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4
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 utility power irregularities. The bypass mode should be used when power flows
smoothly in order to obtain the greatest efficiency. Irregularities can be detected in less
than a second and the on-line mode can be reactivated immediately. Switching back to
online mode occurs when the input voltage exceeds ±10% (or ±15% selectable), when
the input frequency exceeds ±3Hz, or when no input line is available.
Although high efficiency is standard, the default operation is the on-line mode. From
the LCD display panel, Bypass can be activated as required or On-line operation can be
run permanently if preferred.
2.3 Free Run Mode
Free run mode is a mode of operation in which the output frequency does not match
input frequency. The UPS operates in free run mode when the input frequency is outside
of the selected input frequency range. When starting the UPS, the targeted frequency is
50 or 60 Hz ±0.25Hz. Refer to Section 4.3 to set up bypass availability while running in
free run mode.
2.4 Diagnostic Tests
When the UPS is started, a diagnostic test is executed automatically that checks the
electronics and battery, and reports any problems on the LCD display.
The advanced battery management system monitors the performance of the battery and
will indicate if battery replacement is required. The battery management system tests
the battery every 30 days of normal mode operation. A battery discharge test is
performed and reports any problems on the LCD display.
Except during the first 24 hours after startup while the UPS is in charging mode,
diagnostic tests can be performed manually from the front panel when required.
2.5 System Configuration
The UPS device and the internal backup battery make up the system. Depending on the
site and load requirements of the installation, available options may be utilized to create
a tailored solution.