Additional Connections; Load Sharing; Installation Of Loadsharing; Brake Connection Option - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

Additional Connections

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Load Sharing

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With load sharing you can connect several frequency converter's DC intermediate circuits 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 Loadsharing

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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 Loadsharing Instructions MI.50.NX.YY.

Brake Connection Option

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The connection cable to the brake resistor
must be screened/armoured.
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.
Dimension the cross-section of the brake cable to match the brake current.
2.
NB!:
Voltages up to 975 V DC (@ 600 V AC) may occur between the terminals.
100
How to Install
MG.33.B4.02 - VLT is a registered Danfoss trademark
No. 88 89 Loadsharing
DC - DC +
No. 81 82 Brake resistor
R- R+ terminals