Rockwell Automation 20B Power Components Repl. Instructions - Frame 5 - Manual (Page 3)

3
Current Transducer Replacement
N. With the Power Interface Board still removed, locate
the transducer to be replaced.
O. Remove the screw securing the U, V or W lead that
extends through the transducer. Remove the lead from
the center of the transducer.
P. Remove the transducer and insulator (located under
transducer) by taking the 2 screws out. Orient new
transducer and insulator as shown, install screws and
tighten to 1.7 N-m (15 lbf.-in.).
Q. Replace the U, V or W lead and tighten screw to 4.5
±0.5 N-m (40 ±4.0 lbf.-in.).
R. If further component replacement is required, proceed
to step S for Power Module replacement.
If further replacement is not required, replace Power
Interface Board.
Important: If a new Power Interface board is being
installed, the six gate leads must also be
replaced with the new leads supplied. It is
recommended that the leads be replaced
one-at-a-time to assure correct
orientation.
Tighten board screws to 1.7 N-m (15 lbf.-in.).
Re-assemble remainder of drive. Tighten sheet metal
screws to 3.2 N-m (28 lbf.-in.).
Power Module Replacement
S. For easier component access, position drive on its right
side. With the Power Interface Board still removed,
locate the Power Modules and Bus Bar.
T. Disconnect the U, V and W leads, but leave the Gate
Leads in place.
U. Remove the Bus Bar by taking out the appropriate
screws and spacers. Discard bar.
V. Remove the first Power Module and set aside. Place a
new module next to the old, and transfer the leads.
W. Thoroughly clean the module mounting surface. Apply
a thin coating of the supplied thermal grease to the
new module. Install with the supplied screws and
tighten using the sequence below
X. Repeat for remaining modules.
Y. Replace the U, V and W leads. Tighten screws to 4.5
N-m (40
±4.0 lbf.-in.).
Z. Install new Bus Bar (supplied) and tighten screws/
spacers to 4.5
±0.5 N-m (40 ±4.0 lbf.-in.).
Replace the Power Interface Board and tighten board
screws to 1.7 N-m (15 lbf.-in.).
Important: If a new Power Interface board is being
installed, the six gate leads must also be
replaced with the new leads supplied. It is
recommended that the leads be replaced
one-at-a-time to assure correct
orientation.
Re-assemble remainder of drive. Tighten sheet metal
screws to 3.2 N-m (28 lbf.-in.).
Transducer Arrow “ ”
Must Point Away from
Circuit Board
Bus Bar U, V, W Leads
Power Modules
1
3
4
2
C2E1 E2 C1
Power Module Torque Sequence
First Sequence: 0.7 N-m (6.0 lbf.-in.)
Second Sequence: 2.3 N-m (20 lbf.-in.)
Final Sequence: 4.5
±0.5 N-m (40 ±4.0 lbf.-in.)