Additional Connections - Danfoss FC 300 Design Manual

FC 300 Design Guide

Additional Connections

Load Sharing
With load sharing you can connect several frequency converter's DC intermediate circuit s if you extend
the installation using extra fuses and AC coils (see illustration).
NB!
Load sharing cables must be screened/armoured. If an unscreened/unarmoured cable is used,
some EMC requirements are not complied with.
Voltage levels of up to 975 V DC may
occur between terminals 88 and 89.
Installation of Load sharing
The connection cable must be screened and the max. length from the frequency converter to the DC bar
is 25 metres.
NB!
Load sharing calls for extra equipment and safety considerations. For further information, see
Load sharing Instructions MI.50.NX.YY.
Brake Connection Option
The connection cable to the brake resistor must be
screened/armoured.
NB!
Dynamic brake calls for extra equipment and safety considerations. For further information,
see the Instruction Brake Resistors for Horizontal Applications, MI50SXYY.
1. Use cable clamps to connect the screen to the metal cabinet of the frequency converter and to
the decoupling plate of the brake resistor.
2. Dimension the cross-section of the brake cable to match the brake current.
NB!
Voltages up to 975 V DC (@ 600 V AC) may occur between the terminals.
90
How to Install
No.
No
.
MG.33.B7.02 - VLT is a registered Danfoss trademark
88 89 Load sharing
DC - DC +
81 82 Brake resistor
R- R+ terminals