VLT ® 2900 Series General information about electrical installation High voltage warning used, local regulations must be complied with.If RCD relays are used, they must be: The voltage of the frequency converter is dangerous whenever the equipment is connected to mains. Incorrect installation of the motor or frequency converter may cause damage to the equipment, serious injury or death. Comply with the instruc- tions in this manual, as well as national and local rules and safety regulations. Touching the electrical parts may be fatal - even after the equipment has been dis- connected from mains: Wait at least 4 minutes for current dissipate.
- 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). High voltage test NB! It is the responsibility of the user or instal- ler to ensure correct earthing and protec- tion in accordance with national and local standards. A high voltage test can be performed by short-circuit- ing terminals U, V, W, L1, L2 and L3, and applying max. 2160 V DC in 1 sec. between this short-circuit and terminal 95. Earthing 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 con- nections 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 con- ductor as short as possible and by grounding with the greatest possible 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 back- plate 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 cur- rent. Never use an RCD (ELCB relay), type A, as it is not suitable for DC faulty currents. If RCD relays are Extra protection 60 MG.29.A3.02 - VLT ® is a registered Danfoss trademark