Delta Ultron Series User Manual page 91

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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
300kVA/ 300kW
400kVA/ 400kW
500kVA/ 500kW
600kVA/ 600kW
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.
Protective
Device's Current
1000A
1250A
1400A
1700A
Protective Device's Voltage
 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
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