KEB COMBIVERT F6 Instructions For Use Manual - page 50
4.2.3.3 Note on hard power systems
The service life of drive converters with voltage DC link depends on the DC voltage,
surrounding temperature and the current load of the electrolytic capacitors in the DC
link. The use of mains chokes can increase the service life of the condensators to a con-
siderable extent, especially when connecting to „hard“ power systems or when under
permanent drive load (continuous duty). For continuous duty (S1) drives with a medium
duty of > 60 %, KEB provided the use of mains chokes with a terminal voltage U
k
of 4%.
The term "hard" power system means that the nodal point power (S
Net
) of the mains is
very high (>> 200) compared to the output rated power of the drive converter (S
out
).
k =
S
Net
>> 200
e.g.
k =
2 MVA (supply transformer)
= 33
––> no choke required
––––
–––––––––––––––––––––
S
out
62 kVA (21F6)
Alistingoffiltersandchokes
50
cONNecTION OF THe POWer UNIT