Danfoss vlt fc 300 Instruction Manual page 30

®
VLT Automation Drive FC 300 12-Pulse
How to Install
Instruction Manual High Power
The AC line input connection is fitted to the line power
switch if this is included.
91-1 (L1-1)
6 Phase
92-1 (L2-1)
power
93-1 (L3-1)
input
91-2 (L1-2)
92-2 (L2-2)
93-2 (L3-2)
95 PE
Figure 3.21
R1 91-1
Rectifier 1
S1 92-1
T1 93-1
R2 91-2
92-2 Rectifier 2
S2
T2 93-2
95
A
R1 91-1
Rectifier 1
S1 92-1
T1 93-1
R2 91-2
92-2 Rectifier 2
S2
T2 93-2
B
95
Figure 3.22
A) Modified 6-Pulse Connection 1), 2), 3)
2), 4)
B) 12-Pulse Connection
Notes:
1) 6-pulse connection eliminates the harmonics reduction
benefits of the 12-pulse rectifier.
MG34Q222 - VLT ® is a registered Danfoss trademark
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NOTE!
The motor cable must be shielded/armored. If a non-
shielded/unarmored cable is used, some EMC requirements
are not complied with. Use a shielded/armored motor
cable to comply with EMC emission specifications. For
more information, see EMC Specifications in the Design
Guide, MG11BXYY and the FC 300 Design Guide, MG33BXYY.
See 5.1 General Specifications for correct dimensioning of
motor cable cross-section and length.
2) Suitable for IT and TN AC line input connections.
3) In the unlikely event that one of the 6-pulse modular
rectifiers becomes inoperable, it is possible to operate the
3-21
3 3