IV306E Rev. 004 Siel S.p.A.
Page 33 of 37 + 12 Tables, 14 F FR
Issued date: 2014-03-24
Attention must be given to the fact that the table envisages fitting one option at a time in the machine;
in the event of several options being adopted, it will be necessary to check from time to time whether
these can be housed inside the same cabinet and whether additional containers are required.
Option 1: Filtri RFI
All the SIEL UPS units comply with European EN 62040-2 (EN50091-2) standard on electromagnetic
compatibility.
Filters that comply with more stringent regulations are available on request.
Option 2: Input Power factor correction
A power factor correction circuit can be supplied for the current absorbed by the UPS rectifier at
cos
ϕ
= 0.9 for those applications where there is no centralised power factor correction.
A dedicated magneto-thermal breaker isolates the power factor correction circuit in the event of
breakdown, thus ensuring the reliability of the system remains unaffected.
Option 3: Reduction of distortion of input power for six-phase UPS
As an alternative to the twelve-phase solution, the distortion of the current absorbed by the system
from the six-phase bridge by 29 to 10% can be reduced by adding special filters. The use of such filters
also permits input power factor correction.
A dedicated magneto-thermal breaker isolates the filter in the event of breakdown, thus ensuring the
reliability of the system remains unaffected.
Option 4: Reduction of input current distortion for 12-pulse UPSs
This option makes it possible to lower distortion of the input current from the twelve-pulse bridge from
10% to 7%.
It is possible to achieve even lower levels of distortion by means of option 27 or customized solutions
(in the latter case, please contact SIEL S.p.A.)
Option 5: Reserve mains isolation transformer
The UPS unit can be completed with a class H isolation transformer for the reserve mains with
electrostatic screen. In this case the load remains totally isolated with respect to the input mains.
Option 6: Rectifier input isolation transformer
The UPS unit can be supplied with a class H isolation transformer for the rectifier input with
electrostatic screen. In this case, the battery remains completely isolated with respect to the input
mains.
Option 7: Rectifier and reserve input isolation transformer
If the input mains to the rectifier and the reserve mains are joined, the UPS unit can be supplied with a
class H isolation transformer that completely separates the inputs from the UPS units. This way the
load and battery remain completely isolated with respect to the input mains.
By means of this transformer, it is also possible to adapt the input voltage of the UPS units to non-
standard values (also see option 21).
Option 8: Remote switch for disconnecting the reserve mains in case of a mains power
break and UPS output isolation sensor
The UPS unit can be equipped with an input remote switch and isolation sensor for controlling the
system in IT during a mains power failure.
Option 9: Back-Feed to Mains Protection with switch in the UPS
As a rule, in case of static switch fault, the “Back-Feed Protection” permits the activation of the release
coil of an switch mounted in the UPS in order to avoid any danger for people working on the system.
Alternatively, by means of this option, the device may be used to stop UPS operation.
