Lenze EVS9332xP Manuel d'utilisateur télécharger pdf (Page 80)

100

101

Wiring of the standard device

Notes on project planning

Discharge current for mobile systems

5.2

5.2.6



5.2−4

EDSVS9332P EN 5.0−07/2013

5.2.6 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.

L1L1 LL2

N1 NN2

filter inverter

8200vec017

Fig. 5.2−1 Installation of a two−winding transformer (isolating transformer)

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 444 445

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Lenze EVS9332xP Manuel d'utilisateur Page 80

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