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Allen-Bradley PowerFlex 70 Reference Manual

Allen-Bradley PowerFlex 70
300 pages
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Flying Start 2-99
Application Example
In some applications, such as large fans, wind or drafts may rotate the fan in
the reverse direction when the drive is stopped. If the drive were started in
the normal manner, its output would begin at zero Hz, acting as a brake to
bring the reverse rotating fan to a stop and then accelerating it in the correct
direction.
This operation can be very hard on the mechanics of the system including
fans, belts and other coupling devices.
Cooling Tower Fans
Draft/wind blows idle fans in reverse direction. Restart at zero damages
fans, breaks belts. Flying start alleviates the problem

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Allen-Bradley PowerFlex 70 Specifications

General IconGeneral
Input Voltage200-240V AC, 380-480V AC, 500-600V AC
Frequency Range0 - 400 Hz
Humidity5% to 95% non-condensing
Output Voltage0 to Input Voltage
Control MethodsSensorless Vector Control
CommunicationsEthernet/IP, DeviceNet, ControlNet
Protection FeaturesOvercurrent, Overvoltage, Undervoltage, Overtemperature, Ground Fault
Operating Temperature0°C to 50°C (32°F to 122°F)
Storage Temperature-40°C to 70°C (-40°F to 158°F)
Enclosure RatingIP20, NEMA Type 1

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