Rockwell Automation 20B Power Components Repl. Instructions - Frame 5 - Manual (Page 2)

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Thermistor Replacement
F. Remove the thermistor lead (see photo below) from
the Power Interface Board. Remove the screw securing
the thermistor. Discard thermistor. Thoroughly clean
mounting surface. Apply a thin film of thermal grease
(supplied) to the new thermistor and replace in reverse
order. Torque thermistor screw to 1.7 N-m (15 lbf.-in.).
G. Re-assemble drive in reverse order. Tighten screws to
3.2 N-m (28 lbf.-in.).
Power Supply Board Removal/Replacement
H. Remove the ground lead and screw at the bottom of the
cassette frame. Remove the cassette frame by taking
out the remaining screw.
I. Loosen the Power Supply Board Support Plate. Leave
wires connected and position board/plate off to the
side.
If board replacement is required, transfer wires/cables
to new board. Remove old board, install new board
and tighten screw to 1.7 N-m (15 lbf.-in.).
Power Interface Board, Current Transducer and Power Module
Removal/Replacement
J. Remove upper sheet metal enclosure by taking out the
appropriate screws.
K. Label and remove the wires/cables from the Power
Interface Board.
L. Remove the five screws that secure the board. Remove
the board.
M. If further component replacement is required, proceed
to step N for Current Transducer and/or step S for
Power Module replacement.
If further replacement is not required, replace Power
Interface Board and re-assemble drive in reverse order.
Important: When replacing the Power Interface
Board, the six gate leads must also be
replaced with the leads supplied. Replace
the leads one-at-a-time to assure correct
orientation.
Tighten board screws to 1.7 N-m (15 lbf.-in.) and sheet
metal screws to 3.2 N-m (28 lbf.-in.).
Transducer
Gate Leads Power Interface Board
Thermistor Lead
Transducer
Leads
Shown w/Enclosure Removed
Cassette Frame
Remove Screws
Ground Lead
Power Supply Board
Support Plate
Power Supply Board Support Plate