Schneider Electric 58 TRX manual Application Information, 203

Class 8839 Econoflex™ AC Drives

Application Information

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 maximum continuous output current rating of the Econoflex. When the motor full load current does exceed 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 horsepower must be used to select 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 derating. 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 converts the fixed voltage 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.

09/2003

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