07-02-12-02-EN-V1215.doc / Type: 638
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5.3 DC Link Parallel Connection
● General
With the operation of a group of drives it is possible to couple the DC link circuit of the 638 Drives.
Advantages:
Positive energy balancing - utilization of braking energy, with energy equalization achieved
through the DC link
Smaller load on the ballast resistors
Increased DC link capacity through smaller residual rippling, specifically with single phase
applications
Increase of the internal ballast peak performance
Increase of the internal ballast continuous power rating
Internal unit balancing resistance provides for a uniform rectifier load sharing with a parallel
incoming power supply
● Variation 1; Servo Drives without DC LINK protection
Block Diagram 638A (1-phase)
Advantage:
no DC-fuses necessary.
Disadvantage:
Sum of power limited by line fuse.
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