APC 6000 Electrical parameters for selecting protective devices, Electrical parameters for Mains

Characteristics (cont.)

Electrical parameters for selecting protective devices

The parameters given in the table opposite can be used to determine the required rating of the source side protective circuit breaker on Mains 1 of a single-unit or modular UPS, a frequency converter, or a parallel UPS with SSC.

Important:

It is essential to choose the type of circuit breaker according to its breaking capacity and the prospective short- circuit current at its place of installation.

Note:

For Mains 1 power supply voltages of 380, 400 and 415V, the Mains 1 current is the same because it is a function of the DC voltage.

Electrical parameters for Mains 1

rated	Mains 1 current
inverter	rated current In for unit:		for 25%	for 50%
output	with battery at start	without battery (2)	overload (3)	overload (3)
in kVA
	of charge cycle (1)
250	447	407	509	611
300	537	490	612	734
400	727	654	818	981
450	775	735	919	1102
500	920	821	1026	1231
600	1089	981	1226	1472

(1) the rated Mains 1 currents (In) have been	(3) the Mains 1 currents given for an overload of
determined for a rated phase-to-phase voltage of	25% or 50% are maximum values. They have been
380V to 415V, a battery with a 15 minute backup	determined for a battery drawing the minimum float
time (206 cells at 2V per cell, i.e. 412V) and at the	charging voltage and a load power factor of 0.8.
beginning of its recharge cycle, and full rated load	When choosing the circuit breaker rating, use the
with a power factor of 0.8.	"rated current" column and check that the circuit
(2) the rated Mains 1 currents (In) have been	breaker tripping curves are compatible with the
determined for a minimum float charging voltage of	values in the overload columns.
423V and full rated load with a power factor of 0.8.

The parameters given in the table opposite can be used to determine the required rating of the source side protective circuit breaker on the Mains 2 line for a single-unit or modular UPS.

Important:

◗It is essential to choose the type of circuit breaker according to its breaking capacity and the prospective short- circuit current at its place of installation. This choice must also be made so as to protect the static switch semiconductors and ensure discrimination with respect to the UPS output fuses (refer to "appendix" chapter).

◗For an installation with a Static Switch Cubicle, the Mains 2 currents indicated in the table must be multipled by the number of parallel-connected rectifier-inverter cubicles required to supply the load power (i.e. without taking redundant rectifier-inverter units into account).

Remark:

If the installation includes a transformer on the Mains 2 input, allow for the inrush current caused by magnetization of the transformer windings.

Electrical parameters for Mains 2 (415V)

rated	Mains 2 current (1)
inverter output	rated current	for 25%	for 50%
in kVA	In	overload	overload
250	347	433	519
300	416	519	624
400	556	695	834
450	649	811	973
500	722	902	1083
600	866	1082	1300

(1)the Mains 2 currents have been determined for a rated phase-to-phase voltage of 415V, a load power factor of 0.8 and for full rated load as well as overloads of 25% or 50%. When choosing the circuit breaker rating, use the "rated curent" column and check that the circuit breaker tripping curves are compatible with the data in the overload columns. For a Mains 2 voltage of 380V, multiply the currents indicated in this table by 1.09.

For a Mains 2 voltage of 400V, use the table in another language version of this manual.

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