Main circuit terminals (for 12-phase rectification)
39
2
2.6
Main circuit terminals (for 12-phase
rectification)
2.6.1
Details on the main circuit terminals
2.6.2
Connection diagram with 12-phase rectifier
power transformer
When using separate power supply for the control circuit, remove the jumpers from R1/L11 and S1/L21.
NOTE
• The 12-phase rectification specification is not certified as compliant with the Radio Waves Act (South Korea).
• For wiring to the control circuit terminals of the converter unit, refer to
(when the sink logic is selected) and
(when the source logic selected).
2.6.3
12-phase rectifier power transformer
For 12-phase rectification, a 12-phase rectifier power transformer (3-winding transformer) is required (customer's
purchase).
To prevent imbalances in output current from the power transformers, adjust the current as follows.
• Control imbalances in output voltage from the power transformers to within the range of
0.5%. Control an imbalance in
power impedance (%Z) to within the range of
10%.
Terminal symbol
Terminal name
Terminal function description
Refer to
page
R/L1, S/L2, T/L3
AC power input
Connect these terminals to the output terminals in the wye
connection of a 12-phase transformer (3-winding transformer).
R2/L12, S2/L22, T2/L32 AC power input
Connect these terminals to the output terminals in the delta
connection of a 12-phase transformer (3-winding transformer).
R1/L11, S1/L21
Power supply for the
control circuit
Connected to the AC power supply terminals R/L1 and S/L2. To
retain the fault display and fault output, remove the jumpers across
terminals R/L1 and R1/L11 and across S/L2 and S1/L21, and apply
external power to these terminals.
When using a separate power supply connected to terminals R1/L11
and S1/L21, the required power capacity is 80 VA.
P/+, N/-
Inverter connection
Wire the terminals as shown in the terminal connection diagram.
(Wire one terminal P/+ to another terminal P/+, and do likewise for
terminal N/-.)
Earth (ground)
For earthing (grounding) the converter unit chassis. Be sure to earth
(ground) the converter unit.
Three-phase
AC power
supply
MCCB
Jumper
R/L1
S/L2
T/L3
R1/L11
S1/L21
MC
Main circuit
Earth
(Ground)
Main circuit terminal
Control circuit terminal
Inverter
N/-
P/+
DC reactor
EMC filter
ON/OFF
connecter
ON
OFF
ON
OFF
N/-
P/+
MCCB
R2/L12
S2/L22
T2/L32
MC
Inrush current
limit circuit
Power circuit for
control circuit
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