6
vacon • 36
CABLING AND CONNECTIONS
Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 205
6.2.2
Mains and motor cables
The mains cables are connected to terminals L1, L2 and L3 (12-pulse units 1L1, 1L2, 1L3, 2L1, 2L2,
2L3) and the motor cables to terminals marked with U, V and W, see Figure 15.
In converters consisting of double input sections, an even number of input cables is required. In
converters consisting of double power modules an even number of motor cables is needed. See
Table 13 to Table 17 for cabling recommendations.
The output cables to the motor must be 360
o
EMC earthed. Separate EMC earthing clamps are
supplied with NXC FR9 if an output filter is used and with all drives of sizes FR/AF10-12. In NXC FR/
AF13-14, EMC earthing is implemented directly through cable glands and earthing clamps are
unnecessary. See Chapter 6.2.2.1 for more information on EMC earthing for FR/AF13-14.The EMC
earthing clamps can, for instance, be installed on the mounting plate in front of the AC choke as
shown in Figure 14 below. The EMC earthing clamps must be suited to the output cable diameter to
give a 360
o
contact with the cables. See Chapters 6.2.6 and 6.2.7 for output cable diameters. See
Figure 14. Figure Installing EMC earthing
In 12-pulse drives with double inputs or outputs it is very important that the same
cable dimensions, type and routing is used for all cables. In case the cabling between
the converter modules is not symmetrical, unequal load might occur and reduce
loadability or even damage the converter.
In units with double motor outputs the motor cables must not be connected together
in the converter end. Always connect the parallel motor cables together in the motor
end only. The minimum motor cable length is 5 m.
If a safe switch between the frequency converter and the motor is used, make sure
that it is switched on before setting the frequency converter in run state.
13006.emf
13006.emf
13006.emf
PE rail
EMC earthing
Cable fixing clamps
11494_uk
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