Xtreme Power Conversion Corporation
R91 User’s Manual
Page 7
Uninterruptible Power Supply
Introduction
The information provided in this manual covers three-phase 20kVA uninterruptible power systems, its basic func-
tions, operating procedures, options available and emergency situations. It also includes information on how to
ship, store, handle, and install the equipment. Only detailed requirements of the UPS units are described herein,
and installation must be carried out in accordance with this manual. Electrical installation 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.
Product Description
Many different kinds of sensitive electrical equipment can be protected by an Uninterruptible Power Supply (UPS)
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 exists in many forms, causing problems in AC power, from lightning, power company ac-
cidents and radio transmission motors, air conditioners, and vending machines. Protection of sensitive electrical
equipment is vital to protect against power outages, low or high voltage conditions, slow voltage fluctuations,
frequency variations, differential and common-mode noise, transients, etc.
To prevent power line problems from reaching critical systems causing damage to software, hardware, and equip-
ment malfunctions, the UPS maintains constant voltage, isolating critical load output and cleaning the utility AC
power.
Main Features
This is a three phase input / three phase output high-frequency online UPS. The UPS protects against power fail-
ures, power sag, power surge, under-voltage, over-voltage, line noise, frequency variations, switching transients,
and harmonic distortion which can all cause critical problems to supported sensitive electronic equipment in the
market today.
Functions and Features
• 3 phase input/output high-density UPS
• Digital Control
o The UPS is controlled by Digital Signal Processor (DSP) which increases reliability, performance,
self-protection, self-diagnostics, etc.
• Modular Design
• Battery Configuration
o The battery voltage can be configured based on needs
• Charging Configuration
o The charging current can be customized to meet site requirements
• Intelligent Charging Method
o 1st stage = high current constant current charging to restore batteries to 90% capacity
o 2nd stage = constant current charging to assure batteries remain fully charged
o 3rd stage = float charge
The 3-stage charging method extends the life of the batteries and guarantees rapid recharging
• LCD Display
o Both LED and LCD displays allow for ease of use and availability of critical UPS status and opera-
tional parameters, including: input/output voltage, frequency and load %, battery %, ambient tem-
