ABB PSTX370, Service Manual

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72 Service PSTX470...570 | Service Manual | 1SFC13105M0201
4. Remove brackets
1
Loosen (2x) Torx 30 M6x25 and remove the
angle bracket from cooling tower.
2
Loosen (2x) Torx 30 M6x16 and remove the
bolted bar from cooling tower.
3
Loosen screw that attach phase rail to cooling
tower
(1x) Torx 30 M6x16
.
5. Remove screw-nuts and tension bars from
cooling tower
1
Loosen and remove
(2x) Hexagon M10
Screw-nut and the two spring washers from
cooling tower.
2
Remove the tension bar and the two torque
washers from cooling tower.
3
Remove the distance bar from cooling tower.
6. Remove heatsinks and SCR from cooling
tower
1
Remove the upper heatsink and upper SCR unit
by lifting them upwards from mounting screws.
2
Remove the middle heatsink and lower SCR
unit by lifting them upwards from mounting screws.
Do not remove the isolation plastic pipes from
mounting screws. Dispose of expended SCR.
WARNING
• SCR:s and heatsinks must be
handled with care to avoid scratches and other
marks.
• Do not scratch the contact surfaces with the
guide pins.
• Do not touch the contact surfaces.
• Do not lift the SCR by the wire.
• Ensure there is no damage to the welding flange
or to the contact surface.
7. Preparation of heatsink and SCR
• Clean all polished contact surfaces carefully with
Ethanol.
• Use well moistened lint-free paper.
• Avoid contact with surface.
• Lubricate directly after polishing/cleaning, within
5 minutes. The contact surfaces must be dry
before lubrication.
• Apply a couple of drops of silicone oil on the
cleaned contact surfaces, avoid getting oil in the
guide hole. Smooth the oil lightly over the whole
surface using lint-free paper. Then wipe off the
surface in order to get a very thin layer of oil.
• Avoid contact with the surfaces after lubrication.
Use the service kit in the spare part catalog
1SFC001013C0201.
Tx 30
M6 x 16
M6 x 25
4
4.7.1_4
1
2
3
Hexagon nut
M10
5
4.7.1_5
1
2
3
6
4.7.1_6
1
2
7
4.7.1_7
1 2
4