ABB PSTX370 Service Manual page 37

5. Remove left phase bar and current
transformer
1
Loosen (1x) Hexagon no. 8 M10x60 from
the left phase bar. Also remove sleeve and washer.
2
Loosen (1x) Torx 25 M5x18 from the left
phase bar.
3
Slide the left phase bar outwards from current
transformer until unattached; remove phase bar
and current transformer from unit.
6. Remove SCR
1
Disconnect the SCR cable from module.
2
Loosen (1x) Hexagon no. 8 M10x20
(including square washer) to disconnect
bar from the SCR.
3
Loosen (1x) Hexagon no. 8 M10x20
(including rectangular washer) from the
4
Loosen (4x) Torx 25 M5x18 from the SCR.
5
Remove the SCR by lifting it upwards from unit.
Dispose of expended SCR.
WARNING
• SCR and heatsinks must be
handled carefully 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.
• Make sure that 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.
5
6
the flexible
SCR.
7
1SFC13105M0201
1
2
3
3
2
4
Hex no. 8
1
5
| Service Manual | Service PSTX210...370
Hex no. 8 Tx 25
M10 x 60 M5 x 18
3.6.1_5
3
Tx 25
M10 x 20 M5 x 18
3.6.1_6
3.6.1_7
37