44
cONNecTION Of THe POWer UNIT
4.2.3 Ac connection
4.2.3.1 AC supply 400V / 3-phase
L1
L2
L3
PE
L1
L2
L3
U
V
W
PE
PE
No.
Type
Description
①
Mains voltage
3-phase 400 V AC
Mains form
TN, TT
IT
The rated voltage between one phase conductor and earth potential (or arti-
ficial neutral point in the IT mains) must not exceed 300V (effective value).
Personal protection
RCMA with separator or RCD type B
Earth leakage monitor
②
Mains fuses
Type gG or MCCB
③
Mains contactor
④
Mains choke
“Cable-fed disturbances depending on the motor line length at AC supply”
⑤
HF filter
Optional to observance the limit values according
for units with-
out internal filter
⑥
KEB COMBIVERT
S6
Figure 13:
Connection of the mains supply
The service life of drive converters with voltage DC link depends on the DC voltage, sur-
rounding 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 capacitors to a considerable extent,
especially when connecting to „hard“ power systems or when under permanent drive load
(continuous duty). The term "hard" power system means that the nodal point power (
S
net
)
of the mains is very high (>> 200) compared to the rated apparent output power of the drive
converter (
S
out
).
k =
S
net
>> 200
e.g.
k =
2 MVA (supply transformer)
= 500 ––> Choke required
––––
–––––––––––––––––––––
S
out
4 kVA (10S6)
Summary of Contents for COMBIVERT S6 Series
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