Toshiba G8000 Series, Installation And Operation Manual, Page: 58 / 120

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G8000 Series Installation and Operation Manual
11.7.4 Grounding Configuration (with corner-grounded delta-input)
If one phase of delta-input source is grounded (B-phase for example), the ground bus in the UPS cabinet
should NOT be connected to the neutral terminal of UPS output.
The jumper cable should be removed see Figure 11.17 for the jumper cable location.
During normal operation the UPS output is floating relative to the ground. An isolation transformer is
recommended at output distribution as shown in Figure 11.20.
FIGURE 11.20 - GROUNDING CONFIGURATION WITH CORNER-GROUNDED DELTA-INPUT.
N
G
3 φ
3 φ
3 φ
N
G
< UPS Cabinet >
N
3 φ
3 φ
G
Input Source
Remove
Jumper Cable
G
N
3
φ
To the
Load
N
G
3
φ
3
φ
3 φ
N
G
< UPS Cabinet >
N
3
φ
3
φ
G
Input Source
Jumper Cable
Remains in Place
G
N
3 φ
To the
Load
N
G
3
φ
3
φ
3
φ
N
G
< UPS Cabinet >
3
φ
3
φ
G
Input Source
Jumper Cable
Remains in Place
G
N
3
φ
To the
Load
N
G
3
φ
3
φ
3
φ
N
G
< UPS Cabinet >
G
N
3 φ
3
φ
To the
Load
Output Distribution
3
φ
3
φ
G
Input Source
B
φ
Remove
Jumper Cable