5
vacon • 70
Installation
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
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 6. 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 6.
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 86 and their locations are shown in Appendix 77,
Appendix 78 and Appendix 79. Locations of terminals in the LCL filter are shown in Appendix 80 and
Appendix 81.
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 86.
5.3.3
Cable installation and the UL standards
To meet the UL (Underwriters Laboratories) regulations, a UL-approved copper cable with a
minimum heat-resistance of 90 C must be used.
Use Class 1 wire only.
The units are suitable for use on a circuit capable of delivering not more than 100,000 rms
symmetrical amperes, 600 V maximum, or equivalent when protected by class J, T or
Semiconductor fuses.
5.3.4
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.
5.3.4.1
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 41 and Figure 42. The
integrated DC/DC power supply takes its input voltage from the intermediate circuit,
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 DC- power supply should be wired from the AFE power module DC-connectors. Wires should
be connected between the main DC- fuses and AFE module (see Figure 43). With FI13, the power
supply can be taken from the V- phase.
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