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Electrical Installation
Comply with the following at installation:
•
Safety earthing: The drive has a high leakage current and must be earthed properly for safety. Follow
all local safety regulations.
•
High frequency earthing: Keep earthing connections as short as possible.
Connect all earthing systems to ensure the lowest possible conductor impedance. The lowest possible conductor
impedance is achieved by keeping the conductor as short as possible and by grounding with the greatest pos-
sible surface area. If multiple drives are installed in a cabinet, the cabinet backplate, which must be made of
metal, should be used as a joint earth reference plate. The drives must be fitted to the backplate at the lowest
possible impedance.
To achieve low impedance, connect the drive to the backplate with the drive fastening bolts. Remove all paint
from the contact points.
RCD relays, multiple protective earthing or earthing can be used as extra protection, provided that local safety
regulations are complied with. In the case of an earth fault, a DC content may develop in the faulty current. Never
use an RCD (ELCB relay), type A, as it is not suitable for DC faulty currents. If RCD relays are used, local regu-
lations must be complied with.If RCD relays are used, they must be:
-
Suitable for protecting equipment with a DC content in the faulty current (3-phase bridge rectifier).
-
Suitable for a pulse-shaped, brief discharge on power-up.
-
Suitable for a high leakage current.
N must be connected before L1 for single phase 200 V reduced leakage current units (type code R4).
TR1 2800 Series VFD
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