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3.2.4
VRLA Battery Charging Operation
As shown in Section 3.2.1, when the UPS is in normal operation, DC Power is utilized to charge the UPS
batteries. The charging characteristics of the G9400 UPS are shown in Figure 3-4 and descriptions of the two
charging periods are below.
Period (A): Charging voltage increases steadily from its minimum until it reaches the float voltage of the battery
system. During this period, the charging current will be at its maximum as long as sufficient input power is
supplied to the UPS and there are no load conditions that prevent it. The maximum current is either the Maximum
Recharge Current that the UPS system can provide (see the Battery section of Table 3–6) or a lower current limit
set via the LCD screen to comply with the battery manufacturer recommendations. This current limit adjustment
should only be performed by a Toshiba Authorized Service Provider.
Period (B): This period begins when the Charging Voltage reaches the float voltage of the batteries. The charging
current will steadily decrease as the batteries approach their maximum state of charge. Once reached, the UPS
will maintain the maximum state of charge on the batteries with minimal Charging Current.
0
3.2.5
SCiB Lithium Ion Battery Charging Operation
G9400 is Lithium Battery ready. Special settings are required per the topology of the Lithium Battery used.
Consult with Toshiba for required control wiring. Special required control settings can only be made by Toshiba
Authorized Service Provider.
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(A)
Charging Current Limit
Charging Time
Figure 3-4 Typical Battery Charging Curve
G9400 480V 1200-2000kVA Installation and Operation Manual 203078-001
(B)
Charging Voltage
Charging Current
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