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  • Using AC PWM Drives on Non-Standard Voltages and Frequencies
    Often, there may arise the need to apply an AC PWM drive1 to input voltages such as 200, 208, 380, 415 and possibly other levels, as well as input frequencies such as 50 Hz. The AC PWM regulator utilizes a switching power supply for control power that is sourced from a DC bus. This gives the unit
  • Incompatibility of Power Factor Correction Capacitors with AC PWM Drives
    factor as seen by the user's line. A bank of these oil-filled or dry type AC capacitors usually reside in a conspicuously placed metal enclosure nearby the motor. Beware of retrofitting any AC controllers (including VVI and CSI types) to existing induction motors! If the installation is not thoroughly
  • Braking and Regenerative Energy with AC Drives
    someplace. In the case of an AC PWM drive, that someplace is back to the DC bus (The DC bus is that portion of the drive after the rectifier section where DC power is collected and stored for use by the inverter section).
  • Jog Circuit for the SP500 Drive: Setup and Configuration
    The success of the SP500 as an AC PWM drive can largely be attributed to its ease of set-up and configuration. Unlike the newer AC drives, however, neither the keypad nor the terminal board offered a dedicated jog PB. Should the need arise, jog functionality can be achieved by the methods discussed
  • Reducing Adjustable Frequency Drive (AFD)-caused Harmonics at Partial Loads
    for pulse width modulated (PWM) AC adjustable frequency drives (AFDs).
  • Low-Energy Braking Kit with GV3000/SE - Set-Up, Configuration and Application Points
    The low energy snubber braking kits were originally introduced to enhance capabilities of the GP2000 General Purpose AC Drive. They also were a natural fit with the SP500 AC PWM Drive when that was introduced. What may not be so well established is the fact that they can be used with GV3000/SE
  • Understanding Electronic Motor Drives
    . Alternating positive and negative switches recreates the three-phase output. The longer the power device remains on, the higher the output voltage. The longer it is off, the lower the output frequency. The drive output is not an exact replica of the ac input sine waveform. Instead, it provides constant
  • Eliminating sensors from closed-loopcontrol
    . Here's how encoderless systems compare with more traditional motor-control methods. To operate efficiently, a conventional flux-vector PWM drive needs to know the rotor flux angle inside an ac-induction motor. A pulse encoder typically supplies information about rotor speed and angular position

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