Design Guide | iC7 Series Air-cooled System Modules
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Figure 26: EMC Protection Level 4
4.
After the change, write "The EMC level was changed" and the date on the "product modified" label. If the label is not yet
attached, attach it on the drive near the product label.
6.10
Fuses of the Drive System
The front-end modules in the drive system must be equipped with fast-acting AC fuses to limit the damage of the drive system. The fuse
sizes are based on Mersen class aR fuses. Use these fuses to achieve sufficient protection against short circuits.
DC fuses must be installed in all system modules to limit the short-circuit current in fault situations. Each DC supply line must be
equipped with fuses. The fuse sizes are based on Mersen class aR fuses. The DC fuses can be provided with the delivery as option. Do not
replace the DC fuses with any other types.
The protective devices must be integrated within the same overall assembly as the system module. The fuse tables can be found in
.
Fuse ratings are based on a maximum fuse ambient temperature of 55 °C (131 °F) and at least 3 m/s airflow.
To ensure fuse performance, make sure that the available supply short-circuit current is sufficient. See minimum required values (I
cp,mr
) at
the fuse location in the tables of AC Fuses for AFE in
10.5.1 List of Fuse Size Information
The AC fuses of the AFE module are delivered preinstalled in the LCL Filter.
6.11
Guidelines for DC Connections of System Modules
The DC busbars and cabling must be dimensioned according to local installation regulations and codes, so that the cross-section is
sufficiently large for the current flowing at the relevant point. See the DC current ratings in
10.6.1 General Current Rating Information
The DC busbar itself must be designed to attain the lowest possible inductance.
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