Filter
Top Products
34006451EN/AC - Page 6
Characteristics
1.4 Electrical parameters for selecting protective devices
Electrical parameters for Mains 1
Electrical parameters for Mains 2 (415 V)
The parameters given in the table below 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 415 V, the Mains 1 current is the same because it is a function
of the DC voltage.
rated
inverter
output
in kVA
Mains 1 current
rated current In for unit: for 25 %
overload (3)
for 50 %
overload (3)
with battery at start
of charge cycle (1)
without battery (2)
800 1555 1329 1819 2183
900 1555 1329 1819 2183
(1) the rated Mains 1 currents (In) have been determined for a rated phase-to-phase voltage of 380 V to 415 V, a battery with a
15 minute backup time (206 cells at 2 V per cell, i.e. 412 V) and at the beginning of its recharge cycle, and full rated load with a
power factor of 0.9.
(2) the rated Mains 1 currents (In) have been determined for a minimum float charging voltage of 423 V and full rated load with
a power factor of 0.9.
(3) the Mains 1 currents given for an overload of 25 % or 50 % are maximum values. They have been determined for a battery
drawing the minimum float charging voltage and a load power factor of 0.9. When choosing the circuit breaker rating, use the
"rated current" column and check that the circuit breaker tripping curves are compatible with the values in the overload columns.
The parameters given in the table below 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.
rated
inverter
output
in kVA
Mains 2 current (1)
rated current In for 25 %
overload
for 50 %
overload
800 1155 1444 1733
900 1299 1624 1949
(1) the Mains 2 currents have been determined for a rated phase-to-phase voltage of 415V, a load power factor of 0.9 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 380 V, multiply the currents indicated in this table by 1.09.
For a Mains 2 voltage of 400 V, use the table in another language version of this manual.