Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 331)

Component Definition and Maintenance 5-89
7000 “A” Frame 7000A-RM001A-EN-P – January 2011
Operation at +5V does not allow for long cable lengths. The reason for
this is that it requires the power to be regulated within 5% at the encoder.
Due to the resistance and capacitance of the cable it would be very hard to
keep the power regulated at the encoder to 4.75V. With longer runs of
cable this could drop below the 4.75V and the encoder would not operate
properly. As a general rule, using 18Avg cabling with an Rdc of 19.3
ohm/km the longest cable distance from the board to the encoder is
limited to 12 m (42ft).
The 20B-ENC-1-MX3 encoder option is functionally identical to the 20B-
ENC-1 encoder with the addition of conformal coating. Figure 5.67 shows
the recommended jumper positions for use with the PowerFlex 7000
Drive.
Input Connections:
All encoder interface Connections are made to J1. The connections are as
follows:
J1 Pin 1 A+
J1 Pin 2 A-
J1 Pin 3 B+
J1 Pin 4 B-
J1 Pin 5 Z+
J1 Pin 6 Z-
J1 Pin 7 Encoder Power Return
J1 Pin 8 Encoder Power (+12V @ 3 Watts)