Danfoss VLT HVAC Drive FC 102 Design Manual page 170

Electrical Installation Con...
A
B
10 10
C
A
6-pulse connection
B
Modified 6-pulse connection
C
12-pulse connection
Illustration 10.4 Connection of Mains Options for 12-pulse Drives
1) Parallel connection shown. A single 3-phase cable can be used with sufficient carrying capability. Install shorting busbars.
2) 6-pulse connection eliminates the harmonics reduction benefits of the 12-pulse rectifier.
3) Suitable for IT and TN connection of mains.
4) If 1 of the 6-pulse modular rectifiers becomes inoperable, it is possible to operate the drive at reduced load with a single 6-pulse
rectifier. Contact Danfoss for reconnection details.
5) No paralleling of mains cabling is shown here. A 12-pulse drive used as a 6-pulse should have mains cables of equal numbers
and lengths.
168
®
VLT
91-1
92-1
93-1
91-2
92-2
93-2
95
* F10/F11/F12/F13 Only
R1
91-1
S1 92-1
T1
93-1
R2 91-2
92-2
S2
T2 93-2
95
* F10/F11/F12/F13 Only
R1
91-1
S1 92-1
T1
93-1
R2
91-2
92-2
S2
T2 93-2
95
1), 2), 3)
2), 3), 4)
3), 5)
Danfoss A/S © 11/2017 All rights reserved.
HVAC Drive FC 102
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MG16C302