Xtreme Power Conversion Corporation
T90 User’s Manual
Page 9
Uninterruptible Power Supply
Efficiency Optimizer Function
The Efficiency Optimizer function is a new feature for the UPS adding cost effectiveness, minimizing power loss
and reducing power consumption. Alternating between bypass and on-line modes is achieved automatically and
in accordance with the conditions of the utility power. On-line mode may be used during times of intermittent
power supply, and bypass mode when power flows smoothly in order to obtain greatest efficiency. Irregularities
can be detected in less than a second, and on-line mode reactivated immediately. Switching back to online mode
occurs when input voltage is outside ±10% or nominal (±15% selectable), when input frequency is outside of ±3Hz
or when no input line is available.
Although high efficiency is standard, the default operation is in on-line mode. Bypass can be activated in the LCD
panel, though on-line can be run permanently if preferred.
Free Run Mode
The UPS operates in free run mode when input frequency is outside of the selected input frequency range. Free
run mode is when output frequency does not match input frequency. When starting the UPS, the frequency regu
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lation detected is 50 or 60 Hz ±0.25Hz. Please refer to chapter 7.2 if you want bypass available while running in
free run mode.
Diagnostic Tests
When you start the UPS, a diagnostic test is automatically executed that checks electronics, battery, and reports
any problems on the LCD display.
An advanced battery management system always monitors the conditions of the batteries sends any fore warn
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ings if replacement is needed. Otherwise every 30 days of normal mode operation, a battery discharge test is
performed and any problems reported on the LCD display.
Except during the first 24 hours after startup while the UPS is in charging mode (please see chapter 7.2), diagnostic
tests can be performed manually from the front panel at any time.
System Configuration
The UPS device and the internal backup battery make up the system. Depending on the site and load requirements
of the installation, certain additional options are available as a tailored solution.
Planning a UPS system, the following should be taken into consideration:
• The total demand of the protected system shall dictate the output power rating (VA). Allow a margin for
future expansion or calculation inaccuracies from measuring power requirements.
• Backup time needed will indicate the battery size needed. If load is less than the UPS nominal power rating
then actual backup time is longer.
• The following options are available:
• External Battery Cabinets
• Transformer cabinets
• Maintenance bypass switches
• Connectivity options (relay card, SNMP/WEB card)
