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Class 8998 Motor Control Centers
Sample Specifications
226
09/2003
© 2000–2003 Schneider Electric All Rights Reserved
c. An internal overtemperature trip shall be provided to detect cooling system failure or blockage. Upon
occurrence of an overtemperature trip, the cooling system fans shall continue running to provide a
rapid cool down.
d. Power for the cooling system shall be provided internal to the AC drive controller unit by use of a
control power transformer which includes two primary fuses and one secondary fuse (in the
non-ground secondary conductor).
2.05 Motor Data
a. The AC drive controller unit shall be sized to operate the following AC motor:
1. Motor horsepower:
[1, 2, 3, 5, 7.5,10,15, 20, 25, 30, 40, 50, 60, 75,100,125,150, 200, 250, 300, 350, 400, 450, 500]
2. Motor full-load amperage: [_____]
3. Motor rpm: [3600/3000] [1800/1500] [1200/1000] [900/750] [720/600] [600/500], 50/60 Hz
4. Motor voltage: [208, 230, 460]
5. Motor service factor: [1.0] [1.15] [1.25]
2.06 Application Data
a. The AC drive controller unit shall be sized to operate [a Variable Torque] [a Constant Torque]
[a Variable Torque, Low Noise] [a Constant Horsepower] [an Impact] load.
b. The speed range shall be from a minimum speed of 0.1 Hz to a maximum speed of 500 Hz.
2.07 Environmental Ratings
a. The AC drive controller unit shall be designed for operation in a [NEMA Type 12] [NEMA Type 1]
[NEMA Type 1 Gasketed] Motor Control Center enclosure specified elsewhere. The AC drive
controller unit shall meet IEC 60664-1 and NEMA ICS 1 Annex A.
b. The AC drive controller unit shall be designed to operate while mounted in a motor control center
structure with an ambient temperature from 0 to +40 °C (+32 to +104 °F).
c. The storage temperature range shall be –25 to +65 °C (–13 to +149 °F).
d. The maximum relative humidity shall be 93% at 40 °C (104 °F), non-condensing.
e. The AC drive controller unit shall be rated to operate at altitudes less than or equal to 1000 m
(3300 ft). Derating factors shall be applied above 1000 m (3300 ft) for the drive unit and MCC.
2.08 Electrical Ratings
a. The AC drive controller unit shall be designed to operate from an input voltage of [480] [240] [208]
Vac +/-10%.
b. The AC drive controller unit shall operate from an input voltage frequency range from 57 to 63 Hz.
c. The displacement power factor shall not be less than 0.98 lagging under any speed or load condition.
d. The efficiency of the AC inverter at 100% speed and load shall not be less than 97%.
e. [The variable torque overtorque capacity shall be 110% for one minute.] [The constant torque
overtorque capacity shall be 160% for one minute.]
f. The output carrier frequency of the AC inverter shall be selectable between 0.5 and 16 kHz
depending on inverter rating for low noise operation.
g. The AC inverter will be able to develop rated motor torque at 0.5 Hz (60 Hz base) in a Sensorless
Flux Vector mode using a standard induction motor without an encoder feedback signal.
h. All AC drive controller unit feeder equipment including conductors, lugs, disconnects, contactors,
and so forth shall be sized per NEC 430-2 for the AC drive input current rating. An impedance range
corresponding to a 22,000 to 100,000 A fault availability level shall be assumed. An AC drive input
current rating label shall be attached inside each enclosure to enable feeder sizing.