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3.2. operating principle
This manual describes the installation and operating of the Uninter-
ruptible Power Supply (UPS) from KESSUPS 91RT series, as equip-
ments that can work as a single units or connected in parallel with a
maximum of two units (equipments higher than 3 kVA only).
UPS from KESSUPS 91RT series assures a maximum protection of any
critical load, keeping the power supply voltage to the loads between
the stated parameters, with no break, when a failure, fluctuation or
deterioration happen in the electrical commercial mains and with
wide range of available models (from 0,7 kVA to 10 kVA) and allow
adapting the model to the end-user needs.
Thanks to the used technology, PwM (pulse width modulation) and
the double conversion, the UPSs from KESSUPS 91RT series are com-
pact, silent and with high efficiency.
The double converter principle cancels any perturbation of the en-
ergy mains fluctuations. A rectifier converts the AC alternating cur-
rent from mains into DC direct current, which keeps both the optimal
battery charge level and supplies the inverter that at the same time
generates a sinewave AC alternating voltage ready to supply the
loads permanently. in case of input mains power supply fault, the
batteries supply clean energy to the inverter.
The design and UPS construction from KESSUPS 91RT series have
been done in accordance with the international standards.
in models up to 3 kVA, there are available iEC outlets associated to
configure groups by means of the control -lS1 and lS2-. At higher
power models available automatic protections per each outlet group
and also they have terminals to make the corresponding power con-
nection.
The complete series has connectors for USb and RS232 ports and
EPo too for an external installation by the end-user of an emergency
button, as an option. in the models from 0,7 to 3 kVA it is supplied a
dry contact to install a remote start up and shutdown of the equip-
ment (Dry-in), as well as an auxiliary contact as an alarm (Dry-out).
As an option, inside the smart slot, one of the following communica-
tion cards can be inserted: AS-400 interface or SnMP for controlling
the equipment via internet/intranet.
Models from 4 to 10 kVA, allow the parallel connection of a second
equipment of the same features for a redundant configuration or to
increase the available power. This connection can be done at any time
and it does not condition the acquisition of itself. likewise, this power
range has manual bypass.
it is possible to increase the standard back up time of the equipment by
connecting additional battery modules.
3.2.1. Main features
• True on-line with double conversion technology and output fre-
quency independent from mains.
• output power factor 0,9 and pure sinewave, suitable for almost
any kind of loads.
• input power factor > 0,99 and high general efficiency (between
0,87 and 0,9 for models 0,7 to 3 kVA and > 0,93 for higher power
rates). it is obtained both a higher energy saving and lower cost
of installation to the end-user, as well as low input current distor-
tion, therefore the pollution in the power supply is minimised.
• High adaptability to the worst conditions of the input mains.
wide input voltage range, frequency range and wave shape, so
it is avoided the excessive dependence of the limited energy of
the battery.
• Availability of the extended back up times, by adding additional
battery modules.
• Possibility to connect two equipments in parallel (models with
power rate higher than 3 kVA only).
• High efficiency mode > 0,95 selectable (ECo-MoDE). Energy
saving, which revert to the user in an economic way.
• Possibility to start up the equipment without mains or battery
discharged. be careful with the last aspect, because the back up
time will be decreased as much they are discharged.
• The technology of smart battery management is very useful to
extend the battery lifetime and to optimise the recharging time.
• Standard communication options through RS-232 or USb ports.
• Remote emergency power off control (EPo).
• Control signal of remote emergency power off (EPo).
• interface between user and equipment through the control
panel lCD and led indicators.
• Available option connectivity cards to improve the communica-
tion capacity.
• Simplified maintenance, which allows replacing the batteries in a
secure way without shutdown the UPS.
• installation of the rack or tower equipment, with adaptable
control panel (horizontal or vertical) to the required installation
mode.
