ABB ACS880-17, Hardware Manual

Page: 165 / 244

Maintenance 165
Fuses

Replacing the AC fuses in the incoming cubicle
Units without a main breaker have AC fuses in the incoming cubicle (or, in the case of
frame 1×R8i + 1×R8i, in the combined supply and inverter module cubicle).
WARNING! Obey the instructions in chapter Safety instructions . If you
ignore them, injury or death, or damage to the equipment can occur.
1. Do the steps in section Precautions before electrical work (page 21 ) before you start
the work.
2. Open the cubicle door.
3. Remove the shrouding from in front of the fuses.
4. Slacken the nuts of the headless screws of the fuses so that you can slide out the fuse
blocks. Make note of the order of the washers on the screws.
5. Remove the screws, nuts and washers from the old fuses and attach them to the new
fuses. Make sure to keep the washers in the original order.
6. Insert the new fuses into their slots in the cubicle. Pre-tighten the nuts first by hand or
by applying a torque of no more than 5 N·m (3.7 lbf•ft).
7. Tighten the nuts to torque as follows:
•
Cooper-Bussmann fuses: 50 N•m (37 lbf•ft)
•
Mersen (Ferraz Shawmut) fuses: 46 N•m (34 lbf•ft)
•
Other: Refer to the fuse manufacturer’s instructions.
8. Reinstall the shroud and close the door.

Replacing the AC fuses in the LCL filter module or supply module
cubicle (frame 3×R8i + 3×R8i and up)
Frames 3×R8i + 3×R8i and up have AC fuses located above each LCL filter module. To
replace, use the procedure
Replacing the DC fuses in the supply module cubicle (frame
2×R8i + 2×R8i and up) below.