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VFD Series

The VFD603 Series have all the features of the original VFD Series with several enhancements. They include a rugged steel or plastic NEMA 4X enclosure, an isolated front end, minimum speed adjustment potentiometer (pot), output voltage doubling, DC injection braking, and automatic or manual restart when power is restored. The VFD603 Series accepts reference signals that are 0-5 VDC, 0-10 VDC or 4-20 mA without an additional isolation card. The DC injection braking feature comes with two additional calibration potentiometers (Braking Current and Braking Time) for easy set up. There is never a need to program the VFD603 Series. The dual voltage VFD603 Series has a “doubling” jumper that can be set to output 230 VAC to the motor when only 115 VAC is available. Another jumper selectable option is for choosing automatic or manual restarting. The features, fl exibility and compact size of the VFD603 Series make it the ideal choice for AC motor applications under 1.5 HP in adverse surroundings.


Contact the factory for volume pricing

Enclosure Maximum
Voltage (VAC)
Freq (Hz)
Output Power Range Braking Reversing Isolation
VFD643-4 NEMA 4X 4.0 115 / 230
50 / 60
0 - 230 60 1Φ / 3Φ 3/8 - 1 .28 - .75 No Yes 0 - 5, 0 - 10 VDC
4-20 mA



  • Isolated Logic: Allows floating or grounded 0 ± 5 VDC, 0 ± 10 VDC, or 4 - 20 mA signals
  • Doubler / Step-Down Mode: Doubles a 115 VAC input to a 230 VAC output.
  • 50/60 Hz Input: Output frequency of 60 Hz at rated output voltage, regardless of input frequency
  • Variety of Motors: Permanent Split Capacitor (PSC), Shaded Pole, Synchronous, and 3Φ Induction
  • Diagnostic LEDs: Power, Fault (Undervoltage, Overvoltage, 250% Current Limit Trip)
  • DC Injection Braking: Can be used for quicker braking

Technical Data

  • 1.05 Form Factor
  • 1% Base Speed Regulation
  • 100:1 Speed Range

Trim Pots

  • Minimum Speed
  • Maximum Speed
  • Acceleration
  • Deceleration
  • Slip Compensation
  • Voltage Boost
  • Current Limit
  • Brake Voltage
  • Brake Time-Out

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Quick Start Guide