a suitable
concrete foundation. Provide isolators as recommended by the
engine-generator set and isolator manufacturers and provide integral or
external lateral support to limit lateral movement and overturning moments.
The isolation system shall reduce the vibration transmitted to the adjacent
floor slab to a maximum of 0.038 mm 0.0015 inch total amplitude throughout
the frequency range down to 65 Hz.
2.2.2
Exhaust System
Provide exhaust systems for each engine.
2.2.2.1
Exhaust Silencers
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NOTE: The normal values given in the table for
exhaust sound reduction are for installations in
residential applications. If the installation is in
a critical environment (such as a hospital), more
stringent criteria must be applied, including engine
noise dampening, and the attenuation values in the
table for critical class should be selected.
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A[ residential class][ critical class] silencer shall be provided for each
SECTION 16237N
Page 24
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