Additional Connections - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

Additional Connections

DC bus connection
The DC bus terminal is used for DC back-up, with the intermediate circuit being supplied from an external
source.
Terminal numbers: 88, 89
Please contact Danfoss if you require further information.
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!
DC bus and load sharing calls for extra equipment and safety considerations. For further in-
formation, see Load sharing Instructions MI.50.NX.YY.
NB!
Voltages up to 975 V DC (@ 600 V AC) may occur between the terminals.
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,
please contact Danfoss.
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.
NB!
If a short circuit in the brake IGBT occurs, prevent power dissipation in the brake resistor by
using a mains switch or contactor to disconnect the mains for the frequency converter. Only
the frequency converter shall control the contactor.
How to Install
®
MG.33.B8.02 - VLT is a registered Danfoss trademark
No 81 82 Brake resistor
.
R- R+ terminals
99