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128 Maintenance
Checking and replacing the AC fuses
WARNING! Only qualified electricians are allowed to do this work. Read the
complete safety instructions of the drive. Ignoring the instructions can cause
physical injury or death, or damage to the equipment.
1. Disconnect the drive from the AC power line and make sure it is safe to start the work.
See section
Basic electrical safety precautions
2. Open the door of the cubicle in which the fuses are.
3. Remove the shrouding (a) from in front of the fuses.
4. Slacken the nuts (b) 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.Tighten the nuts to torque as follows:
•
Bussmann fuses: 50 N•m (37 lbf•ft)
•
Mersen (Ferraz Shawmut): 46 N•m (34 lbf•ft)
•
Other: Refer to the fuse manufacturer's instructions.
7. Reinstall the shrouding removed earlier and close the cubicle door.
3
4
on page 96.
b
a
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