CABLING AND CONNECTIONS
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6
6.2
Power connections
6.2.1
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 6-3.
In converters consisting of double input sections (some FR11 and all FR12 units), an even number of
input cables is required. In converters consisting of double power modules (FR12) an even number
of input cables and an even number of motor cables is needed. See tables 6-2 to 6-5 for cabling
recommendations.
In 12-pulse units and in types with double inputs (FR11 and FR12) or outputs (FR12) is it
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 inside
converter might 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 5m.
The output cables to the motor must be 360
o
EMC earthed. The EMC grounding clamps can, for
instance, be installed on the mounting plate in front of the AC choke as shown in the figure below.
The EMC grounding clamps must be suited to the output cable diameter to give a 360
o
contact with
the cables. Refer to chapters 6.2.4 and 6.2.5 for output cable diameters. See Figure 6-2.
Figure 6-2. Installing EMC grounding
For more detailed cable installation instructions, see chapter 7, step 6.
Use cables with a temperature rating of at least +70
°
C. As a rule of thumb, cables and the fuses can
be dimensioned according to the frequency converter nominal OUTPUT current which you can find
on the rating plate. Dimensioning according to the output current is recommended because the
frequency converter input current never significantly exceeds the output current.
Tables 6-2 and 6-4 show the minimum dimensions of Cu- and Al-cables and the recommended aR
fuse sizes.
If the motor temperature protection of the drive (see Vacon All in One Application Manual) is used as
an overload protection, the cable should be chosen accordingly. If three or more cables are used
parallelly (per block) in bigger units each cable requires a separate overload protection.
WARNING
WARNING
PE rail
EMC grounding
Cable fixing clamps
