Apc GALAXY 7000 User Manual download pdf (Page 25)

System earthing arrangements >

34020846EN/AD - Page 25

1. Installation

TNC upstream, TNC, TNS or TT downstream installation

For separate normal and bypass AC lines from a single source.

IT upstream, IT downstream

For separate normal and bypass AC lines from a single source.

Parallel UPSs systems

Earthing system adaptations are the same as those previously detailed for unitary UPS.

It is essential to transform the UPS internal PE bar into a PEN bar, See “Adapting the cabinet according to the neutral point

connection”, page 26.

For an installation with a SSC cabinet or an external bypass cabinet, it is essential to transform the cabinet's internal PE

bar into a PEN bar, See “Adapting the cabinet according to the neutral point connection”, page 26.

Unit or modular UPS

The UPS output neutral must be connected to the internal PEN bar (1)

Parallel UPS with SSC cabinet or modular UPSs with external bypass cabinet:

The SSC cabinet output neutral or external bypass cabinet output neutral must be connected to the internal PEN bar for

this cabinet.

The connection between the UPS outputs and the SSC cabinet or the external bypass cabinet must be done in TNC

(connect the PEN cable to the PEN bar).

The load neutral terminal on the UPS, SSC or external bypass cabinet must not be used.

The SLT downstream TNS or TT starts on the MGE ™ Galaxy™ 7000 installation output.

In normal operating mode

The CPI1 controls the whole installation including downstream from the UPS. Power to the CPI2 is switched off by the R2

relay which controls voltage presence upstream from the UPS.

If the voltage is cut or the protection is opened upstream:

The R1 relay cuts the CPI1 circuit and the R2 relay closes the CPI2 circuit thus maintaining control downstream of the UPS.

Bypass AC

Normal AC

Q4S

Load

PEN

UPS

PFC

INV

MLVS

PEN

PE or PEN

NP:Not Provided

Bypass AC

Normal AC

CPI2

CPI1

Load

UPS

PFC

INV

MLVS

IMD2

IMD

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Apc GALAXY 7000 User Manual Page 25

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