J. T. Eaton Liquid-Cooled Drives LCX9000 - Manual (Page 47)

LCX9000 Liquid-Cooled Drives User Manual
MN04005001E For more information visit: www.EatonElectrical.com 3-1
January 2007
Chapter 3 — Power Wiring
How the power connections of LCX9000 Liquid-Cooled units are implemented depends on
the size of the unit. The smallest liquid-cooled unit (CH3) has terminal blocks for the
connections. In all other units, the connection is established using cables and cable clips or
bolting the busbars together.
The main circuit diagrams of each Liquid-Cooled drive chassis are in Appendix B.
Power Connections
Use cables with heat resistance of at least +158°F (+70°C). The cables and the fuses must be
sized according to the drive nominal OUTPUT current that you can find on the rating plate.
Sizing according to the output current is recommended because the drive input current never
significantly exceeds the output current. Installation of cables according to UL regulations is
presented on Page 3-10.
In chassis CH5 and greater, the field cables (both motor and mains) should be connected to a
specific cable connection block (optional equipment). However, inside a switchgear, the cable
connection can be made directly to the drive.
Table 3-5 shows the minimum sizes of the Cu-cables and the corresponding aR fuse sizes.
If the motor temperature protection of the drive (see the application manual) is used as an
overload protection, the cable should be chosen accordingly. If three or more cables are used
in parallel, each cable requires a separate overload protection.
These instructions apply only to cases with one motor and one cable connection from the
drive to the motor. In any other case, ask Eaton for more information.
Mains Cable
The mains cables of size CH31 are connected to terminal blocks (see Figure 2-2), whereas
busbar connection is used for larger sizes, see drawings on Pages 2-2 to 2-7. Mains cable
type for EMC level N is in Table 3-1.
Motor Cable
In order to avoid current sharing disbalance, it is imperative to use symmetrical motor
cables. Eaton also recommends always using shielded cable whenever possible.
The motor cables of size CH31 are connected to terminal blocks (see Figure 2-2), whereas
busbar connection is used for larger sizes, see drawings on Pages 2-2 to 2-7. Motor cable
type for EMC level N is in Table 3-1.
Ask Eaton for more information on the use of ferrite cores with the motor cable in order to
protect the motor bearings against motor bearing currents.
For information on control cables see Page 4-6 and Table 3-1.