Power Electronics SD750FR, Hardware And Installation Manual

Page: 40 / 80

SD750FR POWER ELECTRONICS
38
POWER CONNECTION
EN
As standard, the input and output terminals are made of tin plated copper. If they are oxidized prior to its
installation, the connections will be poorly executed and will cause overheating. To avoid this effect is
recommended to follow the next steps.
•
It is recommended to use Ø11 tin plated copper terminal lugs.
•
Use M10 zinc bolts and nuts and apply a torque of 40Nm. Check after the first week of
operation that the torque applied is maintained.
•
The number of
busbars depends on the frame size. Check the “Power
terminals” section.
•
Before connecting the cables, clean the contact surface with a clean cloth
and ethanol cleaner.
•
Use a pressure washer and a flat washer between the nut or bolt head and
the terminal lug.
•
Use copper or aluminium 600Vac conductors for up to 480Vac rated
voltage. For 690Vac phase to phase rated equipment use 1kV conductors.
The recommended cable types and lengths between the drive (with factory settings) and the motor are:
•
Unshielded cable : 300m. Asymmetrical 4-wire cable including PE conductor. It is
recommended to use a motor ground cable (PE) with a cross section equal or higher than the
supply motor wires cross section (U, V, W). When single-wire cables are used in three-phase
systems, the three phase conductors must be bundled symmetrically.
•
Shielded cable : 150m. Symmetrical 3-wire cable with PE conductor- with concentric shield. To
implement an effective shield bonding, an EMC cable gland should be used in both the motor
junction box and the drive cabinet to ensure effective 360º ground connection and a low
impedance path for high frequency current. Refer to “EMC installation requirements” section.