Usage Warnings - Delta DPS Series User Manual

5. Each protective device should have the functions of overcurrent 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).
800kVA
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
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
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*
would have sufficient time to interrupt the fault current, and the UPS's bypass will be
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.
1.3

Usage Warnings

• Before installation, wiring and working on the UPS's internal circuits, please completely
cut off all power supplying to the UPS, including the input power and battery power.
• 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. For the load suitability, please
contact Delta customer service before purchasing.
• The external slits and openings in the UPS are provided for ventilation. To ensure reliable
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.
• Before applying electrical power to the UPS, you must allow the UPS to adjust to room
temperature (20°C ~ 25°C (68°F ~ 77°F)) for at least one hour, and ensure that there is
no moisture condensing inside the unit.
• Do not put beverages on the UPS, external battery cabinet(s) or any other accessory
associated with the UPS.
100kA
1
protective devices must be more than 10 ms so that the fuses
1000kVA
100kA
9
1200kVA
100kA