Drive Programming
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      Using Brake Chopper or Regen on PowerFlex 7 Class

      How parameters need to be set for external brake unit on PowerFlex 700 or 750 Series

      PowerFlex 70/700

      Connect the leads of the chopper module to the drive’s DC + and DC - terminals. Disable the drive’s DC bus regulator by setting Parameter 161 [Bus Reg Mode A] to 0 [Disabled].

      Note: Frames A-D of the PowerFlex 70 do not have DC - terminals, so they cannot be used with chopper modules. See 507186 - Brake Choppers on a PowerFlex 70.

      PowerFlex 700S

      Connect the leads of the chopper module to the drive’s DC + and DC - terminals. Disable the drive’s DC bus regulator by setting Parameter 414 [Brake/Bus Cnfg] bit 03 [Bus Reg En] to 0 [False]. Also, set Parameter 128 [Regen Power Lim] to -2 for 200% regeneration.

      PowerFlex 750-Series

      Connect the leads of the chopper module to the drive’s DC + and DC - terminals. Disable the drive’s DC bus regulator by setting Parameter 372 [Bus Reg Mode A] to 0 [Disabled].

      To reference PowerFlex 750 series Frame 8 for brake choppers, see tech note: 618087-Connect External Dynamic Brake or Regen Unit PowerFlex 750 AC input Frame 8

      Guidance and useful information on connecting the braking chopper to the PowerFlex 700 drive can be found in the publications listed below: