Additional Connections; Load Sharing; Installation Of Load Sharing; 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 several adjustable frequency drives' DC intermediate circuits can be connected together
which will extend the installation if extra fuses and AC coils are used (see illustration).
NOTE
Load sharing cables must be shielded/armoured. If an unshielded/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

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The connection cable must be shielded and the maximum length from the adjustable
frequency drive to the DC bar is 82 ft (25 m).
NOTE
Load sharing calls for extra equipment. For further information, see Load-
sharing Instructions MI.50.NX.YY.

Brake Connection Option

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The connection cable to the brake resistor
must be shielded/armored.
Use cable clamps to connect the shield to the metal cabinet of the adjustable frequency
1.
drive and to the decoupling plate of the brake resistor.
Dimension the cross-section of the brake cable to match the brake current.
2.
How to Install
MG.33.B3.22 - VLT is a registered Danfoss trademark
No. 88 89 Loadsharing
DC DC +
No. 81 82 Brake resistor
R- R+ terminals
101