ABB ACH550-02-602A-4 [402/454] Line current harmonics

398 Technical data

ACH550-02 User’s Manual

Input power (mains) cables, fuses and circuit breakers

With high power installations, the same power rules are valid for

supply and motor cables. A symmetrical 3-phase cable with

concentric shield is recommended. This is the praxis in industrial

installations and high power building installations. The

dimension of the shield has to be at least 50% of the phase

conductor. If not, a separate earth/PE conductor has to be used.

Dimension the cables and fuses in accordance with the input

current. Always pay attention to local codes when sizing the

cables and fuses.

The input power connectors are at the bottom of the drive. Input

power cable routing must be done so that the distance from the

sides of the drive is at least 20 cm (8 in) to avoid excessive

radiation to the input power cable. In case of shielded cable,

twist the cable screen wires together into a bundle (pigtail) not

longer than five times its width and connect to the PE terminal of

the drive (or PE terminal of input filter, if present).

Line current harmonics

The current harmonic levels under rated load conditions are

available on request.

Fuses

Branch circuit protection must be provided by the end-user,

sized per national and local electric codes. Recommendations

for fuses for short-circuit protection on the input cable and the

drive are given in this section.

Verify that the fuse operates rapidly enough by checking that

the short-circuit current of the installation is at least the

minimum short-circuit current given in the table below. The

short-circuit current of the installation can be calculated as

follows: