34 Rockwell Automation Publication 20P-TD001K-EN-P - January 2021
PowerFlex DC Drive and Field Controller Technical Data
PowerFlex DC Drive Field Converter Connections
For only 575V or 690V AC input drives, a step-down transformer with the following specifications must be installed before the input to the
field control circuit (terminals U1, V1):
• For a 150V motor field, use a step-down transformer with a 230VAC secondary
• For a 300V motor field, use a step-down transformer with a 460VAC secondary
Also, If the rated voltage of the DC motor field is not compatible with the field DC output voltage of the drive, an external field control
transformer must be used. See the following example for transformer selection information.
Example: 10 Hp, 240V Armature, 17.2 A, 240V Field, 2.0 A motor
a. The field control transformer must have a 230V primary, a 460V secondary, and be single-phase, 60 Hz
b. kVA = 2 A x 460VAC x 1.5 = 1.38 kVA (1.5 kVA is closest)
In addition, the following configuration must be completed in the PowerFlex DC drive:
c. Control board DIP switch S14 must be set to select a value of 2 A.
d. Parameter 374 [Drv Fld Brdg Cur] must be programmed to match DIP switch S14 = “2.”
e. Parameter 280 [Nom Mtr Fld amps] must be programmed to the rated motor nameplate field current “2.”
Frames A and B Field Circuit Terminal Block Locations
Frame C Field Circuit Terminal Block Location
Drive Field Converter Terminal Designations
Terminal Description
U1, V1 Single-phase AC line input power to the field circuit.
C1, D1 DC output power to the motor field.
Bottom View of Frame A Top View of Frame B
230V/460V AC Input Frame C, Front View of Drive
575V/690V AC Input Frame C, Left Side of Drive
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