Rockwell Automation Publication 7000-UM202H-EN-P - November 2023 159
Chapter 3 Control Component Definition and Maintenance
Replacing the Analog Control Board
To replace the analog control boards:
1. Isolate and lock out all power to the drive.
2. Remove the transparent sheet on top of the drive processor module and
the drive processor module itself before removing the ACB. Remove the
transparent sheet on top of the DPM by removing the 4 screws.
3. Use static strap before removing any connectors.
4. Remove the connectors J4, J11 and J12 on DPM after proper identification
and marking if necessary. Use the electrical drawing as the reference.
Remove the four screws holding the DPM on the standoffs above the
ACB.
5. Remove the DPM mounted on the four, 34-pin connectors.
6. Remove the screws holding encoder interface board and gently remove
the board mounted on the 8-pin connector
7. Remove the connectors J1, J2, J3, J4, J5, J6, J7,J8, J9, J10, J12, J13, J14, J16, J22,
J24, J25, J26, J27 on ACB after proper identification and marking if
necessary. Use the electrical drawing as the reference.
8. Remove the ACB board by removing the 4 screws, and 6 standoffs
screwed to support the DPM and encoder interface board.
9. Reverse steps 8 through 2 reinstall the boards into the low voltage control
cabinet.
10. Apply low voltage power and complete both system and medium voltage
tests to ensure the new board functions properly.
Encoder Feedback Board Encoder Options
There are two positional encoder interface boards usable with the drive. 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 the type of encoder board, observe the following conditions.
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-3 Encoder Interface
This encoder interface enables connecting the drive to a standard quadrature
encoder. The 20B-ENC encoder interface provides three optically isolated
differential encoder inputs for A and B phases as well as a Z track. You cannot
configure these inputs for use with a single ended encoder. The board only
supports differential encoders. The board also provides a galvanically isolated
12V/3 W supply to power the attached encoder. You can configure the 20B-
ENC-3 encoder interface for 5V operation, however Rockwell Automation
recommends operation at 12V.
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