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Installation of the External Battery Cabinet’s Protective Device
Please follow your UPS rating to install an appropriate protective device for each external
battery cabinet. There are four installation methods for selection.
(1) A 4-pole DC isolated switch connected in series with DC fuses
(2) A 3-pole DC isolated switch connected in series with DC fuses
(3) A 4-pole DC circuit breaker connected in series with optional DC fuses
(4) A 3-pole DC circuit breaker connected in series with optional DC fuses
For relevant values, please refer to
Table 5-4
. for installation diagrams, please refer to
Figure 5-48 ~ Figure 5-51
.
Table 5-4: External Battery Cabinet’s Protective Device
(Default Battery Q’ty: 12Vdc × 40 PCS)
UPS Rating
Protective
Device’s Current
Protective Device’s Voltage
300kVA/ 300kW 1000A
4-pole DC isolated switch/ DC circuit
breaker: voltage per pole ≥ 250Vdc.
3-pole DC isolated switch/ DC circuit
breaker: voltage per pole ≥ 500Vdc
DC fuse: voltage ≥ 500Vdc
400kVA/ 400kW 1250A
500kVA/ 500kW 1400A
600kVA/ 600kW 1700A
NOTE:
1.
Table 5-4
is for 12Vdc × 40 PCS of the batteries (default). If you install a
different number of batteries, please contact Delta service personnel for
protective device’s current and voltage values.
2. If you need to parallel multiple units of external battery cabinets, please contact
Delta service personnel for relevant information.
3. To extend the backup time, you can parallel up to four units of external battery
cabinets to the UPS. Please note that (1) the number of the batteries in each
paralleled external battery cabinet and (2) the cable length of each battery
string must be the same.
• When choosing the external battery cabinet’s protective device, please take the following
factors into consideration: (1) overcurrent between the UPS and battery circuit, (2) short
circuit current of the batteries, (3) wire/ cable materials, and (4) local electrical
regulations. If you have any questions about the external battery cabinet’s protective
device, please contact Delta service personnel.
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