Installation and Operation Manual

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G8000 Series Installation and Operation Manual

11.7.4 Grounding Conguration (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 oating 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

3φ

3φ

3

φ

N

G

< UPS Cabinet >

G

N

3

φ

3

φ

To the

Load

Out

p

ut Distribution

3φ

3φ

G

Input Source

Bφ

Remove

Jumper Cable