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.
5.4.2. Brake Connection Option
The connection cable to the brake resistor
must be screened/armoured.
No
.
81 82 Brake resistor
R- R
+
terminals
NB!
Dynamic brake calls for extra equipment and safety considerations. For further in-
formation, 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 fre-
quency converter. Only the frequency converter shall control the contactor.
5.4.3. Relay Connection
To set relay output, see par. group 5-4* Re-
lays.
No
.
01 - 02 make (normally open)
01 - 03 break (normally closed)
04 - 05 make (normally open)
04 - 06 break (normally closed)
VLT
®
HVAC Drive Design Guide
5. How to Install
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
99
5
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