Motortronics
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XLS Series Solid State Soft Starter 39 - 1250A
8.4 Replacing the Main Control Board
The printed circuit board is not intended to be field repaired. If the
board is faulty, the entire board should be replaced using the
following procedure:
(See Chapter 9 for the main control board layout.)
• Remove three phase power and control power from the unit and
lock out.
• Remove plugs and tag plugs with connector numbers.
• Remove control wires from terminals and tag wires with terminal
numbers.
• Note the settings of all dip switches.
• Remove the mounting screws.
• Remove the old printed circuit board.
• Mount the new printed circuit board.
• Install the mounting screws.
• Set the dip switches to the same position as on the old board.
• Install the control wires onto correct terminals per tag sequence.
• Install the plugs.
• Apply power to the unit and test.
washer gauge, verify that the washer spins freely after clamping.
Once proper force is reached make sure that the SCR pucks are
securely held between the heatsinks and aligned evenly.
• Replace any lugs, MOVs, snubbers, power straps, printed circuit
boards and associated wiring that was removed in step 4. Use the
following chart to verify wiring of J5, J6 and J7:
• After verifying that all wiring is correctly connected, test the SCR
and then test the unit.
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