ABB ACS1000i air-cooled, User Manual

Page: 101 / 174

07 ELECTRICAL INSTALLATION
3BHS206977 E01 REV H ACS1000I AIR-COOLED USER MANUAL 101/174
7.5.5.3 Bolted connections
7.5.5.3.1 Material requirements
Use stainless steel bolts and nuts with the appropriate steel grade and property class for the
connection (recommended: A2-70 [designation according to ISO 3506]).
Note: Nuts with bonded coating can be used as an alternative to uncoated stainless steel nuts.
7.5.5.3.2 Connection type
The following connection type is recommended when a cable lug (4 in Fig. 7-10) is connected
to a busbar:
- Spring washer (1 in Fig. 7-10) and flat washer (2 in Fig. 7-10) on each side of the busbar
(3 in Fig. 7-10).
Note: Other washers can be used, provided they maintain the required contact pressure.
Figure 7-10: Bolted busbar connections
- Use cable lugs suitable for M12 bolts.
- If two conductors are used per phase, install the second conductor on the opposite side of
the busbar.
7.5.5.3.3 Lubrication
- If stainless steel bolts and nuts are used, lubricate the thread and head contact surface of
the bolt using recommended pasts, eg, Molykote D paste.
Note: If a coated nut (eg, with bonded molybdenum-disulfide [MoS
2
] coating) is used, the
connection does not have to be lubricated.
7.5.5.4 Tightening torque
- Tighten bolted connections with bolts of sizes M10 and greater with the recommended
nominal torque for the bolt size used.
(1) Spring washer
(2) Flat washer
(3) Busbar
(4) Cable lug
1 2 3 4 2 1