Delta DPH-300K, User Manual

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1 Important Safety Instructions
4. Each protective device could be a breaker or a fuse. For the protective device’s
rating current, please refer to the table below.
100kVA 150kVA 200kVA 250kVA 300kVA
200A 300A 400A 500A 630A
5. Each protective device should have the functions of over current protection, short
circuit protection, insulating protection and shunt trip feature. Please refer to the
table below for the UPS rated short-time withstand current (Icw).
100kVA 150kVA 200kVA 250kVA 300kVA
10kA 10kA 10kA 10kA 10kA
6. When selecting the protective devices, please take each power cable’s current
capacity and the system’s overload capacity (please refer to Appendix 1: Technical
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) into consideration. Besides, the short-circuit capacity of the
upstream protective devices must be equal to or larger than the capacity of the
UPS’s input protective devices.
7. Due to abnormalities in the UPS, the fault current may reach 20kA. At the time, the
UPS’s internal semi-conductor fuses will take 8 ~ 10 ms to open. Thus, the reaction
time of the upstream*
1
protective devices must be more than 10 ms so that the fuses
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able to keep supplying power to the loads.
NOTE:
*
1
For dual input application, this refers to the bypass upstream.
8. If the UPS is supplied by a power source whose neutral is grounded, each protective
device must be a 3-pole type. If the UPS is supplied by a power source whose
neutral is not grounded, each protective device must be a 4-pole type.
9. The recommended electrical rating of the input, output and backfeed protective
devices are as follows. Application of the protective devices shall be in accordance
with local installation codes.
100kVA 150kVA 200kVA 250kVA 300kVA
690V / 200A 690V / 300A 690V / 400A 690V / 500A 690V / 600A
1.3 Usage Warnings
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Before installation, wiring and working on the UPS’s internal circuits, please completely
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