!
2-41
•
Input Transformers for 12-pulse Rectification
Refer to the following table to select the input transformer for 12-pulse rectification. Refer to the mini-
mum currents on the secondary winding side in the table when selecting two standard transformers
used in combination for 12-pulse rectification.
Inverter model
3G3HV-
Input voltage (V)
Minimum current on
the primary winding
side (A)
Minimum current on
the secondary winding
side (A)
B4185
I/O voltage ratio: 1:1
52
26
B4220
380 to 460 V
±
10%/
±
66
33
B4300
380 to 460 V
±
10% at
82
41
B4370
50/60 Hz
100
50
B4450
120
60
B4550
180
80
•
12-pulse Rectification Effect
Harmonics are suppressed effectively with 12-pulse rectification as shown in the following table.
Harmonic suppres-
Harmonic generation rate (%)
sion method
5th har-
monic
7th har-
monic
11th
harmon-
ic
13th
harmon-
ic
17th
harmon-
ic
19th
harmon-
ic
23th
harmon-
ic
25th
har-
monic
No reactor
65
41
8.5
7.7
4.3
3.1
2.6
1.8
12-pulse rectification
5.43
5.28
5.40
5.96
0.69
0.19
1.49
1.18
H
Connecting the Braking Resistor
•
Connect the braking resistor as shown in the following diagram.
•
When using a Braking Resistor for the 3G3FV, set L8-01 to “1” (i.e., overheating protection of the brak-
ing resistor) and set L3-04 to “0” (i.e., no decelerating stall prevention).
•
For the 3G3HV, set n079 (braking resistor overheating protection) to “1” and n070 (no decelerating
stall prevention) to “0.”
Inverter
Braking resistor
Caution
The braking resistor’s connection terminals are B1 and B2. Do not connect any other
terminals. Connecting any terminals other than B1 or B2 can cause the resistor to
overheat, resulting in damage to the equipment.
Installation
Chapter 2
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