Specifications

62
SENSITIVE SUPPLY COMPATIBLE
For power supply sources that are
particularly sensitive to harmonics
(generator sets or transformers of low
power with respect to that of the UPS) it
is often a good idea to take action to
limit the harmonics injected back into the
supply by the UPS.
SENTRY MULTISTANDARD series is also
available with built-in active filter using
high frequency Isolated Gate Bipolar
(IGBT) Technology with Digital Signal
Processor (DSP) control. The Active
Filter helps to reduce harmonics
generated by the UPS into the supply
which could disrupt the operation of
downstream generators and
transformers whose rating is closely
matched to that of UPS.
Sentry Multistandard with Active Filter
(internal view)
UPS input current
with optional Active Filter
• advanced technology
The active filter reduces harmonic
distortion of the phase and neutral
currents. The Digital Signal Processor
(DSP) and the “current mode” instantly
control and monitor the input current to
maintain a perfect sinewave with less
than 4% harmonic distortion
• maximum efficiency
Thanks to the active filter Sentry
Multistandard systems have low input
distortion even at low loads and their
overall efficiency is not affected by
generator frequency variations or line
impedance
• reduction of neutral current
The active filter reduces the input
neutrals current by up to 3.5 times
their nominal rating to help avoid
oversizing input protections and
conductors
• maximum reliability
Sentry Multistandard systems are
extremely reliable. Overall UPS
performance is unaffected should the
harmonic filter fail
• excellent capabilities
Input distortion: (THDi) 4%
Input power factor: >0.99
Sentry Multistandard can also be
supplied without the Active Filter
for installations less sensitive to
current harmonics.
OTHER CHARACTERISTICS
• Suitable for powering capacitive loads
such as blade servers, without any
reduction of the active power, from 0.8
leading to 0.8 lagging
• High level diagnostics: event log with
128 messages, states, measurements
and alarms - available from the built-in
LCD in several languages
• Reduced noise levels: high frequency
inverter bridge
• Back feed protection standard: to
avoid energy feeding back into the
mains supply (in compliance with CEI
11-20; DK5600)
• Power factor correction (input power
factor, close to 1)
• By pass may be deactivated to allow
operation as a frequency converter (at
50 or 60 Hz)
• Emergency operation: the UPS can be
set to operate only when the mains
fails (for emergency lighting)