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Important Safety Instructions
3. Each protective device could be a breaker or a fuse. For the protective device’s
rating current, please refer to the table below.
160kVA 200kVA
300A 400A
4. Each protective device should have the functions of over current protection, short
circuit protection, insulating protection and shunt trip feature.
5. 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
Specifications) 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.
6. If the UPS is supplied by a power source whose neutral is grounded, the backfeed
protective device installed as UPS input protection must be a 3-pole type. If the
UPS is supplied by a power source whose neutral is not grounded, the backfeed
protective device installed as UPS input protection must be a 4-pole type.
7. The recommended electrical rating of the backfeed protective device is as follows.
160kVA 200kVA
690V/ 300A 690V/ 400A
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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The UPS is specifically designed for information technology equipment and used to
power computers, servers, and associated peripheral devices. If you want to connect
any capacitive loads or non-linear loads (that have serious surge current) to the UPS,
it needs to be de-rated according to on-site applications. For such special applications,
please contact Delta service personnel for the accurate UPS sizing. The UPS is not
suitable for connecting with any asymmetrical loads.
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The external slits and openings in the UPS are provided for ventilation. To ensure reli-
able operation of the UPS and to protect the UPS from overheating, these slits and
openings must not be blocked or covered. Do not insert any object into the slits and
openings that may hinder ventilation.
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Before applying electrical power to the UPS, you must allow the UPS to adjust to room
temperature (20°C~25°C) for at least one hour to avoid moisture condensing inside the
UPS.
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