SAMLEX AMERICA INC. | 23
SECTION 5 |
Description & Principles of Operation
5.6.6 Unsynchronized Type of Transfer
5.6.6.1 Unsynchronized Type of Transfer in Off-Line Mode: Under this condition, AC GRID input is the
Primary Source and the Inverter is the Backup Source. Please refer to information in Table 5.3 below related
to this condition:
TABLE 5.3 UNSYNCHRONIZED 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 may or
may NOT be 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.
Frequency of AC GRID input will be
checked if within the “Synchronizable
Frequency Window”. AC GRID
input will be bypassed to the load
even if its frequency is not within
“Synchronizable Frequency Window”
Inverter output frequency will be
FIXED at the programmed value of
parameter “Output FREQ” (Default
value is 60Hz).
LED marked “AC GRID"
Green/
Orange*
LED marked “INVERTER”
Green
LED marked “BYPASS”
Green
LED marked “ALARM”
Off
* Green if AC GRID input frequency is
within the “Synchronizable Frequency
Window” determined by the parameter
“Sync FREQ” (see Section 5.6.4).
* Orange if AC GRID input frequency is NOT
within the “Synchronizable Frequency
Window” determined by the parameter
“Sync FREQ” (see Section 5.6.4).
AC GRID input failure
If AC GRID input fails, the load will be
transferred to the Inverter operating at
the programmed value of parameter
“Output FREQ” (Default value is 60Hz).
LED marked “AC GRID"
Off
LED marked “INVERTER”
Green
LED marked “BYPASS”
Off
LED marked “ALARM”
Off
Inverter is reset is restored
If and when AC GRID input is restored,
its frequency is not checked because the
synchronization process is switched off.
The load is transferred back to the AC
GRID input.
