6. Torque the nuts as follows:
Bussmann fuses: 50 N·m (37 lbf·ft)•
• Other: Refer to the fuse manufacturer's instructions.
7. Close the swing-out frame and install the screws.
￭
Checking and replacing the fuses – frame R8i
The DC/DC converter unit has two sets of fuses: output fuses on the energy storage
side and fuses on the DC bus side.
For the location of the fuses, see the figures:
• The converter fuses [F11.x] on the drive DC bus side are marked with a in the figure.
• The output fuses [F13.x] on the energy storage side are marked with b in the figure.
Converter unit with a DC switch/disconnector Converter unit without a DC switch/disconnector
WARNING!
Obey the safety instructions given in ACS880 liquid-cooled multidrives
cabinets and modules safety instructions (3AXD50000048633 [English]).
If you ignore the safety instructions, injury or death, or damage to the
equipment can occur.
If you are not a qualified electrical professional, do not do installation
or maintenance work.
WARNING!
Do not remove or install a fuse when the drive DC bus is energized. If you do,
serious injury or death, or damage to the equipment can occur.
Replace a blown fuse with a new one of the same type as follows. For tables of
recommended fuses, see the technical data.
1. Stop the drive and do the steps in section Electrical safety precautions (page 49)
before you start the work.
2. Open the cubicle door.
3. Remove the screws of the shroud in the upper part of the cubicle. Remove the
shrouds.
96 Maintenance
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