MULTI SENTRY
SPTMSTD2T16EREN
8
>6.1 PFC CONVERTER (ZERO IMPACT SOURCE)
The PFC Converter converts the AC voltage into a DC supply to power the Inverter; if the mains or alternative
power supply fails, the Converter will raise the battery voltage to a value suitable with which to power the
Inverter. The PFC control technology using Digital Signal Processor (DSP) microprocessors and IGBT power
semiconductors to achieve a low impact on the power supply source, low harmonic distortion and high input
power factor. A zero impact on the supply source is achieved due to the following characteristics:
Negligible Input Harmonics:
upstream generators and transformers (including distribution) can be reduced
due to the negligible input harmonic distortion of 3% and high input power factor (> 0,99); also reduces the
size of a possible generator of the same upstream and distribution transformer MT/BT.
Delayed switching of UPS -t0-t1 (Power Walk in-start Delay):
when the mains power supply returns, the UPS
delays switching of the input stage for a period of time that can be set between 1 and 120 seconds. This
function is particularly useful when the mains power supply returns after an interruption (or when the
generator set is started) and the source must supply various UPS or, more typically, multiple users.
Progressive rectifier start-up -t1-t2 (Power Walk-in duration):
when the mains power supply returns,
absorption of the mains power supply progressively reaches the nominal value within a time period that
can be set from 1 to 125 seconds. This function is normally disabled.
