APC G5USV040P005SAIO Datasheet download pdf (Page 18)

34001813EN/AF - Page 18

2. Installation

TNC upstream, TNC,TNS or TT downstream

For separate Normal AC and Bypass AC lines from a single source

Installation with IT upstream and IT downstream

For separate Normal AC and Bypass AC lines from a single source

Installation with upstream TT and downstream TT (with upstream differential protection)

For separate Normal AC and Bypass AC lines from the same source

The upstream differential rating must be at least 3A, and conditions defined in IEC 364-4-41 must be respected.

1.the UPS internal PEN bar must be connected to the Q4S neutral upstream of Q4S

2.The UPS internal PEN bar must be connected to the Q5N neutral downstream of Q5N

3.The UPS internal PE bar must be transformed into a PEN bar (cables supplied for TNC options)

In normal operating mode:

The IMD1 controls the whole installation, including downstream from the UPS. Power to the IMD2 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 IMD1 circuit and the R2 relay closes the IMD2 circuit thus maintaining control downstream of the UPS.

Normal AC

Bypass AC

Load

PEN

MLVS

PEN

Normal AC

Bypass AC

CPI2

CPI

Load

MLVS

Normal AC

Bypass AC

Load

MLVS

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APC G5USV040P005SAIO Datasheet Page 18