ABB PSTX 30***105, Service Manual

Page: 45 / 60

1SFC13105M0201 | Service Manual | Service PSTX720...840 45
8. Remove heat sinks and SCR from cooling
tower
1
Remove the upper heat sink and upper SCR
unit by lifting them upwards from stud bolts.
2
Remove the middle heat sink and lower SCR
unit by lifting them upwards from stud bolts.
Do not remove the insulation plastic pipes from
stud bolts. Dispose of expended SCR.
WARNING
• SCR:s and heat sinks 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.
9. Preparation of heat sink 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.
8
3.7.1_8
1
2
9
3.7.1_9
3