Rockwell Automation 7000L PowerFlex 7000 Medium Voltage AC Drive C Frame - Marine - Manual (Page 278)

4-102 Component Definition and Maintenance
7000L-UM302B-EN-P – June 2013 7000 ―C‖ Frame - Marine
Tachometer Feedback Board Encoder Options
There are two positional encoder interface boards that may be used
with the PowerFlex 7000 Forge Control. The encoder interface boards
do not have any user accessible test points; however, buffered and
isolated versions of each of the signals A+, A-, B+, B-, Z+ and Z- are
available on the ACB at test points TP45-TP50.
Regardless of which type of encoder board, the following conditions
should be adhered to:
1. Do not attach encoders with open collector outputs to the drive.
Acceptable outputs are Analog Line Driver or Push Pull.
2. The drive will not operate properly if using single ended
Quadrature encoders. Rockwell Automation recommends using
differential inputs only for these types of encoders. Single ended
outputs are only acceptable for Positional Encoders.
20B-ENC-1 & 20B-ENC-1-MX3 Encoder Interface
This encoder interface allows the drive to be connected to a standard
Quadrature Encoder. The 20B-ENC encoder interface provides 3
optically isolated differential encoder inputs for A and B phases as
well as a Z track. These inputs cannot be configured for use with a
single ended Encoder. Differential encoders only are supported. The
board also provides a galvanically isolated 12V/3Watt supply to
power the attached encoder. The 20B-ENC-1 Encoder interface may
be configured for +5V operation, however Rockwell recommends
operation at 12V.
J3
J3
J2
+1 2V
1 2 3
12
11
2
1
+5 VR EF
1 2 3
+5V
+12V
1 2 3 +12V
+5V
12
11
2
1
12
11
2
1
Output
Config.
J2
Intput
Config.
Note: Must be configured
for 12V operation.
Figure 4.74 – Encoder Interface (20B-ENC-1 and 20B-ENC-1-MX3)