2-40
D Countermeasures with 12-pulse Rectification against Harmonics Generation
(Only for 3G3HV Models Larger than 18.5 kW)
• 12-pulse Rectification
The 3G3HV-series Inverter with an output of 18.5 to 160 kW can employ 12-pulse rectification, which
suppresses harmonics better than reactors. The 3G3HV-series Inverter with an output of 15 kW or
less cannot employ 12-pulse rectification.
• Wiring Method
1. Terminals L1 (R) and L11 (R1), L2 (S) and L21 (S1), and L3 (T) and L31 (T1) are short-circuited with
short bars before shipping. Be sure to remove the short bars when employing 12-pulse rectification,
otherwise the Inverter will break down.
2. Do not ground the secondary winding side of the transformer, otherwise the Inverter may break
down.
With Input Transformer for 12-pulse Rectification
400 VAC
Input transformer for
12-pulse rectification
3G3HV
L1 (R)
L2 (S)
L3 (T)
L11 (R1)
L21 (S1)
L31 (T1)
T1 (U)
T2 (V)
T3 (W)
With Standard Transformers for 12-pulse Rectification
400 VAC
Star-star insulating
transformer
3G3HV
Star-delta insulating
transformer
L1 (R)
L2 (S)
L3 (T)
L11 (R1)
L21 (S1)
L31 (T1)
T1 (U)
T2 (V)
T3 (W)
Note Use insulating transformers.
Installation Chapter 2
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