Operation Modes; Normal Operation Mode; Utility Failure Operation - GE SG SERIES 10 Operating Manual

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3.2

OPERATION MODES

3.2.1 Normal operation mode

During normal operation,
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.

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"
imminent) warns the operator that the Battery
is almost discharged and the UPS is about to
shut down.
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.
OPM_SGS_USM_10K_40K_0US_V010.doc
the Rectifier
Fig. 3.2.1-1 Block diagram normal operation mode
alarm (shutdown
Fig. 3.2.2-1 Block diagram Utility Failure operation
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Operating Manual SG Series 10, 20, 30 & 40 kVA
GE