7400255-110 Additional instructions and notes WARNING! Obey these instructions. If you ignore them, injury or death, or damage to the equipment can occur. • If you install the drive on an IT system (an ungrounded power system or a highresistance-grounded [over 30 ohms] power system), disconnect the internal EMC filter; otherwise the system will be connected to ground potential through the EMC filter capacitors. This can cause danger or damage the drive. Note: Disconnecting the internal EMC filter increases the conducted emission and reduces the drive EMC compatibility considerably. • If you connect the drive to an IT system (an ungrounded power system or a highresistance-grounded [over 30 ohms] power system), disconnect the varistor from ground. Failure to do so can cause damage to the varistor circuit. • If you install the drive on a corner-grounded TN system, disconnect the internal EMC filter; otherwise the system will be connected to ground potential through the EMC filter capacitors. This will damage the drive. Note: Disconnecting the internal EMC filter increases the conducted emission and reduces the drive EMC compatibility considerably. • Use all ELV (extra low voltage) circuits connected to the drive only within a zone of equipotential bonding, that is, within a zone where all simultaneously accessible conductive parts are electrically connected to prevent hazardous voltages appearing between them. You can accomplish this by a proper factory grounding, that is, make sure that all simultaneously accessible conductive parts are grounded to the protective earth (PE) bus of the building. • Do not do insulation or voltage withstand tests on the drive. Note: • The motor cable terminals of the drive are at a dangerous voltage when the input power is on, regardless of whether the motor is running or not. • The DC and brake resistor terminals (UDC+, UDC-, R+ and R-) are at a dangerous voltage. • External wiring can supply dangerous voltages to the terminals of relay outputs. • The Safe torque off function does not remove the voltage from the main and auxiliary circuits. The function is not effective against deliberate sabotage or misuse. WARNING! Use a grounding wrist band when you handle the printed circuit boards. Do not touch the boards unnecessarily. The components on the boards are sensitive to electrostatic discharge. Safety instructions 17 Grounding These instructions are for all personnel who are responsible for the electrical installation, including the grounding of the drive. WARNING! Obey these instructions. If you ignore them, injury or death, or equipment malfunction can occur, and electromagnetic interference can increase. • If you are not a qualified electrician, do not do grounding work. • Always ground the drive, the motor and adjoining equipment to the protective earth (PE) bus of the power supply. This is necessary for the personnel safety. Proper grounding also reduces electromagnetic emission and interference. • In a multiple-drive installation, connect each drive separately to the protective earth (PE) bus of the power supply. • Make sure that the conductivity of the protective earth (PE) conductors is sufficient. Refer to Selecting the power cables on page 46. Obey the local regulations. • Connect the power cable shields to the protective earth (PE) terminals of the drive. • Make a 360° grounding of the power and control cable shields at the cable entries to suppress electromagnetic disturbances. Note: • You can use power cable shields as grounding conductors only when their conductivity is sufficient. • Standard IEC/EN 61800-5-1 (section 4.3.5.5.2.) requires that as the normal touch current of the drive is higher than 3.5 mA AC or 10 mA DC, you must use a fixed protective earth (PE) connection. In addition, • install a second protective earth conductor of the same cross-sectional area as the original protective earthing conductor, or • install a protective earth conductor with a cross-section of at least 10 mm2 Cu or 16 mm2 Al, or • install a device which automatically disconnects the supply if the protective earth conductor breaks |
