Lenze E82xVxxxKxxxxx - Manual (Page 102)

Electrical installation
Notes on project planning
Discharge current for mobile systems
6
l
102 EDS82EV903 EN 3.0
6.2.5 Discharge current for mobile systems
Frequency inverters with internal or external RFI filters usually have a discharge current to
PE potential that is higher than 3.5 mA AC or 10 mA DC.
Therefore, fixed installation as protection is required (see EN 61800−5−1). This must be
indicated in the operational documents.
If a fixed installation is not possible for a mobile consumer although the discharge current
to PE potential is higher than 3.5 mA AC or 10 mA DC, an additional two−winding
transformer (isolating transformer) can be included in the current supply as a suitable
countermeasure. Here, the PE conductor is connected to the PEs of the drive (filter, inverter,
motor, shieldings) and also to one of the poles of the secondary winding of the isolating
transformer.
Devices with a three−phase supply must have a corresponding isolating transformer with
a secondary star connection, the star point being connected to the PE conductor.
prim. sec.
L1
N
PE
L1 L1 L L2
N1 N N2
U
V
W
filter inverter
M
3~
8200vec017
Fig. 6−1 Installation of a two−winding transformer (isolating transformer)
)
Note!
For controllers in a single−phase power range from 0.25 to 0.55 kW, RFI filters
of type E82ZZxxxxxB220 (version: "LL"; low leakage) are available. Hence, the
controller and the filter generate a leakage current < 3.5 mA AC or < 10 mA DC,
respectively.