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SECTION 5 | Description & Principles of Operation
TABLE 5.1 SYNCHRONIZED TYPE OF TRANSFER IN OFF-LINE MODE
Condition of AC GRID input
Operation when AC GRID input
is operating normally
Operation when AC GRID input fails and is
restored subsequently
Frequency of AC GRID
input voltage is within the
“Synchronizable Frequency
Window” determined by
the parameter “SyncFREQ”
(see Section 5.6.4)
AC GRID input will be the Primary
AC Source and the Inverter will be
the Backup AC Source.
The load will be powered by the
AC GRID input.
The frequency and phase of Inverter
voltage will be kept synchronized
with the frequency and phase of the
AC GRID input voltage .
LED marked “AC GRID Green
LED marked “INVERTER” Green
LED marked “BYPASS" Green
LED marked “ALARM” Off
AC GRID input failure
If the AC GRID input fails, the load will be
transferred to the Inverter in synchronized
manner (within < 8 ms, NOT at zero crossing)
LED marked “AC GRID Off
LED marked “INVERTER” Green
LED marked “BYPASS” Off
LED marked “ALARM” Off
AC GRID input voltage is restored
If and when AC GRID input is restored,
the frequency and phase of the Inverter
voltage will be slowly synchronized with
the frequency and phase of the AC GRID
input voltage. When synchronization is
completed, the load will be transferred
back to the AC GRID input at zero crossing
of the voltage waveform within < 8 ms
Frequency of AC GRID input
voltage is NOT within the
“Synchronizable Frequency
Window” determined by
the parameter “SyncFREQ”
(see Section 5.6.4)
AC GRID input will be the Primary
AC Source and the Inverter will be
the Backup AC Source.
As the AC GRID input is NOT within
the “Synchronizable Frequency
Window”, it will NOT be bypassed.
The load will be supplied by the
Inverter.
The frequency of Inverter voltage
will be adjusted to a value NOT
equal to but closer to value =
(“Output FREQ” + “Sync FREQ or
“Output FREQ” - “Sync FREQ”). For
example, if “Output FREQ” of the
Inverter = 60Hz, “Sync FREQ”=5
Hz and AC GRID input frequency =
50Hz, then the Inverter frequency
will be 55 Hz (60Hz – 5 Hz = 55Hz).
LED marked “AC GRID Orange
LED marked “INVERTER” Green
LED marked “BYPASS” Off
LED marked “ALARM” Off
AC GRID input failure
If AC GRID input fails, it will not matter
because the load was already being
powered by the Inverter as the AC GRID
input was NOT within the “Synchronizable
Frequency Window”.
LED marked “AC GRID Off
LED marked “INVERTER” Green
LED marked “BYPASS” Off
LED marked “ALARM” Off
AC GRID input is restored
If and when AC GRID input is restored,
the frequency of Inverter voltage will be
adjusted to a value NOT equal to but closer
to value = (“Output FREQ” + “Sync FREQ
or “Output FREQ” - “Sync FREQ”). For
example, if “Output FREQ” of the Inverter
= 60Hz, “Sync FREQ”=5 Hz and AC GRID
input frequency = 50Hz, then the Inverter
frequency will be 55 Hz (60Hz – 5 Hz =
55Hz).
The load will continue to be powered by
the Inverter at frequency closest to the AC
GRID input frequency as described above.