5
vacon • 64
Installation
Tel. +358 (0) 201 2121 • Fax +358 (0)201 212 205
5.3
Power connection
5.3.1
AC connection
The 3-phase input is connected to the input terminals of the LCL filter (L1, L2 and L3). The output
terminals of the LCL filter (U, V and W) are connected to the input terminals of the AFE unit (U, V
and W), Figure 8. The AC input of the AFE input group must be protected against short circuit. The
fuses suitable for protection are shown in Chapter 4.11. A circuit breaker can also be used for
protection, see Chapter 4.12. The best short-circuit protection is achieved by using fuses. The
short-circuit protection must be on the input side when seen from the LCL filter, Figure 8.
A cable or busbar designed for the purpose must be used to make the connection. The connection
must be dimensioned according to the nominal current rating of the Active Front End unit. The
necessary overloading allowance must also be used. The connection must also have the same
short-circuit capacity as the whole system. The connecting cable or busbar may be of copper or
aluminium. When aluminium is used, steps must be taken to prevent corrosion. The dimensions of
the terminals in the unit are indicated in Appendix 82 and their locations are shown in Appendix 73,
Appendix 74 and Appendix 75. Locations of terminals in the LCL filter are shown in Appendix 76 and
Appendix 77.
5.3.2
DC connection
The DC connection of the Active Front End unit is connected to the terminals at the top. The
terminals are marked as B+ for connection to DC+ and B- for connection to DC-. The DC connection
must be protected using DC fuses, see Chapter 4.11. The terminal dimensions are shown in
Appendix 82.
5.3.3
LCL filter Fan power supply
Two types of power supplies are available for the LCL filter cooling fan. The cooling fan can be
supplied from an external power supply or an integrated DC/DC power supply.
5.3.3.1
LCL filter with integrated DC/DC power supply for fan
The DC/DC power supply is integrated in the structure of the LCL filter, Figure 44 and Figure 45.
The integrated DC/DC power supply takes its input voltage from the intermediate circuit,
Appendix 79. The input of the DC/DC power supply must be protected against short circuit using DC
fuses type Ferraz Shawmut ATQ8 (8 A) if the length of the supply cable does not exceed 2 m. The
fuses can be installed in holders type Ferraz Shawmut US102I (2-pole), to allow the easy
disconnection of the DC/DC power supply from the supply. If the length of the supply cable exceeds
2 m, fuses type Ferraz Shawmut D100gRB008VI (8 A) must be used. The fuses should be installed
in holders.
The high DC voltage must be taken into account when wiring the supply; suitable cables/leads must
be used.
The DC/DC power supply is monitored and controlled by the Active Front End unit. The DC/DC power
supply connections are shown in Figures 44 - 45 and Appendix 79 and Appendix 80.
The control connection has to be taken from the Active Front End unit. The control cable has to be
connected to the terminal X51 on the LCL filter, see Figure 44 and Figure 45. The control cable has
to be connected to the terminal X3 on the Active Front End unit, see Figure 47. The terminal X3 can
be found under the black cover. In the FI13, the terminal X3 is located in the left-most unit. The
delivery includes the cable for the control connection. The length of the standard cable is 1,6 m.
The over-temperature protection can be wired directly to the control unit or to the DC/DC power
supply. The over-temperature protection must be connected to protect the filter for protect the
filter in case of over-temperature.
NOTE!
By default, the over-temperature protection is not activated. If it is not activated, the LCL can
be damaged in case of over-temperature.
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