Additional Connections - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

6.8. Additional Connections

6.8.1. 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 used: 88, 89
Please contact Danfoss if you require further information.
6.8.2. 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.
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.
6.8.3. Brake Connection Option
The connection cable to the brake resistor must be screened/armoured.
Enclosure
Brake resistor
Terminals
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.
A+B+C+D+F
81
R-
MG.33.BA.02 - VLT ® is a registered Danfoss trademark
6. How to Install
A+B+C+D+F
82
R+
135
6