Making High-Voltage Wiring Connections on VFD68Bxx and VFD68Cxx Drives - PENN Controls - VFD68Bxx - VFD68Cxx - VFD68Dxx - Three‐Phase Motor Speed Controller - VFD68 Three‐Phase Variable Frequency Drive

VFD68 Variable Frequency Drives Technical Bulletin

Product name
VFD68 Three‐Phase Variable Frequency Drive
Document type
Technical Bulletin
Document revision
Revision date


  1. Loosen the screws on the front cover and remove the cover to access the low-voltage wiring (Figure 1).
    Figure 1. Loosen the Cover Screws and Remove the Front Cover

  2. Remove the high-voltage wiring cover at the bottom of the VFD68 drive (Figure 2).
    Figure 2. Remove the High-Voltage Wiring Cover

    Important: Use UL Listed copper, stranded wire with insulation rated at 75°C (167°F) for wiring in Step 3 and Step 4. See High-Voltage Wire Size and Maximum Wire Length.
  3. For supplied three-phase power, connect the high-voltage power supply to terminals R/L1, S/L2, and T/L3 on the drive (Figure 3).

    For supplied single-phase power, connect the high-voltage power supply to terminals L1 and L3 (Figure 3).

  4. Connect the motor wiring to high-voltage output terminals U, V, and W on the drive (Figure 3).
    Figure 3. High-Voltage Terminal Block Wiring

  5. Connect earth ground wiring to the earth ground terminals on the VFD68 drive and on the motor.
  6. Replace the high-voltage wiring cover.
    Note: When replacing the high-voltage cover, carefully space and position the leads through the vents or wire slots.