Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 56)

56 Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
Chapter 1 Installation and Wiring
Field Converter Connections
For 575V or 690V AC input drives only, a step down transformer with either a
230 VAC secondary, for a 150V motor field, or 460 VAC, for a 300V motor field,
is required before the input to the field control circuit (terminals U1, V1).
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. Refer to the following example for transformer selection information.
Example: 10 Hp, 240V Armature, 17.2A, 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.”
Field Converter Terminal Designations
Table 13 - Frames A…C Field Circuit Wire Sizes and Terminal Specifications
Terminals Description
U1, V1 Single phase AC input to the field circuit
C1, D1 DC output to the motor field
Terminals Wire Size and Type
(1)
(1) See Cable and Wiring Recommendations on page 44 for more information.
Tightening Torque
N
•m (lb•in)
U1, V1, C1, D1 24…10 AWG/kcmils 0.5…0.8 (4.4…7.1)