7.5.2 Number of Batteries
The number of batteries, EOD voltage, and float charging voltage under the 380 V/400 V/415 V voltage system are
consistent, as shown in Table 7.2 below.
Param eter 380 V/400 V /4 15 V
Number of cells (standard) 168 to 264, 12-step (For derating factors refer to Electrical Characteristics (Intermediate DC Circuit) on page174
EOD voltage 1.60 Vdc/Cell to 1.90 Vdc/Cell, 1.63 V/cell recommended
Float charging voltage 2.2 Vdc/Cell to 2.3 Vdc/Cell, 2.27 V/cell recommended
Table 7.2 Nu m ber of batteries
7.6 Battery Protection
IM PO R T A N T ! Users m ust choose appropriate sw itch ing devices to p rotect the battery from short
circuit and overload , etc. W e recom m end using the Vertiv B C B to provide a m ore perfect solu tion.
The battery is connected to the UPS through the BCB. The BCB is manually closed and has an electronic tripping device
controlled by the UPS control circuit. If the battery adopts rack mounting (or is far away from the UPS cabinet), the BCB will be
installed close to the battery, and the wiring distance of the power and signal cables connected to the UPS shall be minimized.
The BCB has the following features:
• Isolation
• Short circuit protection
• In case the inverter is locked by battery under-voltage the switch automatically disconnects to avoid the damage
of battery over-discharge
• If equipped with a remote EPO button, can use the EPO button to remotely disconnect the BCB
• Protection of mis-operation
To obtain the required backup time, the batteries may be connected in parallel. In this case, each battery string must be
connected to a separate BCB.
N O T E: Only trained personnel sh all operate and maintain the battery circuit breaker.
7 Battery
116
Vertiv™ Liebert® APM Plus User Manual
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