CDD3000-HF Operation Manual
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Line chokes are required:
•
Where the drive controller is used in applications with disturbance
variables corresponding to environment class 3, as per EN 61000-2-
4 and above (hostile industrial environment).
•
To comply with the limit values for variable-speed electric drives
(standard EN61800-3 / IEC1800-3)
•
With a dc-link between multiple drive controllers.
Characteristics of environment class 3 include:
•
Mains voltage fluctuations > + 10% U
N
•
Short-time interruptions between 10 ms and 60 s
•
Voltage asymmetry > 3%
Environment class 3 typically applies where:
•
a major part of the load is supplied by power converters (dc choppers
or soft-start equipment)
•
welding machines are present
•
induction or arc furnaces are present
•
large motors are started frequently
•
loads fluctuate rapidly.