APC 9000 installation manual Maintenance Bypass cubicle Mains Inverter Mains 1 mains Load

Characteristics

The table below serves as an example for an installation with up to four modular UPSs with an external maintenance bypass.

– for installations with redundant units, take into account only the units required to supply the load power

(e.g. for an installation made up of 3 parallel-connected rectifier-inverter cubicles, one being redundant, only 2 units are used to determine the currents on the maintenance bypass line and the load, and the cross-sectional areas of cables);

–this table has been drawn up for rated phase-to-phase Mains 2 and load voltages of 415 V and full rated load with a power factor of 0.9. For voltages of 380 or 400 V, multiply the indicated currents by 1.09 and 1.04 respectively, then modify the cable cross-sections accordingly if necessary.

The cable cross-sections in this table are for the parts illustrated in bold on the following block diagrams (installation example, figure 3);

–important. In an installation with an external maintenance bypass, the power cables between each UPS and the upstream protection devices must be the same length. The same holds for the power cables between each UPS cubicle and the external maintenance bypass.

rated	number of	total UPS	mains 2 or load	cable
inverter	parallel-connected	rated output	line current	cross-section (1)
output	inverters	in kVA	in Amps	in mm²
in kVA
800	2	1600	2310	Please consult us*
	3	2400	3465	Please consult us*
	4	3200	4620	Please consult us*
900	2	1800	2598	Please consult us*
	3	2700	3897	Please consult us*
	4	3600	5196	Please consult us*

(1) cable cross-sections are given for copper conductors of the U1000 R02V type (increase by 30 % for aluminium conductors). They are calculated according to permissible temperature rise and allow for line voltage drops over a maximum length of 100 m. For greater lengths, the cross-sections should be chosen to limit voltage drops to 3 %.

* NF C 15-100 authorizes a maximum of 4 cables per phase.

Installation comprising modular UPSs with an external maintenance bypass

maintenance Bypass cubicle

mains 1	inverter 1
mains 2

mains 1 mains 2

inverter 2

load

mains 1 mains 2

inverter 3

Fig. 3

34006451EN/AC - Page 9