Additional Connections - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

6.5. Additional Connections

6.5.1. 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.
6.5.2. 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.
6.5.3. Brake Connection Option
The connection cable to the brake resistor
must be screened/armoured.
1.
2.
NB!
DC bus and load sharing calls for extra equipment and safety considerations. For
further information, see Load sharing Instructions MI.50.NX.YY.
NB!
Voltages up to 975 V DC (@ 600 V AC) may occur between the terminals.
NB!
Dynamic brake calls for extra equipment and safety considerations. For further in-
formation, please contact Danfoss.
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.
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 fre-
quency converter. Only the frequency converter shall control the contactor.
MG.33.B9.02 - VLT ® is a registered Danfoss trademark
No 81 82 Brake resistor
.
R- R terminals
+
6. How to Install
6
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