ensure NFPA availability in the application size
range. Consult manufacturers for availability in
the application size range.
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The manufacturer shall provide one or more of the following methods to
assist engine starting.
2.10.6.1
Glow Plugs
Glow plugs shall be designed to provide sufficient heat for combustion of
fuel within the cylinders to guarantee starting at an ambient temperature
of -32 degrees C -25 degrees F.
2.10.6.2
Jacket-Coolant Heaters
A thermostatically controlled electric heater shall be mounted in the
engine coolant jacketing to automatically maintain the coolant within plus
or minus 3 degrees of the control temperature. The heater shall operate
independently of engine operation so that starting times are minimized.
The control temperature shall be the temperature recommended by the engine
manufacturer to meet the starting time specified.
2.11
GOVERNOR
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NOTE: Coordinate with paragraph Engine Generator
Parameter Schedule.
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Each engine shall be provided with a governor which maintains the frequency
within a bandwidth of the rated frequency, over a steady-state load range
of zero to 100% of rated output capacity. The governor shall be configured
for safe manual adjustment of the speed/frequency during operation of the
engine generator set, without special tools, from 90 to 110 % of the rated
speed/frequency, over a steady state load range of zero to 100% of rated
capacity. [Isochronous governors shall maintain the midpoint of the
frequency bandwidth at the same value for steady-state loads over the range
of zero to 100% of rated output capacity.] [Droop governors shall maintain
the midpoint of the frequency bandwidth linearly for steady-state loads
over the range of zero to 100% of rated output capacity, with 3% droop.]
2.12
GENERATOR
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NOTE: Armature and field winding insulation classes
are specified based on the allowable temperature
rise (the temperature in the windings above the
temperature of the air used to cool the windings).
See NEMA MG 1 for a discussion of the classes with
respect to size range, elevation, method of
measurement, and ambient temperature. Select the
class insulation for each application based on
operating conditions. Class F is considered
industry standard. If a different class is required
for different machines, specify the one for each
application in the parameter schedule for the
respective generator set.
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SECTION 16264A
Page 42
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