Toshiba G8000 SERIES Installation And Operation Manual page 57

Input Source
11.7.2 Grounding Configuration (without input neutral)
< UPS Cabinet >
3 3
φ φ
When the input source is wye-connected, the neutral line out to the bypass input should be left open. The
N
UPS is grounded by connecting the neutral terminal to the ground bus with the internal jumper cable. See
N
3
φ
Figure 11.18.
3
φ
The jumper cable should stay in place. See Figure 11.17 for the jumper cable location.
G
G
If a ground fault interrupter is installed, the UPS is likely to trip the interrupter during transferring to/from
the bypass circuit. It is recommended that the ground fault interrupter be set to a minimum delay of 0.5
Input Source
seconds.
< UPS Cabinet >
3 φ 3 φ
N
Input Source
N
3 φ
3 φ
3 3 φ
φ
N
G
G
N
3
φ
3
φ
G
G
Input Source
3
3 φ
FIGURE 11.18 - GROUNDING CONFIGURATION WITHOUT INPUT NEUTRAL
N
N
3
Input Source
3 φ
11.7.3 Recommended Configuration (for delta-input)
3 3
φ φ
G
G
N
If the input source is a delta-connection (3-phase 3-wire) without ground, the neutral terminal in the UPS
3
φ
cabinet must be connected to the ground bus with the internal jumper cable as shown in Figure 11.19. 3
φ
The jumper cable should stay in place. See Figure 11.17 for the jumper cable location.
G
G
Input Source
3 3
φ φ
N
3 φ
3 φ
Input Source
3 3
φ φ
G
G
N
B
φ
3 φ
3 φ
FIGURE 11.19 - GROUNDING CONFIGURATION FOR NON-GROUNDED DELTA-INPUT
G
G
Input Source
G8000 Series Installation and Operation Manual
3 φ 3
B φ
3
N
G
< UPS Cabinet >
< UPS Cabinet >
φ
φ
< UPS Cabinet >
< UPS Cabinet >
< UPS Cabinet >
< UPS Cabinet >
φ
N
φ
Remove
Jumper Cable
3 φ
N
G
3
φ
Remove
Jumper Cable
N
G
Jumper Cable
Remains in Place
3 φ
N
G
Jumper Cable
Remains in Place
3
φ
N
G
Jumper Cable
Remains in Place
3 φ
Output Distribution
N
3 φ
G
Jumper Cable
Remains in Place
3 φ
N
G
G
Remove
Jumper Cable
Output Distribution
3 φ
3 φ
N To the
Load
G
3
φ
N To the
Load
G
3 φ
To the
N
Load
G
3 φ
N To the
Load
G
3
φ
To the
N
Load
G
3 φ
N To the
Load
G
3
φ
N
To the
Load
47
3 φ