Delta DPS-400K - Usage Warnings

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Important Safety Instructions
4. For dual input, please install the protective devices between the UPS and the main
AC source, and also install the protective devices between the UPS and the bypass
source.
1.3 Usage Warnings
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The UPS can be used to power computers and associated peripheral devices, such as
monitors, modems, cartridge tape drives, external hard drives, etc. If you want to con-
nect inductive or capacitive loads to the UPS, it needs derating. Please contact Delta
service personnel for derating information.
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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 usage, 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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Do not put beverages on the UPS, battery cabinet or any other accessory associated
with the UPS.
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Do not open or remove the cover of the UPS to avoid high voltage electric shock. Only
authorized Delta engineers or service personnel can do so for installation or mainte-
nance. If you want to open or remove the cover, do it only under the supervision of au-
thorized Delta engineers or service personnel.
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It is strictly forbidden to connect the UPS to the following loads:
1. Regenerative loads
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If the UPS is supplied by a 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 source whose neutral is not grounded, the backfeed protective device installed as
UPS input protection must be a 4-pole type.
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The recommended electrical rating of the backfeed protective device is:
300kVA 400kVA 500kVA
690V/ 630A 690V/ 800A 690V/ 1000A
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The risk of dangerous high voltage is possible when batteries are still connected to the
UPS even though the UPS is disconnected from AC power sources. Before mainte-
nance, please turn off the external battery cabinet’s circuit breaker to cut off the battery
power from the UPS.