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ELECTRICAL CABLING AND CONNECTIONS
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6
6.1.2
Drive protection – Fuses
In order to protect the drive from short-circuits and excessive loads, input line fuses are used. Depending
on the drive configuration, the following types of fuse protection are recommended:
Frequency converter with AC supply:
Always protect the drive with fast-acting input line fuses for short-circuit protection. Also pay attention to
protection of cables!
Common DC bus:
•
Inverter units: Choose fuse protection according to Table 6-9 and Table 6-10.
•
Active Front End (AFE) units: Choose DC fuses according to Table 6-9 and Table 6-10; Appropriate
fuses for the AC supply are listed in Table 6-11 and Table 6-12.
•
Inverter units connected to AFE units: Choose fuses for AC supply according to Table 6-11 and
Table 6-12; NOTE: Protect each inverter unit with fuses according to Table 6-9 and Table 6-10.
DC links interconnected (e.g. 2*CH74)
In case interconnection of DC links is required please contact the manufacturer.
Brake chopper unit
See chapter 10.