NOTE: Delete locking mechanism when not required.
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Enclosures shall be designed for the application and environment,
conforming to NEMA ICS 6, and provided with locking mechanisms which are
keyed alike.
2.18.2
Analog
Analog electrical indicating instruments shall be in accordance with ANSI
C39.1 with semiflush mounting. Switchgear, and control-room panel-mounted
instruments shall have 250 degree scales with an accuracy of not less than
1 percent. Unit-mounted instruments shall be the manufacturer's standard
with an accuracy of not less than 2 percent. The instrument's operating
temperature range shall be minus 20 to plus 65 degrees C minus 4 to plus
130 degrees F. Distorted generator output voltage waveform of a crest
factor less than 5 shall not affect metering accuracy for phase voltages,
hertz and amps.
2.18.3
Electronic
Electronic indicating instruments shall be true RMS indicating, 100 percent
solid state, microprocessor controlled to provide all specified functions.
Control, logic, and function devices shall be compatible as a system,
sealed, dust and water tight, and shall utilize modular components with
metal housings and digital instrumentation. An interface module shall be
provided to decode serial link data from the electronic panel and translate
alarm, fault and status conditions to set of relay contacts. Instrument
accuracy shall be not less than 2 percent for unit mounted devices and 1
percent for control room, panel mounted devices, throughout a temperature
range of minus 20 to plus 65 degrees C minus 4 to plus 130 degrees F. Data
display shall utilize LED or back lit LCD. Additionally, the display shall
provide indication of cycle programming and diagnostic codes for
troubleshooting. Numeral height shall be [13 mm 1/2 inch][_____].
2.18.4
Parameter Display
ammeter, frequency meter, and coolant temperature.
2.18.5
Exerciser
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NOTE: Delete the exerciser when it is not required.
Ensure that the exerciser is compatible with the
automatic transfer scheme. It is highly desirable
to utilize system loads for generator set exercise
loads and to exercise the complete standby system
periodically. Coordinate requirements with the
user. The designer shall ensure that the design
provides warning signs in areas where the engine
generator can start automatically.
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The exerciser shall be in accordance with Section 16410A AUTOMATIC TRANSFER
SWITCH AND BY-PASS/ISOLATION SWITCH.
SECTION 16264A
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