MASTER HE
SPTMHEE3T16FREN
11
6.1.
AC/DC Converter
The AC/DC Converter converts the alternate voltage into direct voltage to power the inverter at nominal load and to charge
the batteries. The input stage of
Master HE
UPS is realized with a technology such as to reduce the harmonics of current
rejected into the mains by up to 3% and increase the power factor up to the unit from 10 to 100% of the load (see the
tables with the Technical Data at the end of the present specifications).
6.1.1
Easy Source
Master HE
is designed in order to reduce at minimum the impact on the mains source or on the upstream Generator Set.
In detail the features are as follow:
•
Input Harmonics:
thanks to a low input harmonics content of the and the high power factor, the installation
costs are reduced as well as the sizing of a possible generator set upstream.
•
Power Walk-In duration:
when the input voltage is applied to the rectifier, as per example after a mains power
failure, this reaches the nominal power progressively in a programmable time from 0 to 30 seconds.
•
Power Walk-in start delay
: in parallel configurations the start-up of the rectifiers can be delayed to reduce the
impact to any generator located upstream. The delayed start-up is programmable up to 120 seconds.
Example of calibration from the rectifiers in a parallel system
•
Inhibition of the battery charge current:
while
the UPS is operating with a generator set, battery recharging
can be excluded and all the available power can be used to feed the load.
UPS1
UPS1+UPS2
UPS1+
UPS2+
UPS 3
UPS1+
UPS2+
UPS3+
UPS4
Potenza Gruppo
elettrogeno (kVA)
25 %
50 %
75 %
100 %
30
60
90
Secondi
Power of
Generator Group (kVA)
Seconds
