Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control - Manual (Page 361)

Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014 361
Component Definition and Maintenance Chapter 5
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.
Figure 297 - Encoder Interface (20B-ENC-1 and 20B-ENC-1-MX3)
J3
J3
J2
+12V
1 2 3
12
11
21
+5 VR EF
1 2 3
+5V
+12V
1 2 3 +12V
+5V
12
11
21
12
11
21
Output
Config.
J2
Intput
Config.
Note: Must be configured
for 12V operation.