Class 8839 Econoflex™ AC Drives
Application Information
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APPLICATION INFORMATION
When selecting and applying AC Drives, consider the following:
• AC drive selection
• Ambient temperature/altitude
• AC line and motor voltage
• Power factor
•Harmonics
• Input currents, with and without line reactors
• Drive isolation transformer
• Speed range and regulation
• Accelerating torque
• Follower signals
• Bypass operation
• Enclosure type
• Motor selection
AC Drive Selection
The Econoflex AC Drive Controller is selected based on the connected motor full load current. The
Econoflex is listed by horsepower, voltage and maximum continuous output current rating that align to
the latest NEC ratings. The motor horsepower rating may be used to select the Drive Controller,
provided that the full load current does not exceed the ma ximum contin uous ou tput curren t rati ng of the
Econoflex. When the motor full load current does exce ed the maximum continuous output rating of the
drive controller, select the next highest drive controller.
In multi-motor applications, the sum of the motor full load current, not horsepo wer must be used to s elect
the appropriate AC Drive.
Ambient Temperature/Altitude
Storage Temperatures for the Econoflex range from –25 to 65 °C (–13 to 149 °F).
The Econoflex Drive Controller is rated to operate in an ambient temperature of –10 to 40 °C (+14 to
104 °F). When ambient temperatures exceed 40 °C (104 °F), the drive controller and motor must be
derated. For installations that require a higher operating ambient, derate by one horsepower size to a
maximum of 50 °C (122 °F).
The Econoflex is rated for up to 3300 ft (1000 m) altitude without dera ting . Above these ratings, derate
current by 1% for each additional 330 ft (100 m). For conditions where altitude exceeds 6600 ft (2000
m), special considerations apply. Environment, application, loading and ambient operating conditions
could extend altitude range.
AC Line & Motor Voltage
The Econoflex Drive Controller is designed for operation under continuous rated input power from 208
V, 230 V and 460 V line voltages ±10% at 60 Hz.
Power Factor
The Econoflex Drive Controller uses diode bridge rectifiers that conv erts the fixed voltag e and frequency
from the AC line to a fixed DC bus voltage. Operation of the rectifiers does not cause any additional
displacement between the voltage and current on the AC line feeding the Drive Controller.
This means that the displacement power factor (power factor measured by the utility) will not be
degraded. Therefore, the AC drive power factor is rated 0.98 or better (lagging) at all times.