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n UPS Systems
M0301_N_Series_DM_Manual V1.4 2012-06-12
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2.4.
Operational Features
Normal Mode
System operates within user-defined settings. The input operating range is based on
the Input Frequency Setting and the Input/Bypass Voltage Setting (Chapter 6.5). The
output is synchronized with the input until the AC supply falls outside of the
operating window, at which time the system will go the back-up mode and remain
there until the AC supply returns to the user defined operating window or the batteries
are exhausted.
Free Run Mode
The UPS synchronizes the output of the inverter with the AC supply as long as the
input frequency and voltage are within the user selected Input Frequency Setting and
the Input/Bypass Voltage Setting (Chapter 6.5). When the AC supply parameters are
outside of the selected window the inverter will lock to the frequency determined on
start-up (50 or 60Hz) and maintain that setting until the AC supply is back with
operating parameters or the batteries are exhausted. The static (or automatic) bypass
in this mode is available when the AC supply is within the selected operating
parameters. If the AC supply is outside the operating window the bypass will be
disabled (as per factory default). This function can be changed and the system can be
programmed to go to bypass without the inverter and AC supply being synchronized.
Please refer to chapter 6.5 if you want bypass available while running in free run
mode.
Efficiency Optimizer function (HE Mode see Front Display functions)
The high efficiency function adds cost effectiveness, maximizes efficiency and
reduces power consumption. Alternating between bypass and on-line modes is
achieved automatically and in accordance with the conditions of the AC supply
power. On-line mode may be used during times of intermittent power, and bypass
mode when the utility is within user selectable parameters (see Front Display
Functions) in order to obtain greatest efficiency. Irregularities can be detected in less
than a second, and on-line mode reactivated immediately. Switching back to on-line
mode occurs when input voltage is outside ±10% of nominal (± 15% selectable),
when input frequency is outside of ±3Hz or when no input utility is present.
Although high efficiency is standard, the default operation is in on-line mode. The
bypass can be activated in the LCD panel, though on-line can be run permanently if
preferred.
Generator Mode
The inverter of the UPS system is locked to the frequency determined on start-up (50
or 60Hz) within ±0.25Hz. The bypass is disabled and cannot be enabled because the
AC supply can vary independently of the output. The operating parameter for the
input is 45 to 65Hz and 60 to 144VAC (depending on load). This function is highly
recommended for any application with a generator involved or an AC supply that can
vary in frequency (VFD’s and other harmonic issues). See chapter 6.5 for
programming.
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 sending any forewarnings if replacement is needed. Otherwise every 30 days
of normal operation, a battery discharge test is performed and, if a problem arises it
will be reported on the LCD display.
