Electrical connections
Assembly Instructions
26
1HSB435410-2 enrev1
Using contact paste or grease
1. Clean all grease and old paste from the contact surfaces.
2. Rub down the surfaces using an abrasive cloth, e.g. Scotch Brite No. 7447.
3. Apply immediately:
- Contact paste on aluminium surfaces.
- Grease “SV”, ABB’s article number 1171 4016-610, on copper surfaces.
4. Fit together the joint with the paste or grease still applied.
5. Wipe off any excess paste or grease.
N.B. Position the bimetallic washers so that the aluminium sides face the
aluminium surfaces and the copper sides are turned towards the copper
surfaces or the silver-plated surfaces.
N.B. The contact paste may only be used on fixed joints. It must not be used
inside the breaking unit.
5.3 Tensioning the closing springs
The circuit-breaker is closed and the motor is started to charge the closing springs
(7). The drive sprocket (11) rotates anticlockwise and pulls up the chain section (15)
so that the spring yoke (19) is lifted and charges the closing springs. The chain
section (16) runs down, while the chain sections (17) and (18) do not move.
Figure 5-2. Charging the closing springs
Item
7 Closing springs
11 Drive sprocket
15 Chain section
16 Chain section
17 Chain section
18 Chain section
19 Spring yoke
17
15
16
7
11
19
18
B20027
To Next Page
Loading...
