Toshiba G8000 SERIES Installation And Operation Manual page 58

Input Source
3 φ 3 φ
N
11.7.4 Grounding Configuration (with corner-grounded delta-input)
3 φ
3 φ
If one phase of delta-input source is grounded (B-phase for example), the ground bus in the UPS cabinet
G
G
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.
Input Source
3 3
φ φ
N
B
φ
3
φ
3
φ
G
G
FIGURE 11.20 - GROUNDING CONFIGURATION WITH CORNER-GROUNDED DELTA-INPUT.
48
< UPS Cabinet >
< UPS Cabinet >
Remains in Place
3 φ
N
G
Jumper Cable
Remains in Place
Output Distribution
3
φ
3
φ
N
G
G
Remove
Jumper Cable
G8000 Series Installation and Operation Manual
3
φ
N To the
Load
G
3 φ
N
To the
Load