64 Chapter 6 Battery
NX UPS Single Module And Parallel System 250kVA ~ 800kVA User Manual
Table 6-2 Number of batteries
Parameter
380V/400V/415V
Number of cells (standard)
240 pcs
End of discharge voltage
1.67Vdc/Cell ~ 1.90Vdc/Cell
Float charging voltage
2.2Vdc/Cell ~ 2.3Vdc/Cell
6.6 Battery Protection
The battery is connected to the UPS through the BCB. The BCB can be manually closed and has the 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 shall be installed as close to the battery as possible, and the wiring distance of the power and signal
cables connected to the UPS shall be minimized.
Isolation from battery to achieve safety and reliability
Short circuit protection
Automatic opening in the event of inverter lockup due to battery undervoltage to prevent battery damage caused
by overdischarge
Tripping by remote EPO button if installed
To achieve the required autonomy time, it may be necessary to parallel battery strings. In which case, the battery
circuit breaker should be placed downstream of all
parallel battery strings.
Note
Only trained personnel shall operate and maintain the BCB.
6.7 Battery Installation And Connection
6.7.1 Battery Installation
1. Before installation, check the battery appearance to ensure that there is no damage, inspect and count the
accessories, and carefully read this manual and the user manual or installation instruction provided by the battery
manufacturer.
2. There shall be a clearance of 10mm between the vertical sides of the batteries for the smooth flow of the air
around the batteries.
3. Certain clearance shall be maintained between the battery top and the underside of the layer above it to facilitate
battery monitoring and maintenance.
4. The batteries shall be installed from the bottom layer upwards to avoid high gravity center. The battery shall be
properly installed and protected from vibration or shock.
5. Measure the battery voltage, and calibrate the battery voltage after UPS startup.
6.7.2 Battery Connection
1. When the battery cabinet is installed on raised floor, the battery power cables and BCB control cables can enter
the UPS cabinet through the cabinet bottom. If the UPS and battery cabinet are installed side by side on a solid floor,
these cables can be led into the UPS cabinet through the cable entry holes on the lower part of the battery cabinet.
2. When multiple battery strings are used, they shall be connected in series and then in parallel. Before applying load
and power-up, be sure to measure the total voltage of the battery strings and make sure that it is correct. The
negative and positive terminals of the battery must be connected to the corresponding negative and positive battery
terminals of the UPS according to the labels on the battery and UPS. Reverse battery connection may cause
explosion, fire, battery damage, UPS damage, and personal injury.
3. After connecting the battery cables, install an insulating shroud for each terminal.
4. When connecting the cables between the battery terminals and the BCB, connect from the BCB side first.