J. T. Eaton LCX9000 user manual Power Wiring, Power Connections, Mains Cable, Motor Cable

LCX9000 Liquid-Cooled Drives User Manual

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 3-5shows 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 2-2to 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 2-2to 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 4-6and Table 3-1.

MN04005001E For more information visit: www.EatonElectrical.com 3-1