Manual for UWI

Manual for UWI
Instructions for the Power Board´s
replacement
UNITOR
UWI 203
Make sure that the machine is
disconnected from the main line
before removing the cover.
UNITOR
UWI 203
Step 1: Remove the cover (10 Philips screws).
FRONT
Main Switch
Input Bridge Rectifier
UNITOR
UWI 203
Step 2: Disconnect the Input Bridge Rectifier Wires:
UNITOR
UWI 203
Step 3: Disconnect the Input Power Cables from the
Main Switch:
UNITOR
UWI 203
Power Board
FRONT
UNITOR
UWI 203
Step 4: Extract the plastic spacers with a tong.
UNITOR
UWI 203
Step 5: Remove the connector from the Power Board and
the wire from the Input Bridge Rectifier and from the
switch.
Fan connector
Thermal switch and
output voltage wires
Flat from
the front panel
Current sensor
UNITOR
UWI 203
Step 6: Remove the screews from the Power Board in
the sequence indicated.
9
1
5
6
4
7
2
8
3
UNITOR
UWI 203
Step 7: Remove the primary wires of the power
transformer (the 2 nuts inside the shape).
UNITOR
UWI 203
Step 8: Clean the heatsink with alcohol.
After this you are ready for puting in the new Power Board.
UNITOR
UWI 203
Step 9: Put the thermal grease on the Power Module (the
grease must be fluid neat like a cream and a thiny film; we suggest to use a
sponge roller for painting or a paintbrush; it possible to add a very little quantity
of diesel fuel to soften up the grease).
UNITOR
UWI 203
Step 10: Fix the primary wires of the power
transformer (the 2 nuts inside the shape).
UNITOR
UWI 203
Step 11-1: With the Power Board in this position, put the
wires and the connectors in the correct position.
FAN CABLE
UNITOR
UWI 203
Step 11-2: With the Power Board in this position, put the
wires and the connectors in the correct position.
INPUT BRIDGE WIRES
UNITOR
UWI 203
Step 11-3: With the Power Board in this position, put the
wires and the connectors in the correct position.
PUT THE CONNECTORS IN THE RIGHT POSITION AND THE YELLOW-GREEN WIRE
Block the Flat of front panel with silicone or hot glue (Blue shape).
UNITOR
UWI 203
Step 12: Fix the Power Board to the heatsink.
First step
Second step
UNITOR
UWI 203
Step 13: Change the Input Bridge Rectifier.
Remove it and
clean the part with alcohol
Put the thermal grease
on the Input Bridge
Rectifier a fix it
on the heatsink
UNITOR
UWI 203
FRONT
Step 14: Connect the wires of Power Board to the
Input Bridge Rectifier and to the Main Switch.
Main Switch
Input Bridge Rectifier
UNITOR
Step 15: Test the
machine!
Weld an electrode with
70 A and 160 A current!
UWI 203
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