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OPM_SGS_USM_10K_40K_0US_V010.doc 12/88 Operating Manual
SG Series
10, 20, 30 & 40 kVA
3.2 OPERATION MODES
3.2.1 Normal operation mode
During normal operation, the Rectifier
converts input AC power to DC.
The DC power provides input power for the
Inverter and charging power for the Battery.
The Inverter converts the DC power to
continuous and regulated AC power, which
supplies the critical load.
The control panel reports the Battery charge
status and the expected backup time with the
actual load.
Fig. 3.2.1-1 Block diagram normal operation mode
3.2.2 Utility failure operation
When the Utility is no longer within acceptable
tolerances, the Battery will provide the DC
power to the Inverter.
The Inverter will maintain continuous AC
power to the Load until the Battery Voltage
reaches the lower limit of the Inverter
operation capability.
During the discharge, the LCD screen displays
the estimated time the Battery can support the
critical load.
Prior to the Battery completely discharging,
the "stop operation" alarm (shutdown
imminent) warns the operator that the Battery
is almost discharged and the UPS is about to
shut down.
Fig. 3.2.2-1 Block diagram Utility Failure operation
In case of parallel operation
With a parallel system for power capacity (see Section 3.3)
•
With the
Bypass Utility power available,
a low Battery warning on any unit will cause the
Load to be transferred to Utility (after a selectable time delay).
• With Bypass Utility power not available, a low Battery warning on any unit will start the
“
stop operation
” timer (adjustable).
The Load will shut down at the end of the “stop operation” time period.
With a parallel system for redundancy (see Section 3.3)
• When a Battery low warning occurs on a unit not necessary to support the present load, this
unit will shut down after a timeout period (selectable).
The Load is shared between the other units
• As the warning occurs on one unit necessary to support the present load, the system starts
the "
stop operation
" timeout (selectable).
The Load will shut down at the end of the “stop operation” time period.