Lowell UPS9 Series Manual
Pg. 5
INTRODUCTION
The information provided in this manual covers single phase 1000VA, 1500VA, 2000VA, and 3000VA uninterruptible power
systems, their basic functions, 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 accidents and radio
transmission motors, air conditioners, and vending machines . Protection of sensitive electrical equipment is vital to pro-
tect 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 equipment malfunc-
tions, the UPS maintains constant voltage, isolating critical load output and cleaning the utility AC power .
Double Conversion Online Technology
A double conversion on-line technology UPS provides completely isolated, clean, uninterrupted single-phase power to your
critical systems, while maintaining the batteries for their maximum potential . In the event that the power failure lasts longer than
the UPS backup time, the UPS will shut down avoiding battery damage . When the input AC voltage returns, the UPS will
automatically return online to recharge the batteries .
As shown in block diagram:
• An input filter reduces transients on the incoming utility .
• To maintain full battery charge, the AC input power is rectified and regulated in the rectifier feeding power to the battery
converter and inverter .
• DC power is converted to AC in the inverter, passing it on to the load .
• Power is maintained from the battery during a power failure .
• The converter increases voltage appropriately for the inverter .
Diagnostic Tests
When the UPS is started, a diagnostic test is automatically executed, checking the electronics and batteries, reporting any
problems on the LCD display .
