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96 Maintenance
Replacing the supply unit DC fuses (frame R7i)
￭
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or
death, or damage to the equipment can occur.
WARNING!
Use the required personal protective equipment. Wear protective gloves and
long sleeves. Some parts have sharp edges.
1.
Stop the drive and do the steps in section
before you start the work.
2.
Open the door of the module cubicle.
3.
Remove the shrouding in front of the fuses (upper part of the cabinet).
4.
Check the condition of the fuses. In case of a blown fuse, replace all fuses with
similar fuses: slacken the nuts of the screws of the fuses, and slide out the fuse
blocks. Do not unscrew the nuts completely, not to drop them inside the cubicle.
5.
Make note of the order of the washers on the screws.
6.
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.
7.
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).
8.
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.
9.
Attach the shrouding and close the door.
Electrical safety precautions (page 43)
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