Danfoss VLT Series Design Manual page 110

5. How to Install
5.4. Additional Connections
5.4.1. 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.
5
5.4.2. Brake Connection Option
The connection cable to the brake resistor
must be shielded/armored.
1.
2.
5.4.3. Relay Connection
To set relay output, see par. group 5-4* Re-
lays.
110
NOTE
Dynamic brake calls for extra equipment and safety considerations. For further in-
formation, please contact Danfoss.
Use cable clamps to connect the shield to the metal cabinet of the adjustable frequency
drive and to the decoupling plate of the brake resistor.
Dimension the cross-section of the brake cable to match the brake current.
NOTE
Voltages of up to 975 V DC (@ 600 V AC) may occur between the terminals.
NOTE
If a short circuit in the brake IGBT occurs, prevent power dissipation in the brake
resistor by using a line switch or contactor to disconnect the line power from the
adjustable frequency drive. Only the adjustable frequency drive should control the
contactor.
MG.11.B4.22 - VLT
No 81 82 Brake resistor
.
R- R terminals
+
No 01 - 02 make (normally open)
.
01 - 03 break (normally closed)
04 - 05 make (normally open)
04 - 06 break (normally closed)
® is a registered Danfoss trademark.
VLT ® HVAC Drive Design Guide