Installation manual

ManualsBrandsAPC Manualselectrical equipment & suppliesG7TUPS250

34020846EN/AE - Page 6

Contents

1. Installation

1.1 Possible installations............................................................................................................................9

Single or modular UPS alone ...............................................................................................................9

Parallel UPS systems ...........................................................................................................................9

Modular UPSs in parallel .............................................................................................................9

Modular UPSs in parallel with external bypass cabinet ...............................................................9

Parallel UPSs with SSC (static-switch cabinet) .........................................................................10

Parallel UPSs with SSC and SSC maintenance cabinet ...........................................................10

UPS set up as a frequency converter .................................................................................................11

Single UPS ................................................................................................................................ 11

Parallel UPS systems ................................................................................................................11

1.2 Layout...................................................................................................................................................12

Dimensions .........................................................................................................................................12

Weights ..............................................................................................................................................12

Floor mounting ...................................................................................................................................13

UPS cabinets ...........................................................................................................................13

SSC ...........................................................................................................................................13

External bypass or SSC maintenance cabinets ........................................................................14

Auxiliary cabinets (empty) ........................................................................................................15

Backfeed cabinet .....................................................................................................................15

Position in room ..................................................................................................................................16

UPS cabinets ...........................................................................................................................16

SSCs .........................................................................................................................................16

External bypass cabinets ..........................................................................................................16

Battery / auxiliary cabinets ........................................................................................................16

Ventilation ...........................................................................................................................................17

UPS cabinets ............................................................................................................................17

SSCs .........................................................................................................................................17

1.3 Prerequisites........................................................................................................................................18

UPS currents ......................................................................................................................................18

Recommended upstream protection ..................................................................................................18

Normal AC source ...................................................................................................................18

Bypass AC source ...................................................................................................................18

Recommended maximum downstream protection ............................................................................19

Battery protection ...............................................................................................................................19

Recommended residual-current protection ........................................................................................19

Characteristics of the connection terminals ........................................................................................20

UPS cabinets ............................................................................................................................20

SSCs, SSC maintenance, External bypass cabinets ................................................................20

Power cables for single UPSs ............................................................................................................20

Power cables for parallel UPSs ..........................................................................................................21

Normal AC line and battery .......................................................................................................21

Bypass AC line and load ...........................................................................................................21

1.4 System earthing arrangements..........................................................................................................24

Single UPS .........................................................................................................................................24

TNS upstream, TNS downstream .............................................................................................24

TNC upstream, TNC, TNS or TT downstream installation ........................................................25

IT upstream, IT downstream .....................................................................................................25

Parallel UPS systems .........................................................................................................................25