OPTI-UPS DS20KBT - Manual (Page 3)

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The instructions contained within this safety manual are deemed important and should be
closely followed at all times during installation and follow-up maintenance of the UPS and
batteries.
CAUTION
The unit has a dangerous amount of voltage. If the UPS indicator is on, the unit’s
outlets may have a dangerous amount of voltage even when not plugged into the
wall outlet because the battery may continue to supply power.
Care should be taken to undertake installation indoors free from
electrically-conductive particles which is under temperature and humidity control
in order to reduce the risk of electric shock.
It is best to disconnect the device using the power supply cord. Ensure that the
equipment is placed in a position near the outlet where easily accessible.
Except replacing the batteries, all servicing on this equipment must be carried out
by qualified service personnel.
Before conducting any maintenance, repair or shipment, first ensure that
everything is turned off completely and disconnected.
For additional safety instructions, please use the Safety Manual as reference.
Special Symbols
The following symbols used on the UPS warn you of precautions:
RISK OF ELECTRIC SHOCK – Please observe the warning that a risk of electric
shock is present.
CAUTION: REFER TO OPERATOR’S MANUAL - Refer to the operator’s
manual for additional information, such as important operating and maintenance
instructions.
SAFE GROUNDING TERMINAL - Indicates primary safe ground
LOAD ON/OFF - Pressing this button turns on/off the output receptacles and the
Indicator light.
Please do not discard the UPS or UPS batteries as the UPS may have valve
regulated, lead–acid batteries. Please recycle batteries.
1. Introduction
The information provided in this manual covers single phase 5000 – 20000 VA,
uninterruptible power systems, their basic functions, operating procedures, and emergency
situations, also including information on how to ship, store, handle and install the equipment.
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Only detailed requirements of the UPS units are described herein, and installation must be
carried out in accordance with this manual. Electrical installations must also carefully follow
local legislation and regulations. Only qualified personnel should conduct these installations
as failure to acknowledge electrical hazards could prove to be fatal.
2. System description
Several different kinds of sensitive electrical equipment stay protected by a UPS
(Uninterruptible Power System) including computers, workstations, process control systems,
telecommunications systems, sales terminals, other critical instrumentation, etc. The purpose
of the UPS is to protect these systems from poor quality utility power, complete loss of
power, or other associated problems.
Electrical interference abounds in many forms causing problems in AC power, from
lightning, power company accidents and radio transmissions to motors, air conditioners, and
vending machines, among others. So protection of sensitive electrical equipment is vital to
protect against power outages, low or high voltage, slow voltage fluctuations, frequency
variations, differential and common-mode noises, transients, etc.
In order to prevent power line problems reaching critical systems causing damage to
software, hardware and causing equipment to malfunction, the UPS helps by maintaining
constant voltage, isolating critical load output if needed, and cleaning the utility AC power.
2.1 General description
As a double conversion on-line UPS, it is able to supply uninterrupted, clean single-phase
power to your critical systems while keeping batteries charged continuously, regardless of
whether utility power fails or not.
In event that a power failure lasts longer than a UPS backup time, it will shut down avoiding
battery discharge, and as soon as voltage comes back, the UPS will automatically charge up
and start recharging the batteries.
As shown in fig.1 block diagram:
z An input filter reduces transients on the mains
z For maintaining full battery charge, AC-power is rectified and regulated in the rectifier
feeding power to the inverter and battery converter.
z DC power is converted to AC in the inverter passing it on to the load.
z Power is maintained from the battery during a power failure.
z The converter increases voltage appropriately for the inverter.