gefran AFE200 4 Series Instruction Manual page 24

capacitors may be impaired and must be "reformed". Before commissioning devices
that have been stored for long periods, connect them to a power supply for two hours
with no load connected in order to regenerate the capacitors (the input voltage has to
be applied without enabling the AFE).
En cas de stockage des variateurs pendant plus de deux ans, il est conseillé de contrôler
l'état des condensateurs CC avant d'en effectuer le branchement. Avant la mise en service
des appareils, ayant été stockés pendant long temps, il faut alimenter variateurs à vide pen-
dant deux heures, pour régénérer les condensateurs : appliquer une tension d'alimentation
sans actionner le AFE.
Type of networks
AFE are designed to be powered from standard three phase lines that are electri-
cally symmetrical with respect to ground (TN or TT network). It is possible the use
with IT network. In case of use of networks at 690Vac, all AFE200-6 sizes with the
use of standard filters (EMI-FN3359HV series) can be utilized.
For the series 400/480V (AFE200-4), only the size 4450 and 5900 must be re-
quested specifically for use for IT networks (AFE200-4-IT series).
All AFE200-4 requires the use of special EMC filters for IT networks (on request).
Power supply networks
Based on the grounding method, the IEC 60634-1 describes three main types of
grounding for power supply networks: TN, TT and IT systems.
In particular, the IT system has all the active parts insulated from earth or a point
connected to ground through an impedance. The earths of the system are con-
nected separately or collectively to the system ground.
The following figures show these different systems.
24
TN-S supply lines
L1
L2
L3
N
PE
TT supply lines
L1
L2
L3
N
PE
AFE200 • Instruction Manual
TN-C supply lines
L1
L2
L3
PEN
IT supply lines
L1
L2
L3
PE